Single-domain theory for the reversible effect of small uniaxial stress upon the remanent magnetization of rock
Single-domain theory for the reversible effect of small uniaxial stress upon the remanent magnetization of rock
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小单轴应力对岩石剩磁可逆效应的单畴理论
DOI：
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发表时间：
1977
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通讯作者：
J. Hodych
中科院分区：
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作者：
J. Hodych
这篇关于小单轴应力改变岩石剩磁的论文是我之前关于应力变化敏感性的论文的姊妹篇，这两种现象都是当前地震预测尝试中感兴趣的。对于含有具有立方磁晶各向异性（K1 正或负）和各向异性的铁磁体单畴晶粒的样品，推导了平行于应力轴的剩磁可逆变化的理论表达式（使用严格的能量最小化，但忽略热激活）磁致伸缩。假设颗粒是沿着 、 、 或 拉长的非相互作用且随机定向的球体或旋转椭球体。此外，还给出了包含具有非常强钉扎壁的多域晶粒的样品的近似表达式。讨论了热（或化学）、非磁滞和饱和剩磁。对于垂直于应力轴的剩磁变化，预计上述平行于应力轴变化的表达式为 -1/2，即...
This paper on small uniaxial stress changing the remanent magnetization of rock is a companion to my previous paper on stress changing susceptibility, both phenomena being of current interest in attempts at earthquake forecasting.Theoretical expressions are derived (using rigorous energy-minimization but ignoring thermal activation) for reversible change in remanence parallel to the stress axis for samples containing single-domain grains of a ferromagnet with cubic magnetocrystalline anisotropy (K1 positive or negative) and anisotropic magnetostriction. The grains are assumed to be non-interacting and randomly oriented spheres or ellipsoids of revolution elongated along , , or . Also, approximate expressions are given for samples containing multidomain grains with very strongly pinned walls. Thermal (or chemical), anhysteretic, and saturation remanence are discussed.For remanence change perpendicular to the stress axis, one expects −1/2 the above expressions for change parallel to the stress axis, which i...