Anisotropy Field Measurements on Ni-Fe Thin Films

Abstract

Rotation anisotropy fields have been determined in vacuum deposited Permalloy films using pulsed external fields. The signal producing field is applied at right angles to the direction of easy magnetization, while the effective reset field is applied at a variable acute angle to the direction of easy magnetization. A special type of permeability curve is constructed using the integrated output signal. Values of the effective rotation anisotropy and the distribution of the anisotropy are determined from this curve, and are found to be related to the squareness at 90° to the easy direction.