Structure and hysteresis properties of Ni/Ta nanocomposite films modified by thermomagnetic treatment

This work presents the results of a study on the crystal structure and hysteresis properties of nickel films (glass/Ni) and their layered composites (glass/Ni/Ta, glass/Ta/Ni/Ta) modified by thermomagnetic treatment. Using analysis of angular dependencies of coercive force, it has been shown that in the initial state all types of samples exhibit biaxial magnetic anisotropy, which is likely a result of the superposition of the "magnetostatic" and "magnetoelastic" mechanisms. We show that the thermomagnetic treatment can result in the formation of uniaxial or isotropic magnetic states, depending on the sample design.