Interparticle Interaction and Magnetic Anisotropy in Metal Evaporated Tape.

Magnetic anisotropy derived from interparticle interactions in CoPtCr/SiO2 granular thin film longitudinal media

“…For metal evaporated ͑ME͒ tape, the total magnetic anisotropy of the medium has been successfully separated into the magnetocrystalline anisotropy of each particle and the magnetic interaction anisotropy between particles. 12,13,35 The same procedure is applied to determine the origin of the magnetic anisotropy of CoPtCr/SiO 2 granular thin film longitudinal medium. In this article, the intrinsic magnetic anisotropy constants, K u1 and K u2 , are assumed to consist of those of each particle, K u1 (p) and K u2 (p), and those of interparticle interactions, K u1 (i) and K u2 (i).…”

“…If the angular dependence of the switching field distribution and the interaction fields of the medium are not known, however, the Preisach model cannot be applied to analyze the recording process. In a series of studies, [11][12][13][14][15]36 it was shown that the switching field distribution and the interaction fields in the medium can be separately obtained from the remanent magnetization curves. The method described here for evaluating the magnetic interaction anisotropy in the recording media should be helpful in the development of the Preisach hysteresis model.…”

“…For particulate media, the effect of interparticle interactions on the magnetic anisotropy has been verified by studying the angular dependence of the interaction fields. [11][12][13][14][15] A study of the effect of magnetostatic interactions on the magnetic anisotropy in granular media should lead to a better understanding of the magnetizing and demagnetizing process in the media and the effect of interactions on media noise.…”