Oblique Incidence Anisotropy in Ni-Fe Films Studied by Ferromagnetic Resonance

Abstract

Oblique incidence anisotropy in Ni-Fe evaporated films are investigated as a function of the substrate temperature T s is the range from 30 to 250°C. For the observation of the anisotropy, the magnetic resonance is utilized. For T s <70°C, the axis of easy magnetization is directed nearly to the incidence direction; as increasing T s , it turns to the film normal (83, 90% Ni), or to the plane of film (75% Ni). The effective saturation magnetization M * s is about 0.6 of the bulk value, then increases as increasing T s , and T s >200°C, it is almost equal to the bulk value. From the results it is concluded that the anisotropy due to the columnar grain structure K col is mainly responsible for T s <70°C, but scarcely responsible for T s >200°C. The anisotropy due to the magnetoelastic effect K magel can be distinguished from K col , and it is shown that K magel is directly corresponds to the magnetostriction constant of the film.