Magnetization Reversal Mechanism of Co-Cr Perpendicular Magnetic Recording Media

Abstract

In order to investigate the reversal mechanism of magnetization, angular dependence of hysteresis loss was discussed for Co-Cr perpendicular recording media. For a so-called double layer medium which consists of a Co-Cr layer and a Permalloy back layer, it was easily shown that the Co-Cr layer shows rotational reversal of magnetization. Judging from both angular dependences of Hc and hysteresis loss, the initial and column layers in Co-Cr sputtered film were found to show magnetization reversal by domain wall motion and by rotation, respectively. Other Co-Cr films which have different Ms and Hc were also studied with respect to their reversal mechanism of magnetization.