Determining magnetic anisotropy constants with an RSM

Anisotropy energy terms may be obtained by measuring and analyzing the rotating sample magnetometer output as a function of field over a range of harmonic frequencies. General expressions for outputs are calculated in terms of the frequency of rotation and detection, field, magnetization, and anisotropy. Applications to a specific measurement, that of detecting anisotropy constants in uniaxial films, are shown experimentally. For cases in which anisotropic specimens are also single domain, related techniques are presented and also illustrated experimentally with films.