Inhomogeneity in the Magnitude of the Anisotropy Field in Thin Nickel‐Iron Films

摘要

The inhomogeneity in the magnitude of the anisotropy field of vacuum‐deposited nickel‐iron films has been measured as a function of film composition, inhomogeneity in composition, substrate temperature, time interval of deposition, and diameter of the film. The part of the inhomogeneity in the magnitude of Hk due to the product of the magnetostriction and the nonisotropic strain is found to be twice the part of the inhomogeneity in the direction of Hk due to this cause, as predicted by Crowther. Part of the inhomogeneity in magnitude but not in direction of Hk is attributed to nonuniformity in substrate temperature, and part to magnetocrystalline anisotropy.