Investigation of structural and hysteresis properties of oxidized permalloy films

The paper presents the results of the study of structural and hysteresis properties of permalloy films. The kinetics of oxide formation on the film surface under different oxidation conditions has been studied. New experimental data on the structure and magnetic properties of the synthesized compounds have been obtained. In permalloy films oxidized in air, it was found that as the temperature of thermomagnetic treatment increases, NiFe$_2$O$_4$ oxides and amorphous iron oxyhydroxide groups are mainly formed in the samples. As the annealing temperature is further increased, the oxides formed on the surface of permalloy films are iron oxides (predominantly $\alpha$-Fe$_2$O$_3$). The regularities of hysteresis properties change at varying annealing temperature have been determined. The conditions of formation of the exchange shift of the hysteresis loop in oxidized permalloy films have been established.