Anisotropy design in magnetic media: A micromagnetics study

Abstract

We have investigated the characteristics of model magnetic media using different strategies for the "anisotropy design." We modeled media with intragrain anisotropy oriented random in the plane of the media, random in 3D, and aligned along the track direction, and for a large range of anisotropy field Hk and intergranular exchange J. We report a possible scaling function which collapses data for all three geometries onto a single universal curve. The rescaled data were then analyzed along with the signal-and-noise functions from the various model materials. For any geometry, we find a relation between exchange and anisotropy which maximizes the signal-to-(media) noise function. © 1998 American Institute of Physics.