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Antiferromagnetic Domain Walls and the Magnetization Process in α-Fe2O3

机译:反铁磁畴壁和α-Fe2O3中的磁化过程

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摘要

The magnetic properties of α-Fe2O3 are of interest since it is a prototype of the class of antiferromagnetic substances possessing a weak ferromagnetism superimposed on the normal antiferromagnetic susceptibility. Two possible sources of the weak ferromagnetism, i.e., moment bearing antiferromagnetic domain walls and special ferrimagnetic forms of Fe2O3, are considered from the standpoint of their magnetization processes. It is noted that moment bearing or nonmoment bearing domain walls may be required by the presence of certain edge and screw dislocations. The net moment of a domain wall may reverse by a wall displacement process or by the motion of a boundary within the domain wall, i.e., a Bloch line. Measurement of the rotational hysteresis in α-Fe2O3 proves that the weak ferromagnetism is not caused by a nonepitaxial second‐phase ferrimagnetic impurity. It is concluded that the behavior of α-Fe2O3 at room temperature can be ascribed to moment bearing domain walls magnetizing by Bloch line motion, and/or ferrimagnetic Fe2O3 basal intergrowths in exchange contact with the antiferromagnetic lattice (Meiklejohn effect). The low‐temperature state can also be qualitatively understood with this model.
机译:α-Fe2O3的磁性是令人感兴趣的,因为它是具有弱铁磁性的一类反铁磁性物质的原型,叠加在正常的反铁磁敏感性上。从其磁化过程的观点来看,考虑了两种弱铁磁的可能来源,即带有反铁磁畴壁的力矩和特殊的亚铁磁性形式的Fe2O3。注意,由于某些边缘和螺钉错位的存在,可能需要带有力矩或非力矩的畴壁。畴壁的净力矩可通过壁位移过程或畴壁内边界的运动(即布洛赫线)而反转。测量α-Fe2O3中的旋转磁滞证明,弱铁磁性不是由非外延第二相亚铁磁性杂质引起的。可以得出结论,α-Fe2O3在室温下的行为可以归因于通过布洛赫线运动而磁化的含力矩畴壁,和/或与反铁磁晶格交换接触的亚铁磁性Fe2O3基础共生体(Meiklejohn效应)。该模型也可以定性地了解低温状态。

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  • 来源
    《Journal of Applied Physics》 |1958年第3期|共2页
  • 作者

    Jacobs I. S.; Bean C. P.;

  • 作者单位

    General Electric Research Laboratory, Schenectady, New York;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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