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硬/软磁复合材料的一致转动模型及其磁滞回线

, PP. 263-268

Keywords: Stoner-Wohlfarth模型,一致转动,磁滞回线

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Abstract:

运用微磁学方法讨论了Stoner-Wohlfarth(SW)模型中单畴粒子的矫顽力、临界场、磁滞回线及其磁能积.当外场与粒子易磁化轴的夹角α≤45°时,矫顽力等于临界场;当α>45°时,矫顽力比临界场小得多.将SW模型简化成更简单的一致转动模型,计算了由硬磁、软磁两相构成的复合双层膜.计算结果表明,当硬软磁两相的易磁化轴都与外磁场平行(α=0°)时,对于λ(=Ks/Kh)值,其磁滞回线为矩形,即临界场等于矫顽力.随着λ的增大,矫顽力和临界场都增大;当外磁场与硬磁相的易轴平行,与软磁相的易轴垂直(α=90°)时,磁滞回线还是矩形的,但矫顽力和临界场随着λ的增大而减小.

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