2304-9782, 2618-8686, 2405-7223 15 3.1 2022 1-259

CNF RUS 9-15 Galkin Nikolay galkin@iacp.dvo.ru Galkin Konstantin galkinkn@iacp.dvo.ru 0000-0003-4300-0070 Kropachev Oleg chernobez@gmail.com Chernev Igor igor_chernev7@mail.ru Dotsenko Sergei A. Sergei docenko@iacp.dvo.ru Goroshko Dmitrii goroshko@iacp.dvo.ru Subbotin Evgenii jons712@mail.ru Alekseev Aleksey lucky.alexey94@gmail.com Migas Dmitry migas@bsuir.by Formation, structure, and optical properties of singlephase CaSi and CaSi2 films on Si substrates In this paper, we report on optimizing the conditions for subsequently growingsingle-phase films of calcium monosilicide (CaSi) and calcium disilicide (CaSi2) on single-crystal silicon by reactive deposition epitaxy (RDE) and molecular beam epitaxy (MBE). The temperature range for the growth of CaSi films (400–500 °C) was determined, as well as the temperature range (600–680 °C) for the growth of CaSi2 films on silicon with three orientations: (111), (100) and (110). The minimum temperatures for the epitaxial growth of CaSi films by the RDE method and CaSi2 films by the MBE method were determined, amounting to, respectively, T = 475 °C and T = 640 °C. An increase in the ratio of Ca to Si deposition rates to 26 made it possible to grow a large-block CaSi2 epitaxial film with the hR6 structure by the MBE method at T = 680 °C. Raman spectra and reflection spectra from single-phase epitaxial CaSi and CaSi2 films on silicon were recorded and identified for the first time. The correspondence between the experimental reflection spectra and the theoretically calculated reflection spectra in terms of amplitude and peak positions at photon energies of 0.1–6.5 eV has been established. Single-phase CaSi and CaSi2 films retain transparency in the photon energy range 0.4–1.2 eV. 10.18721/JPM.153.101 538.9 + 535.3 CaSi films CaSi2 films silicon single-phase growth optical functions energy band structure ab initio calculations https://physmath.spbstu.ru/article/2022.58.1/ 01_15(3_1)2022_9-15.pdf

CNF RUS 16-21 Galkin Konstantin galkinkn@iacp.dvo.ru 0000-0003-4300-0070 Kropachev Oleg chernobez@gmail.com Maslov Andrei maslov@iacp.dvo.ru Chernev Igor igor_chernev7@mail.ru Subbotin Evgenii jons712@mail.ru Galkin Nikolay galkin@iacp.dvo.ru Alekseev Aleksey lucky.alexey94@gmail.com Migas Dmitry migas@bsuir.by Electronic structure and optical properties of Ca2Si films grown on silicon different oriented substrates and calculated from first principles The work considered the growth, optical properties and emerging interband transitions in Ca2Si films grown on silicon substrates with (111), (001), and (110) orientations at two temperatures (250 °C and 300 °C) using the sacrificial-template method. The optimum temperature for MBE single-phase growth of Ca2Si is 250 °C. Calculations of optical functions from the transmission and reflection spectra were carried out within the framework of a two-layer model and by the Kramers–Kronig method. It is shown that the main peaks in the experimental reflection spectra and the optical conductivity calculated according to Kramers–Kronig are in good agreement with each other. Comparison of ab initio calculations of the energy band structure and optical properties of a Ca2Si single crystal and two dimensional Ca2Si layers with experimental data in the region of high energy transitions showed good coincidence. 10.18721/JPM.153.102 538.958 Ca2 Si films silicon growth method optical functions energy band structure ab initio calculations https://physmath.spbstu.ru/article/2022.58.2/ 02_15(3_1)2022_16-21.pdf

CNF RUS 22-26 Zakhvalinskii Vasilii v_zaxval@mail.ru Borisenko Alexander borisenko02.94@mail.ru Nikulicheva Tatyana nikulicheva@bsu.edu.ru Kochura Alexey Htet Aung Pilyuk Evgeniy Properties of solid solution (Cd0.69Zn0.31)3As2 The modified Bridgeman method was used to obtain single crystals of (Cd0.69Zn0.31)3As2. It has been established that the studied sample crystallizes in space group P42/nmc with lattice parameters a = 8.78 Å, b = 12.42 Å. We have investigated the electrical conductivity in the temperature range from 10 to 300 K and in a magnetic field of 1 T, and determined the temperature dependences of the concentration and mobility of charge carriers. We have established that hopping conduction with a variable length of the Mott-type hop takes place in the temperature range from 10 to 33 K, and determined its micro parameters. 10.18721/JPM.153.103 538.9 single crystals solid solution hopping conductivity https://physmath.spbstu.ru/article/2022.58.3/ 03_15(3_1)2022_22-26.pdf

CNF RUS 27-31 Cvetkov Alexander Khanin Samuil Kumzerov YuriA. Yu.Kumzerov@mail.ioffe.ru Puchkov Nikolai muxanin@mail.ru Vladimir Vladimir solovyev_v55@mail.ru Vanin Alexander a.ivanin@mail.ru Yanikov Mikhail losthighway@mail.ru Peculiar properties of surface plasmon-polaritons excitation in metal-dielectric structures based on opals The paper reports on the study of optical phenomena peculiarities in metal-dielectric nanocomposite materials based on opal matrices caused by the excitation and propagation of surface plasmon-polaritons along the metal-dielectric interface. It is shown that two types of surface plasmon polaritons (‘bright’ and ‘dark’) can occur in the studied structures, which manifests itself in the established anomalies of light transmission and absorption. 10.18721/JPM.153.104 539.216:535.346 surface plasmon-polaritons metal-dielectric structures opals optical properties https://physmath.spbstu.ru/article/2022.58.4/ 04_15(3_1)2022_27-31.pdf

CNF RUS 32-37 Pisarenko Tatiana tata_dvo@iacp.dvo.ru Korobtsov Vladimir korobtsov.vv50@mail.ru Dimitriev Artem corrupter@mail.ru Balashev Vyacheslav balashev@dvo.ru Zheleznov Veniamin zhvv53@mail.ru Yakovlev Aleksey yakovlev@iacp.dvo.ru Giant lateral photovoltaic effect in the TiO2/SiO2/p-Si heterostructure In this work, we study the lateral photovoltaic effect in the TiO2/SiO2/p-Si structure. It was found the giant lateral photoeffect occurs in the TiO2/SiO2/p-Si heterostructure due to the high built-in barrier formation at the SiO2/p-Si interface. The maximum LPE sensitivity ~600 mV/mm is observed in the TiO2/SiO2/p-Si structure under the TiO2 film deposition for 45 min. However, the LPE nonlinearity in this structure is too large for practical applications. A decrease of the nonlinearity is achieved by the TiO2 film thickness control. The structure fabricated by the TiO2 film deposition for 50 min has the LPE sensitivity and LPE nonlinearity are 477 mV/mm and 9%, respectively, which are more suitable for optoelectronic devise. The reason for the significant values of the rise time and fall time at pulsed illumination is the impedance behaviors of the TiO2/SiO2/p-Si structure in the near-contact region. 10.18721/JPM.153.105 538.971:535.215.6 lateral photovoltaic effect heterostructure silicon titanium dioxide interface built-in barrier https://physmath.spbstu.ru/article/2022.58.5/ 05_15(3_1)2022_32-37.pdf

CNF RUS 38-43 Samardak Vadim Samardak_vy@dvfu.ru Azon Semen azon.sa@dvfu.ru Samardak Alexey samardak.aiu@dvfu.ru Papynov Evgeniy papynov.ek@dvfu.ru Samardak. Alexandder samardak.as@dvfu.ru Ognev Alexey ognev.av@dvfu.ru Effect of Co substitution on the microstructure and magnetic properties of Nd-(Fe1–x Cox )-B particles synthesized by a modified Pechini-type chemical method Magnetic Nd-(Fe, Co)-B powders prepared by a modified Pechini-type chemical method are investigated. The effect of 0–100 at.% Co concentration on magnetic properties is shown. The structure and morphology of the powders are studied by electron microscopy. The average particle size is determined by electron microscopy. The internal structure of the nanoparticle agglomerates was explored by transmission electron microscopy. The Nd2Fe14B phase was determined by spot electron diffraction. The dependence of saturation magnetization and coercive force of NdFe1–xCoxB powders on the cobalt content is investigated and discussed. An increasing coercive force is observed as a result of the increase in Co content. It is shown that the absence of phase purity leads to a decrease in the coercive force in comparison with the Nd-based hard magnetic obtained by metallurgical methods. 10.18721/JPM.153.106 537.622.4, 537.9, 54.057 NdFeCoB magnets powders Pechini method microstructure elemental analysis magnetic properties https://physmath.spbstu.ru/article/2022.58.6/ 06_15(3_1)2022_38-43.pdf

CNF RUS 44-47 Strongin Vladislav strongin.vs@dvfu.ru Nalivaiko Igor nalivaiko.in@students.dvfu.ru Chesnokov Mikhail chesnokov.ma@students.dvfu.ru Phase transitions on trimer lattices of magnetic dipoles The heat capacity in a trimerized triangular lattice was studied using the GPU-optimized Metropolis algorithm. The presence of phase transitions is discovered, the reasons for their disappearance at certain lattice parameters are explained, and frustration estimates are made for systems with different lattice parameters. 10.18721/JPM.153.107 538.9 spin ice phase transition Monte Carlo methods https://physmath.spbstu.ru/article/2022.58.7/ 07_15(3_1)2022_44-47.pdf

CNF RUS 48-53 Schegoleva Svetlana sveta170@bk.ru Titov . Pavel titov.pl@dvfu.ru Kondrikov . Nikolay kondrikov.nb@dvfu.ru Estimation of local and long-range ordering of the structure of TiO2 nanotubes We present a study of the scanning electron microscopy images of the TiO2 nanotube array. The initial and modified samples were examined before and after annealing. It has been found that the annealing of the modified and unmodified samples results in different degrees of the local ordering. The nanotubular coverings were modified by Pt nanoparticles formed by the H2PtCl6 solutions infiltration for change of their electro- and photo catalytic properties estimated by measuring the photoelectric currents. The influence of the morphology and ordering degree of the nanotubular coverings on the manifestation of their functional properties has been studied. A two-dimensional Fourier transform was applied for obtaining information on the occurrence of periodicities in the ordering of nanotubes. Correlation analysis was performed to find out the invisible regularities and periodicities in the structure of the nanotube arrays. The analysis of the photoactivity of the samples was also carried out. 10.18721/JPM.153.108 546.824-31:539.211 nanotubes titanium dioxide ordered structure https://physmath.spbstu.ru/article/2022.58.8/ 08_15(3_1)2022_48-53.pdf

CNF RUS 54-58 Kuznetsova Mariya kuznetcova.mal@students.dvfu.ru Suslin German suslin_gs@dvfu.ru Shishelov Aleksandr shishelov.af@students.dvfu.ru Yushchenko . Diana yushchenko.dol@students.dvfu.ru Ayanitov Oleg aianitov.oe@students.dvfu.ru Tarasov Egor tarasov.ev@dvfu.ru Kozlov Aleksei kozlov.ag@dvfu.ru Magnetic anisotropy and Dzyaloshinskii–Moriya interaction of Pd/Co/Ta thin films In this work, we experimentally studied the structure and magnetic properties of epitaxially grown ultrathin Pd/Co/Ta films. We have studied the effect of Ta on the structural and magnetic properties of Pd/Co epitaxial films. The deposition of a Ta layer on an epitaxial Co layer leads to a decrease in the saturation magnetization of the film due to strong magnetic disordering and the formation of a dead magnetic layer with a thickness of about 0.5 nm. Perpendicular magnetic anisotropy is observed for Co layer thicknesses less than 1.3 nm. The volume and surface components of magnetic anisotropy are determined. Additionally, the Dzyaloshinskii–Moriya interaction (DMI) is observed in epitaxial films with perpendicular magnetic anisotropy, with a DMI field value of about 30 mT. 10.18721/JPM.153.109 538.955 epitaxial thin films perpendicular magnetic anisotropy Dzyaloshinskii-Moriya interaction https://physmath.spbstu.ru/article/2022.58.9/ 09_15(3_1)2022_54-58.pdf

CNF RUS 59-64 Goroshko Dmitrii goroshko@iacp.dvo.ru Chusovitin Evgeny eliot@list.ru Dronov Alexey noiz@mail.ru Gavrilin Ilya gavrilin.ilya@gmail.com Investigation of temperature stability of germanium nanowires obtained by electrochemical deposition The effect of vacuum annealing (600 °C, 30 min) on the temperature stability against oxidation in air of germanium nanowires obtained by cathodic deposition from aqueous solutions of germanium oxide was studied by the method of photoluminescence in the visible range and Raman scattering. The stability was checked by laser annealing at temperatures above 1000 °C. It was shown that the evolution of photoluminescence and Raman peaks is associated with the formation of germanium oxide or suboxide upon laser annealing. Preliminary vacuum annealing of the sample significantly suppresses this process. The observed effect is associated with the formation of germanium oxide and the influence of indium atoms on this process. 10.18721/JPM.153.110 538.958 53.096 germanium nanowires germanium oxide photoluminescence Raman spectroscopy https://physmath.spbstu.ru/article/2022.58.10/ 10_15(3_1)2022_59-64.pdf

CNF RUS 65-70 Gnidenko Anton agnidenko@mail.ru Chigrin Pavel pal_chig@mail.ru Atomic and electronic structure of YFeO3 surface with oxygen vacancies The atomic and electronic structure of YFeO3 surfaces at the formation of oxygen vacancies are investigated by the methods of quantum-mechanical calculations. The (100), (001), and (010) surfaces are considered. The dependence of the formation energy of surface oxygen vacancy on its concentration and type of surface is shown. (100) surface oxygen vacancy has the lowest formation energy. During the formation of vacancies on the surface, the 3d states of Fe split into bulk, surface, and near-surface states. 10.18721/JPM.153.111 537.9, 544.47, 004.94 density functional theory pseudopotential method surface effects yttrium orthoferrite oxygen vacancies https://physmath.spbstu.ru/article/2022.58.11/ 11_15(3_1)2022_65-70.pdf

CNF RUS 71-75 Chesnokov Mikhail chesnokov.ma@students.dvfu.ru Nalivaiko Igor nalivaiko.in@students.dvfu.ru Strongin Vladislav strongin.vs@dvfu.ru Method for density-of-states calculation of dipole spin lattices The solution to the problem of finding the probability density of all possible states (configurations) in dipole lattices, which also allows obtaining information about the degree of frustration in the system, is considered in the article. As an example, the Cairo lattice of 40 particles (dipoles) was used - a two-dimensional system of artificial spin ice, combining the geometry of square and Kagome lattices. Our method was created by combining the approximate polynomial algorithms of the MC-walk and the Greedy algorithm. We used the Greedy algorithm to obtain the energy data points for each possible spin excess, then partition the space into an equal number of intervals, and MC-walk to accumulate the data points. It was shown that the use of intervals makes it possible to ensure good performance of the method on the most degenerate energy regions but has a problem in finding data points on the least degenerate regions. The distribution of the density of states is constructed. 10.18721/JPM.153.112 536.9 density of states Cairo lattice algorithm development ground state https://physmath.spbstu.ru/article/2022.58.12/ 12_15(3_1)2022_71-75.pdf

CNF RUS 76-81 Makarova Kseniia makarova.kv@dvfu.ru Makarov Aleksandr makarov.ag@dvfu.ru Nefedev Konstantin nefedev.kv@dvfu.ru Application of hybrid multispin Monte Carlo method to artificial dipole ice on hexagonal and Cairo lattices We apply the hybrid multispin Monte Carlo method to calculate the properties for artificial dipole ice on hexagonal and Cairo lattices. The method is based on combining a random selection of a set of spins (cluster) using the Monte Carlo with complete enumeration of all states of the selected cluster. The method works only for Ising models with a restricted radius of interaction. In addition, the method makes it possible to bring spin systems to the ground state at low temperatures. 10.18721/JPM.153.113 538.91, 537.6 hybrid Monte Carlo dipolar antiferromagnets spin ice statistical thermodynamics https://physmath.spbstu.ru/article/2022.58.13/ 13_15(3_1)2022_76-81.pdf

CNF RUS 82-86 Rybin Alexey rybin.ae@dvfu.ru Kapitan Dmitrii kapitan.diu@dvfu.ru Nefedev Konstantin nefedev.kv@dvfu.ru Makarov Aleksandr makarov.ag@dvfu.ru Kapitan Vitalii kapitan.vyu@dvfu.ru Hybrid Monte Carlo algorithm for studying the Edwards-Anderson model The complexity of the study of spin glasses is related to their frustrations, due to which classical Monte Carlo algorithms experience serious difficulties when trying to calculate such systems. The main object of research in this paper is two-dimensional Edwards–Anderson model on a square lattice. In the paper, we propose an optimized Hybrid Monte Carlo method for calculating the values of thermodynamic averages and ground state energies of the frustrated spin glass model. The validity of the results is confirmed by comparison with numerical simulation with the parallel tempering Monte Carlo method, complete enumeration algorithm and robust machine learning approach – RBM neural network. The proposed algorithm has a number of advantages: possible high parallelization of the algorithm to speed up simulation, calculation accuracy and low resource consumption, which allows to calculate lattices of relatively large size. This algorithm can be applied to calculations of lattices with different geometry and sizes. 10.18721/JPM.153.114 536.91 Edwards-Anderson model Monte Carlo algorithm ground state frustration https://physmath.spbstu.ru/article/2022.58.14/ 14_15(3_1)2022_82-86.pdf

CNF RUS 87-92 Perzhu Aleksandr perzhu_av@dvfu.ru Vasiliev Egor vasilev.eva@dvfu.ru Korol Alena korol.ao@dvfu.ru Kapitan Dmitrii kapitan.diu@dvfu.ru Rybin Alexey rybin.ae@dvfu.ru Kapitan Vitalii kapitan.vyu@dvfu.ru Application of convolutional neural networks to spin models studies Nowadays, methods and techniques of Deep Learning are being used in various scientific areas. In this paper, the applying of convolutional neural network was considered in frame of problems from statistical physics and computer simulation of magnetic films. In a frame of the first task, CNN was used to determine critical Curie point for Ising model on 2D square lattice. Obtained results were compared with classical Monte-Carlo method and exact solution. Systems of various lattice sizes and the influence of the size effect on the results’ accuracy were considered. Also, authors considered the classical two-dimensional Heisenberg model, a spin system with direct short-range exchange, and studied of its competition with the Dzyaloshinskii-Moriya interaction. A neural network was applied to the recognition of Spiral (Sp), Spiral-skyrmion (SpSk) Skyrmion (Sk), Skyrmion-ferromagnetic (SkF) and Ferromagnetic (FM) phases of the Heisenberg spin system with magnetic skyrmions. 10.18721/JPM.153.115 536.91 Convolutional neural network Metropolis algorithm Ising model Heisenberg model Magnetic Skyrmion https://physmath.spbstu.ru/article/2022.58.15/ 15_15(3_1)2022_87-92.pdf

CNF RUS 93-100 Volovlikova Olga 5ilova87@gmail.com Silakov Gennady mr.komrad-13@ya.ru Gavrilov Sergey pcfme@miee.ru Lazorkina Elena lena.lazorkina.00@mail.ru Morphology evolution of mesoporous silicon powder formed by Pd-assisted chemical etching at temperatures of 25 – 75 °C In this paper, we report the preparation of porous silicon powder by two-step Pd-assisted chemical etching with metallurgical grade polycrystalline silicon powder by varying the etching time from 30 to 90 minutes and solution temperature from 25 °C to 75 °C with and without thermal stabilization. A rapid temperature increase is observed with a maximum value of 95 – 100 °C in the case of etching without thermal stabilization. A high etching time of 90 minutes and a dissolution temperature above 50 °C have a negative effect on the formation of porous particles, which leads to the complete dissolution of silicon particles. The slow temperature growth for all initial temperatures in the case of the etching with thermal stabilization is observed. We established the positive effect of thermal stabilization in the process of etching on the thickness of the pores walls, reducing the uncontrollably growing rate of silicon etching, as a result, overetching of silicon. 10.18721/JPM.153.116 539.23 539.216.1 porous silicon powder MACE crystal size Raman spectroscopy thermal stabilization temperature-time dependencies https://physmath.spbstu.ru/article/2022.58.16/ 16_15(3_1)2022_93-100.pdf

CNF RUS 101-106 Dudin Andrey andrew.n.dudin@gmail.com Iurina Viktoria viktoriay-09@mail.ru Neshchimenko Vitaly v1ta1y@mail.ru Li Chundong lichundong@hit.edu.cn Radiation induced defects of zinc oxide particles with star and flower shapes The paper presents the results of modeling a proton beam with energies of 100 keV on zinc oxide particles, with star and flower shapes, in the Geant4 software package. A high ability to accumulate primary defects was demonstrated for star-type particles in comparison with flower-type particles. A comparative analysis of the calculated data on the study of defects as a result of modeling with experimental data is carried out. 10.18721/JPM.153.117 535.34:004.942 zinc oxide flower-shaped particles star-shaped particles degradation radiation resistance defects protons irradiation https://physmath.spbstu.ru/article/2022.58.17/ 17_15(3_1)2022_101-106.pdf

CNF RUS 107-112 Ryzhkova Maria lavric@iacp.dvo.ru Tsukanov Dmitry tsukanov@iacp.dvo.ru Structures and electrical conductance at the initial stages of magnesium growth on Si(111)-Pb surface In the present work, we have studied the growth of Mg ultrathin films on the Si(111) surface modified by Pb reconstructions using low-energy electron diffraction and the four-point-probe method. The new binary surface reconstructions √7×√7-(Mg, Pb) and √19×√3- (Mg, Pb) have been observed for the first time. The growth of magnesium layers depends both on the structure of Pb-induced surface reconstruction and on the Mg deposition manner. It is assumed that inclusion of magnesium atoms in the √7×√7 surface structure stabilizes the growth of Mg film which is independent of the manner of deposition in this case. We have investigated surface electrical conductance after the formation of magnesium layers at room temperature until about 9 monolayers of Mg coverage. In addition to the magnesium film Mg(0001), the highest electrical conductance among the presented surface structures has been detected for the Si(111)-6×6-(Pb, Mg) surface phase that consists of the maximum number of metal atoms, both lead and magnesium. 10.18721/JPM.153.118 538.911; 537.311.33 silicon electrical conductance surface structures metal films low-energy electron diffraction https://physmath.spbstu.ru/article/2022.58.18/ 18_15(3_1)2022_107-112.pdf

CNF RUS 113-118 Sobirov Mukhammad sobirov.mi@dvfu.ru Samardak Alexey samardak.aiu@dvfu.ru Potapova Sofia potapova.sr@students.dvfu.ru Karibov Muslim karibov.mb@students.dvfu.ru Rogachev Kirill rogachev.ka@dvfu.ru Ognev Alexey ognev.av@dvfu.ru Samardak. Alexandder samardak.as@dvfu.ru FORC-investigation of magnetic properties of Ni nanowire arrays synthesized using Al2O3 templates with different order of pores This paper focuses on the investigation of magnetic properties of Ni nanowire arrays synthesized using Al2O3 porous templates with different durations of first anodization. It has been shown that the diameter of the pores in the template is increasing with an increase in the first anodization time up to 2 hours, and the interpore distance becomes more uniform. Using porous templates with short times of anodization results in synthesis of branched Ni nanowires, while templates with longer times allow to achieve cylindrical nanostructures. Magnetic properties of Ni nanowires arrays were studied using the FORC method, which allowed to investigate the distribution of interaction fields and coercive forces in the arrays. It was found that two magnetic phases with different coercive forces and interaction field are observed in the samples with a short duration of first anodization. 10.18721/JPM.153.119 538.955 и 538.975 anodization aluminum oxide matrices nanowires electrochemical deposition FORC-method https://physmath.spbstu.ru/article/2022.58.19/ 19_15(3_1)2022_113-118.pdf

CNF RUS 119-124 Overchenko Aleksei alexsey7840@mail.ru Dubkov Sergey sv.dubkov@gmail.com Novikov Denis tororo@bk.ru Kolmogorov Vasilii vskolmogorov@gmail.com Volkova Lidiya lidiya.volkova.96@mail.ru Grishin Timofey grishin.t@outlook.com Edelbekova Polina polinaedel51@gmail.com Fabrication of SERS-sensitive nanopipette with silver nanoparticles obtained by vacuum thermal evaporation This work is concerned with developing an approach to producing an array of plasmonic Ag nanoparticles on the nanopipette surface. The vacuum thermal evaporation method followed by annealing was used to form the nanoparticle array. The surface morphology of the modified pipettes was investigated by scanning electron microscopy. Based on the SEM images obtained, the most efficient method for particle deposition on the pipette was selected. It was found that two-stage depositions on the horizontally mounted pipette formed an array of silver nanoparticles with a size of about 16 nm. The obtained modified nanopipettes were investigated by Raman spectroscopy. A laser with a wavelength of 532 nm was used to obtain the spectra. Rhodamine in the R6G modification was used as an analytical substance. The enhance factor of the modified pipette was calculated by comparing it with pure glass at the same power values of the laser and concentration of the analytical substance, rhodamine R6G. The developed approach to modifying the surface of nanopipettes allows fabricating SERS pipettes for monitoring various intracellular biomarkers. 10.18721/JPM.153.120 539.234 nanopipette SERS Ag-particles Raman spectroscopy https://physmath.spbstu.ru/article/2022.58.20/ 20_15(3_1)2022_119-124.pdf

CNF RUS 125-130 Tarasov Andrey bloggger4@gmail.com Dubkov Sergey sv.dubkov@gmail.com Gromov Dmitry gormadima@gmail.com Ryazanov Roman r.m.ryazanov@gmail.com Volkova Lidiya lidiya.volkova.96@mail.ru Facile fabrication of a TiO2 NW-based glucose sensor by direct ink writing This paper presents the results of facile fabrication of a non-enzymatic glucose sensor by forming a sensing element based on TiO2 nanofilaments using direct ink writing (DIW). The glucose concentration in the solution was determined by changing the resistance of the TiO2 layer. Nanowires (NW) were obtained by hydrothermal synthesis in 10 M sodium alkali solution followed by heat treatment. The surface morphology of obtained samples was studied using scanning electron microscopy. The formation of a sensitive layer was carried out on a 3D printer with a specially designed print head from a suspension based on an aqueous solution of polyvinyl alcohol (PVA) followed by heat treatment in air. The suspension was analyzed for viscosity and contact angle. The sensitive layers were formed on a silicon substrate with a SiO2 surface oxide layer and gold contacts. Layers of TiO2 NW were formed between the contacts. The sensitivity of the sensor to glucose solutions of various concentrations was studied. As a result of the studies, the studied structures showed sensitivity to a glucose solution in the range from 1 to 100 mmol. 10.18721/JPM.153.121 538.9 TiO2 nanowires hydrothermal synthesis glucose sensor https://physmath.spbstu.ru/article/2022.58.21/ 21_15(3_1)2022_125-130.pdf

CNF RUS 131-136 Plyusnin Nikolay plusnin@dvo.ru Usachev Pavel usachev@mail.ioffe.ru Pavlov Viktor pavlov@mail.ioffe.ru Effect of thickness and annealing of the Si(001)2×1-Cu wetting layer on the morphology of layered nanofilms based on Fe, Co, and Cu and their ferromagnetic properties Layered nanofilms based on Fe, Co, and Cu were grown on Si(001)2×1-Cu wetting layers with thicknesses of 1 and 2 ML and studied using the AES, EELS, and LEED methods in an ultrahigh vacuum chamber. After unloading into air, the samples were studied by AFM and MOKE methods. It was found that an increase in the thickness and annealing of the Si(001)2×1-Cu wetting layer increase the agglomeration of nanofilms and, as a consequence, their magnetization and coercive force. Although, annealing the Cu wetting layer reduces the degree of squareness of the magnetic hysteresis loop. 10.18721/JPM.153.122 539.216 multilayer films wetting layer growth agglomeration morphology metals silicon substrate hysteresis loop atomic force microscopy magneto-optical Kerr effect https://physmath.spbstu.ru/article/2022.58.22/ 22_15(3_1)2022_131-136.pdf

CNF RUS 137-142 Yan Dmitriy dmitry_yan@mail.ru Galkin Nikolay galkin@iacp.dvo.ru Galkin Konstantin galkinkn@iacp.dvo.ru Nepomnyashchiy Aleksandr santila001@mail.ru Influence of current density, anodization time, and illumination on the thickness of porous silicon in wafers with the built-in p–n junction and its photoluminescence The formation of a porous silicon (por-Si) layer in a thin p-type layer epitaxially grown on n-type silicon, at two anodizing current densities and different anodizing times is studied and a comparison is made of transverse cleavages, surface morphology, reflection spectra, and photoluminescence spectra. The minimum duration of anodizing (15 and 10 minutes) at current densities of 10 mA/cm2 and 20 mA/cm2, at which a single-layer PS structure is formed, is established. With an increase in the anodization time, regardless of the current density, a two-layer structure is formed with an internal tree-like porous silicon layer, whose contribution to photoluminescence is minimal, and the reflection coefficient drops strongly due to irretrievable losses in the porous tree-like layer. 10.18721/JPM.153.123 621.382 + 537.312.52 + 535.215.4 silicon built-in p–n junction current density anodization time illumination porosity https://physmath.spbstu.ru/article/2022.58.23/ 23_15(3_1)2022_137-142.pdf

CNF RUS 143-148 Yan Dmitriy dmitry_yan@mail.ru Galkin Nikolay galkin@iacp.dvo.ru Galkin Konstantin galkinkn@iacp.dvo.ru Chernev Igor igor_chernev7@mail.ru Сurrent-voltage characteristics and photoelectric properties of por-Si/Si-p/Si-n diodes with different porous layer thickness In this work, the current-voltage and photoelectric spectral characteristics of double heterodiodes por-Si/Si-p/Si-n and a reference diode with a p–n junction at room temperature are analyzed and compared with data on the thickness of porous silicon layers and photoluminescence spectra for the synthesized heterostructures. It is shown that photospectral sensitivity in the region of 400–800 nm is exhibited by diodes with a single-layer structure of porous silicon whose thickness does not exceed 2 µm. In this case, the amplitude of the spectral photoresponse decreases with a decrease in the thickness of the porous layer. As for diodes with a two-layer structure of porous silicon (ordinary porous and tree-like porous) and thicknesses from 4.5 µm to 17.4 µm, currents do not flow due to rapid oxidation of such structures. A band energy diagram of a double heterodiode with a layer of porous silicon is proposed based on the experimental data. 10.18721/JPM.153.124 621.382 + 537.312.52 + 535.215.4 Silicon built-in p–n junction illumination porous layer thickness tree-like porous structure double heterodiode current blocking photoresponse spectra diode band diagram https://physmath.spbstu.ru/article/2022.58.24/ 24_15(3_1)2022_143-148.pdf

CNF RUS 149-154 Chekadanov Alexander alexch17@mail.ru Pugachevskii Maxim pmaximal@mail.ru Aung Hein Kyaw kyawaunghein53@gmail.com Kuzmenko Alexander apk3527@mail.ru Storozhenko Anastasia storogenko_s@mail.ru Effect of thermal annealing on grain size and phase changes in magnetron titanium oxide films Thin TiO2 films were produced on single-crystal Si-wafers by magnetron sputtering. Subsequently, they were annealed in air at different temperatures. We researched the structure, the phase composition, the morphology, and the dimensional characteristics of the films before and after annealing using X-ray diffraction, energy-dispersive and spectrophotometric analysis, scanning electron microscopy, and small-angle X-ray scattering. The analysis of the influence of annealing parameters on the characteristics of TiO2 films is carried out. The technique for determining the qualitative and quantitative phase composition of TiO2 during its polymorphic transformations at high temperature heating has been developed. It was found that TiO2 annealing at 400 ºC leads to crystallization of the anatase phase, and annealing at 600 ºC leads to transformations into the rutile phase. The optical band gap decreases with increasing temperature and with increasing annealing time. 10.18721/JPM.153.125 538.91 titanium dioxide annealing phase composition morphology polymorphic transformation SEM SAXS https://physmath.spbstu.ru/article/2022.58.25/ 25_15(3_1)2022_149-154.pdf

UNK RUS 155-161 Frolov Anatoly froloff5@yandex.ru Pisarenko Tatiana tata_dvo@iacp.dvo.ru Kraynova Galina kraynova.gs@dvfu.ru Ilin Nikita ilin.nva@dvfu.ru Ilin Nikita ralin.ayu@dvfu.ru Effect of high-speed nonequilibrium on morphological and magnetic properties of melt-spun Co58Ni10Fe5Si11B16 alloy The work presents a study on the influence of high-speed nonequilibrium of the meltspinning process on the morphological and magnetic properties of the amorphous Co58Ni10Fe5 Si11B16 alloy. It is shown that the amorphous states with a different extent of disordering may be produced by varying the melt-spinning conditions. A correlation has been established between the fractal structure of morphological inhomogeneities and the magnetic properties of the melt-spun alloy: the higher the fractal dimension of the hierarchical mesoscale structure, the more the soft magnetic alloy. The optimal ordering of both the morphological and magnetic structure of the melt-spun Co58Ni10Fe5Si11B16 alloy is achieved at a cooling roller speed of 28 m/s. 10.18721/JPM.153.126 539.213.2:539.25 melt-spun alloy morphology mesoscale defects fractal dimension magnetism coercitivity https://physmath.spbstu.ru/article/2022.58.26/ 26_15(3_1)2022_155-161.pdf

UNK RUS 162-167 Ilin Nikita ralin.ayu@dvfu.ru Kharitonskii Petr peterkh@yandex.ru Zolotov Nikita nikita13300@yandex.ru Gareev Kamil kggareev@yandex.ru Anikieva Yulia y.anikieva111@gmail.com Micromagnetic modeling of the superparamagnetic fraction of Fe3O4–Fe3–x Tix O4 composites Modeling of the hysteresis characteristics of Fe3O4–Fe3–xTixO4 composites was performed using the method of magnetic rectangles. Their magnetic properties are well explained within the model of an ensemble of magnetostatically interacting two-phase chemically inhomogeneous particles. It is shown that accounting for the contribution of the superparamagnetic fraction makes it possible to obtain agreement between the theoretical and experimental magnetic characteristics of the samples. The model allows calculating the magnetization reversal fields and magnetizations of the studied composites theoretically and also to show that the main contribution to the remanent magnetization is made by two phase particles. In addition, a possibility of using this model for samples containing superparamagnetic particles is demonstrated. 10.18721/JPM.153.127 537.622, 537.624 magnetic granulometry superparamagnetism micromagnetic modeling magnetostatic interaction two-phase particles https://physmath.spbstu.ru/article/2022.58.27/ 27_15(3_1)2022_162-167.pdf

CNF RUS 168-172 Imshinetskiy Igor igorimshin@gmail.com Kashepa Viktoriia sobranie72pepper@gmail.com Nadaraia Konstantine nadaraiakv@mail.ru Mashtalyar Dmitry madiva@inbox.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Influence of halloysite nanotube incorporation on the properties of PEO-coatings formed on MA8 magnesium alloy The properties of the coatings formed on the MA8 magnesium alloy by plasma electrolytic oxidation in electrolytes containing halloysite nanotubes in the concentrations of 0, 10, 20, 30 and 40 g/l were investigated. It has been found that the presence of halloysite nanotubes in the composition of the coatings has a positive impact on protective properties of the coatings and leads to the increase of roughness and heterogeneity. Obtained coatings reduce corrosion current density in comparison with the base PEO layers. 10.18721/JPM.153.128 620.197:621.388 plasma electrolytic oxidation nanoparticles halloysite nanotubes protective coatings https://physmath.spbstu.ru/article/2022.58.28/ 28_15(3_1)2022_168-172.pdf

CNF RUS 173-178 Kononenko Yana kononenko.yai@gmail.com Gnedenkov Andrey asg17@mail.com Sinebryukhov Sergey sls@ich.dvo.ru Filonina Valeria filonina.vs@gmail.com Vyaliy Igor vyaly@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Composite triazole-containing PEO-coatings for effective corrosion protection of AlMg3 aluminum alloy The study considers composite coatings formed on the AlMg3 aluminum alloy, consisting of PEO-coatings impregnated with corrosion inhibitors, 1,2,4-triazole and benzotriazole, in various concentrations. The morphology and composition of the resulting coatings were studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The increase in the protective properties of composite coatings was studied by electrochemical impedance spectroscopy (EIS). SEM-images showed that the coatings have a self-assembled microtubular structure with a tube diameter varying from 300 to 500 nm and average tube height of 9 µm. EIS results showed that samples with composite inhibitor containing PEO-coatings have better protective properties compared to pure aluminum alloy and base PEO-layer. An increase in the concentration of inhibitors of the triazole group from 0.05 M to 0.1 M during impregnation into a PEO-coating leads to a decrease in the corrosion resistance of the samples with composite coatings. 10.18721/JPM.153.129 544.63:620.197.3 Anti-corrosion composite coating aluminum alloy PEO coating micro-tubular structure corrosion inhibitor https://physmath.spbstu.ru/article/2022.58.29/ 29_15(3_1)2022_173-178.pdf

CNF RUS 179-184 Bessolov Vasily bes@triat.ioffe.ru Konenkova Elena lena@triat.ioffe.ru Rodin Sergey s_rodin77@mail.ru Semipolar GaN layers on nanostructured silicon: technology and properties This paper proposes a method for synthesis of hexagonal GaN on Si(100) and Si(113) substrates, where nanostructures with an element size less than 100 nm are formed on the surface. It has been established that the method of gas-phase epitaxy from metalorganic compounds in a hydrogen atmosphere on such substrates makes it possible to form semipolar layers of GaN(10-11) and GaN(11-22) with a minimum half-width of the X-ray diffraction swing curve of about 30 arcmin. It is shown that during the formation of a semipolar AlN layer at the initial stage of epitaxy, a corrugated surface is formed on NP-Si(100) from the semipolar planes AlN(10-11) and AlN(10-1-1) with counter-directional c axes. Then, during the growth of the GaN layer, a transition is made from the symmetrical state of the semipolar GaN(10-11) and GaN(10-1-1) planes to an asymmetric state with the orientation of the c axis of the GaN(10-11) layer. That transition is apparently determined by the difference in the values of the surface energy of GaN during epitaxy on the corrugated surface. 10.18721/JPM.153.130 548.528 semipolar gallium nitride nano-patterned Si substrate surface energy https://physmath.spbstu.ru/article/2022.58.30/ 30_15(3_1)2022_179-184.pdf

CNF RUS 185-190 Pleshkova Arina othariadna@gmail.com Piatkova Maria piatkova.mariia.al@gmail.com Nadaraia Konstantine nadaraiakv@mail.ru Podgorbunsky Anatoly defrag_2008@mail.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Influence of phenol red in Earle’s solution on corrosion properties of coated and uncoated Mg alloy Metallic biomaterials are widely used for clinical purposes due to their excellent mechanical properties and good biocompatibility. Inspired by the functional surface of natural biological systems, many new designs and concepts have recently emerged to create multifunctional surfaces with great potential for biomedical applications. In present study, bioactive coatings were formed on Mg alloy by plasma electrolytic oxidation (PEO). Morphological features and composition of formed layers were studied by SEM and EDS. It was revealed that PEOcoatings have in their composition Ca and P, which can increase biocompatibility. Moreover, obtained coatings demonstrated high corrosion properties: corrosion current density substantially decreased compared to bare alloy. 10.18721/JPM.153.131 544 metallic biomaterials bioactive coatings plasma electrolytic oxidation https://physmath.spbstu.ru/article/2022.58.31/ 31_15(3_1)2022_185-190.pdf

CNF RUS 191-196 Suchkov Sergey snsuchkov@yandex.ru Nadaraia Konstantine nadaraiakv@mail.ru Imshinetskiy Igor igorimshin@gmail.com Mashtalyar Dmitry madiva@inbox.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Evaluation of surface free energy of bioactive coatings in titanium and magnesium alloy Surface free energy (SFE) is a crucial parameter for predicting the cell adhesion and proliferation on implantation materials. In this work, the influence of bioactive calciumphosphate coatings on the SFE of titanium and magnesium implants was studied. Results shows that the formation of bioactive coatings increase SFE by 139 % for magnesium alloy and 38 % for titanium, which in turn should have a positive effect on the adhesion and proliferation of osteoblasts. 10.18721/JPM.153.132 544.722.3 titanium magnesium alloy plasma electrolytic oxidation biocompatibility surface free energy https://physmath.spbstu.ru/article/2022.58.32/ 32_15(3_1)2022_191-196.pdf

CNF RUS 197-203 Nomerovskii Aleksei nomerovskii.ad@outlook.com Gnedenkov Andrey asg17@mail.com Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Preparation of layered double hydroxide on PEO-coated MA8 magnesium alloy: electrochemical and corrosion properties The coating containing a layered double hydroxide (LDH) was obtained on the MA8 magnesium alloy. The coating morphology, its electrochemical and corrosion behavior were studied. Scanning electron microscopy confirmed the lamellar structure of the LDH. Maps of the element distribution on the surface (the aluminum content on the surface is 3.2 wt.%) and the diffraction pattern of the sample (the presence of a hydrotalcite phase) also confirmed the presence of LDH. The electrochemical and corrosion behavior of the base PEO-coating, an LDH-containing coating, and the LDH-containing coating after impregnation with sodium oleate was compared. According to the experimental data analysis the positive role of LDH in the protection of the magnesium alloy was established. Treatment of the LDH-containing coating with a 0.1 M solution of sodium oleate makes it possible to increase the impedance modulus measured at the frequency of 0.1 Hz by order of magnitude compared to the inhibitor free protective layer. The obtained LDHs have a positive effect on the stability of the protective properties in aggressive medium, which was shown by the decrease in corrosion current density for the investigated sample. 10.18721/JPM.153.133 544.6.018.2+546.46 magnesium alloys layered double hydroxide electrochemistry corrosion inhibition plasma electrolytic oxidation https://physmath.spbstu.ru/article/2022.58.33/ 33_15(3_1)2022_197-203.pdf

CNF RUS 204-209 Belov Evgeny belov_eal@mail.ru Nadaraia Konstantine nadaraiakv@mail.ru Mashtalyar Dmitry madiva@inbox.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Anti-icing composite fluoropolymer coatings on titanium Developing anti-icing coatings is an important topic for many scientists. In this work, we describe composite coatings prepared by a combination of plasma electrolytic oxidation and deposition of polytetrafluoroethylene from suspension. The composite layers obtained had high strength and adhesion to metal, which made it possible to use them in extreme environmental conditions. The change in the adhesion strength of ice to the coating surface was considered with various methods for forming composite layers on the surface of the metal and compared with the base PEO layer. The wettability of the resulting coatings as well as the relationship between the contact angle and the ice adhesion strength were evaluated. 10.18721/JPM.153.134 667.6 titanium anti-icing coatings protective coatings composite coatings plasma electrolytic oxidation F4-d superdispersed polytetrafluoroethylene https://physmath.spbstu.ru/article/2022.58.34/ 34_15(3_1)2022_204-209.pdf

CNF RUS 210-214 Izotov Nikolai nikolaj.izotov@mail.ru Egorkin Vladimir egorkin@ich.dvo.ru Kharchenko Ulyana ulyana-kchar@mail.ru Vyaliy Igor vyaly@ich.dvo.ru Minaev Alexander minaev.an@dvfu.ru Sinebryukhov Sergey sls@ich.dvo.ru Influence of SPTFE on corrosion behavior of composite coatings during salt-spray test Plasma electrolytic oxidation has been used to create a sublayer on aluminum alloy to form a composite coating to improve the corrosion properties of the processed material. The evolution of protective characteristics of the resulting coatings were examined by potentiodynamic polarization during the exposure in a salt spray chamber. The absence of pittings after a 10-day test for the entire series of composite coatings on aluminum alloy confirms the high level of barrier properties of the coated samples. 10.18721/JPM.153.135 667.637.2, 667.613, 620.199 plasma electrolytic oxidation (PEO) composite coating (CC) potentiodynamic polarization salt spray testing https://physmath.spbstu.ru/article/2022.58.35/ 35_15(3_1)2022_210-214.pdf

CNF RUS 215-221 Sidorova Marina sidorova-01-02@rambler.ru Podgorbunsky Anatoly defrag_2008@mail.ru Gerasimenko Maria gerasimenko.ms00@mail.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Composition and morphology of calcium phosphate coatings formed on resorbable substrates based on pure Mg and Mg-HAp composite We considered coatings obtained on a magnesium based substrate with a different content of a bioactive component, nanosized hydroxyapatite (HAp). The properties of coatings formed by plasma electrolytic oxidation (PEO) in electrolytes containing calcium compounds were compared. Coatings obtained in the electrolyte with HAp demonstrated higher strength characteristics compared to coatings obtained in the glycerophosphate electrolyte. It can be explained by the hardness of the components included in the coating (Mg2SiO4) as well as by the presence of hydroxyapatite nanoparticles. Oxidation of composite samples in an electrolyte with HAp leads to a decrease in the corrosion current density by 2 orders of magnitude compared to this parameter for uncoated samples. 10.18721/JPM.153.136 544.63 bioresorbable composite magnesium hydroxyapatite PEO adhesion https://physmath.spbstu.ru/article/2022.58.36/ 36_15(3_1)2022_215-221.pdf

CNF RUS 222-226 Dronova Daria demetpatakai@gmail.com Gavrilov Sergey pcfme@miee.ru Dronov Alexey noiz@mail.ru Investigation of changes in the composition of anodic TiO2 nanotubes at different stages of formation by AES and TOF SIMS methods The article presents comprehensive studies of the chemical composition and morphology of nanotubular anodic TiO2 layers at the first stages of the porous structure nucleation, by scanning electron microscopy (SEM), Auger spectroscopy (AES), time-of-flight secondary ion mass spectrometry (TOF.SIMS). Our goal was to show the profile distribution of chemical elements and reaction products at each of the initial stages of the anodic oxide growth in the ethylene glycol-based electrolyte containing fluoride, which will help expand the understanding of pore formation mechanism. 10.18721/JPM.153.137 538.9 TiO2 nanotubes anodization AES TOF.SIMS https://physmath.spbstu.ru/article/2022.58.37/ 37_15(3_1)2022_222-226.pdf

CNF RUS 227-231 Filonina Valeria filonina.vs@gmail.com Gnedenkov Andrey asg17@mail.com Sinebryukhov Sergey sls@ich.dvo.ru Minaev Alexander minaev.an@dvfu.ru In vitro corrosion behavior of bioresorbable Mg-Ca alloy with hydroxyapatite-containing protective coating The paper presents the results of the study of corrosion performance of HApcontaining coating obtained on the Mg-0.8Ca bioresorbable magnesium alloy using plasma electrolytic oxidation (PEO). Electrochemical measurements were carried out in minimal essential medium (MEM) using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) and monitoring of open circuit potential (OCP) techniques. It was established that the PEO treatment of Mg-0.8Ca leads to a significant increase in corrosion resistance of the material. Formation of heterooxide layer on magnesium alloy contributes to a decrease in corrosion current density (IC) more than three times. The impedance modulus measured at low frequency (|Z|f=0.1 Hz) for a coated material increased by two times compared to an uncoated one. 10.18721/JPM.153.138 620.193:544.653 Magnesium magnesium alloys corrosion protection plasma electrolytic oxidation (PEO) hydroxyapatite https://physmath.spbstu.ru/article/2022.58.38/ 38_15(3_1)2022_227-231.pdf

RAR RUS 232-236 Martynova Irina Irisha-windsurfer@yandex.ru Gavrilin Ilya gavrilin.ilya@gmail.com Effect of thermal annealing on the composition of Ge-Co nanostructure obtained by electrochemical deposition Сobalt-based catalysts are one of the possible candidates for catalysts that accelerate the decomposition of water to produce energy. In this work, the one-dimension GeCo nanostructures have been prepared by electrochemical deposition in a three-electrode cell. The samples have been annealed in atmosphere at various temperature (300 ºC, 450 ºC, 600 ºC). Effect of thermal annealing on the composition of Ge-Co nanostructure has been studied. The morphology of the obtained Ge-Co nanostructures has been investigated using scanning electron microscopy The method of X-ray diffraction analysis has been used to investigate composition changes of Ge-Co. Diffractograms show the presence of Co2GeO4 catalyst at an annealing temperature of 600 ºC. The sample with this annealing temperature shows the best properties as oxygen evolution catalyst. 10.18721/JPM.153.139 544.6 Ge-Co nanostructures oxygen evolution catalyst Ge nanowires electrochemical deposition https://physmath.spbstu.ru/article/2022.58.39/ 39_15(3_1)2022_232-236.pdf

CNF RUS 237-242 Kolchin Aleksandr avkolchin@physics.msu.ru Zabotnov Stanislav zabotnov@physics.msu.ru Shuleiko Dmitrii shuleyko.dmitriy@physics.msu.ru Presnov Denis denis.presnov@phys.msu.ru Fedyanina Maria mfh.miet@gmail.com Kuzmin Evgenii e.kuzmin@lebedev.ru Kashkarov Pavel kashkarov@physics.msu.ru Laser-induced periodic surface structures formation and reversible crystallization in amorphous Ge2Sb2Te5 thin films as a result of femtosecond irradiation Femtosecond laser structuring opens for chalcogenide semiconductor Ge2Sb2Te5 new perspectives in photonics applications due to wide change of its structural and optical properties in such processing. We studied laser-induced modification of amorphous Ge2Sb2Te5 thin films on silicon substrates. The investigations show that periodic relief formation is accompanied by phase transitions to the fcc crystalline phase and back. Furthermore, the irradiated Ge2Sb2Te5 samples demonstrate optical transparency in the near infrared region. The examined structures are interesting for further studies as a base of new memory devices which may possess optical anisotropy and be integrated into fiber optics applications. 10.18721/JPM.153.140 544.6 Ge2 Sb2 Te5 femtosecond laser processing laser-induced periodic surface structures reversible phase transitions https://physmath.spbstu.ru/article/2022.58.40/ 40_15(3_1)2022_237-242.pdf

CNF RUS 243-247 Novikov Denis tororo@bk.ru Latipov Egor la_019@mail.ru Dubkov Sergey sv.dubkov@gmail.com Savitskiy Andrey andr.savitskiy@gmail.com Bandarenka Hanna h.bandarenka@gmail.com Bestavashvili Afina afinabestavashvili@gmail.com Kopylov Philip kopylov_f_yu@staff.sechenov.ru Gromov Dmitry gormadima@gmail.com Development of a technique for studying trimethylamine oxide solutions using planar SERS structures This work is devoted to revealing the parameters of preparing SERS substrates for studying a low concentration trimethylamine oxide (TMAO) solution by Raman spectroscopy. A study was made of the effect of treatment with a 3,5% HCl solution, deionized water, and isopropanol vapor of planar surface enhance Raman spectroscopy (SERS) structures on the resulting Raman spectra of TMAO. We used a SERS substrate representing a multilayer structure: a mirror silver layer, a thin dielectric SiO2 insulating layer, and an array of plasmonic Ag nanoparticles about 25 nm in size. The influence of the duration of the substrate soaking in the analyte solution on the quality of the Raman spectra was established. Raman studies of SERS substrates with TMAO were carried out using 532 and 785 nm lasers. 10.18721/JPM.153.141 543.421/.424 nanoparticles silver trimethylamine oxide SERS https://physmath.spbstu.ru/article/2022.58.41/ 41_15(3_1)2022_243-247.pdf

CNF RUS 248-252 Vyaliy Igor vyaly@ich.dvo.ru Egorkin Vladimir egorkin@ich.dvo.ru Izotov Nikolai nikolaj.izotov@mail.ru Kharchenko Ulyana ulyana-kchar@mail.ru Minaev Alexander minaev.an@dvfu.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Evolution of tribological properties of the composite coatings on AMG3 aluminum alloy during the atmospheric exposure The paper presents the results of an evaluation of the tribological characteristics of samples with composite coatings during 12 months of atmospheric corrosion. Composite coatings were obtained by treating oxide layer formed by plasma electrolytic oxidation (PEO) with fluoropolymers: superdispersed polytetrafluoroethylene (SPTFE) or polyvinylidene fluoride (PVDF), as well as a suspension of SPTFE in PVDF. It was found that the composite coatings formed in suspension with a ratio of PVDF to SPTFE 1:5 demonstrate the best tribological performance among the studied samples and characterizes by initial coefficient of friction 0.006–0.010. It is shown that samples with composite coatings have 1–1.5 orders of magnitude lower wear rate (9.7∙10⁻5–4.4∙10⁻4 mm3/(N·m)), in comparison with the PEO-treated sample (3.9·10⁻3 mm3/(N·m)). 10.18721/JPM.153.142 539.232+620.178.16 aluminum protective coating plasma electrolytic oxidation composite coating tribology https://physmath.spbstu.ru/article/2022.58.42/ 42_15(3_1)2022_248-252.pdf

CNF RUS 253-258 Vyaliy Igor vyaly@ich.dvo.ru Egorkin Vladimir egorkin@ich.dvo.ru Izotov Nikolai nikolaj.izotov@mail.ru Kharchenko Ulyana ulyana-kchar@mail.ru Minaev Alexander minaev.an@dvfu.ru Sinebryukhov Sergey sls@ich.dvo.ru Gnedenkov Sergey svg21@hotmail.com Changes in barrier properties of protective composite coatings on aluminum alloy during climatic testing The paper reveals the changes in corrosion properties of the samples with composite coating subjected to atmospheric corrosion test for 6 months. Composite coating (CC) was formed by treatment of oxide layer obtained by plasma electrolytic oxidation (PEO) with suspension of superdispersed polytetrafluoroethylene microparticles (SPTFE) in polyvinylidenefluoride (PVDF). The corrosion current density was compared for the composite coatings, PEO-coated and untreated samples. It is shown that corrosion current density for the sample with СC tested for 6 months (2.9·10–11 A·cm–2) is more than 3 orders of magnitude lower in comparison with the sample with PEO-layer (3.5·10–8 A·cm–2) and almost 6 orders of magnitude less than for uncoated aluminium alloy (1.7·10–5 A·cm–2). 10.18721/JPM.153.143 539.232+620.193.75 aluminum protective coating plasma electrolytic oxidation composite coating electrochemistry https://physmath.spbstu.ru/article/2022.58.43/ 43_15(3_1)2022_253-258.pdf