Abstract
In order to investigate the mechanism of magnetization reversal in Co-Cr perpendicular recording media, the angular dependence of the hysteresis loss was investigated. For a double-layer medium consisting of a Co-Cr layer and a Permalloy backing layer, it is easy to show that rotational magnetization reversal occurs in the Co-Cr layer. Judging from both the angular dependences of H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> and of the hysteresis loss, the initial growth layer and the columnar structure layer in Co-Cr sputtered film were found to undergo magnetization reversal by domain wall motion and by rotation, respectively. Other Co-Cr films with different M <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</inf> and H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> values were also studied with respect to the prevailing mechanism of magnetization reversal.
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