Microcoercivity, bulk coercivity and saturation remanence in multidomain materials

Microcoercivity, bulk coercivity and saturation remanence in multidomain materials
复制标题

多域材料中的微矫顽力、体矫顽力和饱和剩磁

DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
R. Merrill
R. Merrill
中科院分区：
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文献类型：
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作者：
Song Xu;R. Merrill

文献摘要

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微磁率与畴壁的钉扎力有关，通常被错误地认为与体磁率相同。事实上，排除某些限制的情况下，它表明，体积介电常数是非线性相关的微介电常数。不幸的是，微磁率和体磁率之间的精确函数关系需要对感兴趣的磁性材料做出某些假设。这是通过考虑具有低或高缺陷浓度的刚性畴壁约束得到满足的材料来说明的。体介电常数与温度的简化理论似乎与水热法生长的磁铁矿的测量值相比非常有利。
Microcoercivity is associated with the pinning force of a domain wall and has typically, but erroneously, been taken to be identical to bulk coercivity. Indeed, excluding certain limiting cases, it is shown that bulk coercivity is nonlinearly related to microcoercivity. Unfortunately, the precise functional relation between microcoercivity and bulk coercivity requires making certain assumptions about the magnetic material of interest. This is illustrated by considering materials with either low or high defect concentration for which a rigid domain wall constraint is satisfied. Simplified theory for bulk coercivity versus temperature appears to compare very favorably with measured values for hydrothermally grown magnetites.