The analysis of torque measurements made with a torque magnetometer on ferromagnetic single-crystal specimens with low magnetocrystalline anisotropy

Abstract

The sources of error in torque measurements on ferromagnetic single-crystal disks of materials with low magnetocrystalline anisotropy are discussed. These errors are shown to be of the same order of magnitude as the torque due to the anisotropy, and a method for correcting the torque curve is given. The effect of the variation of applied magnetic field on the values of the anisotropy constants measured is considered and the form of the extrapolation to infinite field is shown to be different from that required for materials with higher magnetocrystalline anisotropy. The error and field variation effects are illustrated by examples of measurements made on 4% molybdenum permalloy specimens.