9.保磁力制御層を有する磁性粒子の保磁力低減メカニズム

概要

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A magnetic particle with coercivity control layers (CCL), which stacks a hard magnetic region and a soft magnetic region, can reduce the coercivity than a usual magnetic particle without a soft magnetic region. The coercivity decrease mechanism is considered from a viewpoint of magnetic torque, and it is found that the exchange interaction between the hard region and the soft region assists the magnetic switching in the hard region, and that the magnetic torque due to magnetic anisotropy is decreased by forming ununiform magnetization configuration. The thermal stability of magnetic particle with CCL is inferior to that of a usual magnetic particle with the same anisotropy constant, as the magnetic particle with CCL. However, the thermal stability is superior to that of a usual particle with the same coercivity. As a result, a magnetic particle with CCL with a relatively small coercivity can be utilized as a recording medium without damaging the thermal stability. Moreover, it was found that incoherent magnetic reversal takes place at a finite temperature in the magnetic particle of which the reversal mechanism is coherent at OK.
工学院大学の論文
2006-04-30