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Magnetostriction and Elastic Properties of Ferromagnetic Substances at High Magnetic Fields

机译：强磁场下铁磁物质的磁致伸缩和弹性性质

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摘要

The manner in which the anisotropic forced magnetostriction contributes to the magnetostriction of ferromagnetic substances at high magnetic fields is discussed from a localized model of ferromagnetism. With this assumption, the free energy of a ferromagnetic substance can be conveniently divided into several terms and it can be concluded quite naturally that a free‐energy term corresponding to that of ferromagnetic anisotropy gives rise to an anisotropic forced magnetostriction. In the past, the isotropic forced volume magnetostriction has been considered to be the only cause of the forced magnetostriction. This is probably one reason for the discrepancies between the experimental value of the volume magnetostriction and the theoretical value expected from the pressure dependence of the Curie point, etc. From a similar point of view, anomalous behavior of elastic properties of a ferromagnetic substance, such as the change of the temperature coefficient of the elastic constants at the Curie point, the dependence of the elastic constants upon the direction of the magnetic field, etc., are explained as an intrinsic change in the elastic constants with spontaneous magnetization. In the past, these effects have been explained only as a result of the deformation of the crystal lattice due to the spontaneous magnetostriction (volume effect, morphic effect).
机译：从铁磁局部模型讨论了各向异性强迫磁致伸缩对高磁场下铁磁物质的磁致伸缩的影响方式。在此假设下，铁磁物质的自由能可以方便地分为几项，并且可以很自然地得出结论，与铁磁各向异性对应的自由能项会引起各向异性强迫磁致伸缩。在过去，各向同性的强制体积磁致伸缩被认为是强迫磁致伸缩的唯一原因。这可能是体积磁致伸缩的实验值与根据居里点的压力依赖性等预期的理论值之间存在差异的原因之一。从相似的角度来看，铁磁物质的弹性特性异常，例如作为居里点的弹性常数的温度系数的变化，将弹性常数对磁场的方向的依存性等作为自发磁化的弹性常数的固有变化进行说明。过去，仅由于自发的磁致伸缩引起的晶格变形（体积效应，形态效应）而解释了这些效应。

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  • 来源
    《Journal of Applied Physics》 |1958年第3期|共3页
  • 作者

    Sato Hiroshi;

  • 作者单位

    Scientific Laboratory, Ford Motor Company, Dearborn, Michigan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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