Magnetization Reversal in Patterned Media

Magnetization reversal mechanisms for single patterned media elements have been examined. Sizes and magnetic properties have been examined for parallelepipeds of fixed aspect ratio. For element sizes for 1 Tbit/in
²
recording magnetization reversal is nearly uniform for a uniform applied field. For fields covering a small percentage of the element volume nonuniform reversal occurs and the reversal field increases at a much smaller rate than inversely as the volume covered