Magnetic structure of bilayer systems of thin films Pt/Co/ (CoO)

Effect of oxidation ferromagnet Co layer on magnetic parameters of thin polycrystalline bilayers Pt/Co/ (CoO)/Pt films have been studied. Films was obtained by magnetron sputtering. It is established that the oxidation of the cobalt layer leads to an increase in perpendicular magnetic anisotropy (PMA) in comparison with non-oxidized system also the order of oxidation layer is important. Heat treatment causes a decrease in PMA and an increase in magnetization, which is explained by interlayer diffusion and the formation of a Pt-Co alloy. Structural XRR-analysis showed that oxidation increases the thickness of the Co/CoO layer and reduces the roughness of the adjacent layers. The dependence of the coercive force and anisotropy on the oxidation sequence of the layers is found, which indicates the importance of the structural organization for controlling magnetic properties. The results demonstrate the promise of controlled oxidation in PMA tuning and exchange interaction in Pt/Co systems, which can be used in spintronic devices, including skyrmion memory and elements controlled by spin orbital momentum.