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Negative magnetothermal resistance in a disordered two-dimensional antiferromagnet

机译:二维反铁磁体中的负磁热电阻

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摘要

We demonstrate that a weak external magnetic field can induce negative magnetothermal resistance for magnons in a disordered two-dimensional antiferromagnet. We study the main effect of a weak external magnetic field on the longitudinal thermal conductivity k_(xx) for a disordered antiferromagnet using the weak-localization theory for magnons. We show that the weak-localization correction term of k_(xx) positively increases with increasing the magnetic field parallel to the ordered spins. Since this increase corresponds to a decrease of the thermal resistivity, this phenomenon is negative magnetothermal resistance for magnons. This negative magnetothermal resistance and the weak localization of magnons will be used to control the magnon thermal current in antiferromagnetic spintronics devices. We also discuss several implications for further experimental and theoretical studies for disordered magnets.
机译:我们证明了弱的外部磁场可以在二维无序反铁磁体中为磁振子产生负的磁热电阻。我们使用磁振子的弱局部化理论研究了弱外部磁场对无序反铁磁体的纵向热导率k_(xx)的主要影响。我们显示,随着平行于有序自旋的磁场的增加,k_(xx)的弱局部校正项正增加。因为这种增加对应于热阻的减小,所以这种现象是对于磁振子的负磁热阻。这种负的磁热电阻和磁振子的弱定位将用于控制反铁磁自旋电子器件中的磁振子热电流。我们还将讨论对无序磁体的进一步实验和理论研究的一些含义。

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  • 来源
    《Physical review》 |2017年第21期|214404.1-214404.7|共7页
  • 作者

    Naoya Arakawa; Jun-ichiro Ohe;

  • 作者单位

    Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan;

    Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan;

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  • 正文语种 eng
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