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首页> 外文期刊>Physical review >Large magneto-optical Kerr effect in noncollinear antiferromagnets Mn_3X (X = Rh, Ir, Pt)
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Large magneto-optical Kerr effect in noncollinear antiferromagnets Mn_3X (X = Rh, Ir, Pt)

机译：非共线反铁磁体Mn_3X中的大磁光Kerr效应（X = Rh，Ir，Pt）

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摘要

Magneto-optical Kerr effect, normally found in magnetic materials with nonzero magnetization such as ferromagnets and ferrimagnets, has been known for more than a century. Here, using first-principles density functional theory, we demonstrate large magneto-optical Kerr effect in high-temperature noncollinear antiferromagnets Mn_3X (X = Rh, Ir, Pt), in contrast to usual wisdom. The calculated Kerr rotation angles are large, being comparable to that of transition-metal magnets such as bcc Fe. The large Kerr rotation angles and ellipticities are found to originate from the lifting of band double degeneracy due to the absence of spatial symmetry in the Mn_3X noncollinear antiferromagnets which together with the time-reversal symmetry would preserve the Kramers theorem. Our results indicate that Mn_3X would provide a rare material platform for exploration of subtle magneto-optical phenomena in noncollinear magnetic materials without net magnetization.
机译：磁光克尔效应通常在具有非零磁化强度的磁性材料（如铁磁体和亚铁磁体）中发现，已有一个多世纪的历史了。在这里，使用第一原理密度泛函理论，我们证明了高温非共线反铁磁体Mn_3X（X = Rh，Ir，Pt）中的大磁光Kerr效应，这与通常的看法相反。计算出的Kerr旋转角很大，可与bcc Fe等过渡金属磁体的旋转角相比。发现大的Kerr旋转角和椭圆率是由于Mn_3X非共线反铁磁体中不存在空间对称性而引起的带双简并性的提升而引起的，而时间反向对称性将保留Kramers定理。我们的结果表明，Mn_3X将为探索非共线磁性材料中的细微磁光现象而没有净磁化提供一个稀有的材料平台。

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  • 来源
    《Physical review》 |2015年第14期|144426.1-144426.6|共6页
  • 作者

    Wanxiang Feng; Guang-Yu Guo; Jian Zhou; Yugui Yao; Qian Niu;

  • 作者单位

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan,School of Physics, Beijing Institute of Technology, Beijing 100081, China;

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan,Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan;

    Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;

    School of Physics, Beijing Institute of Technology, Beijing 100081, China;

    Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA,International Center for Quantum Materials and Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China;

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  • 正文语种 eng
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  • 关键词

    relativistic effects; intrinsic properties of magnetically ordered materials; antiferromagnetics; magnetooptical effects;

    机译：相对论效应;磁性有序材料的固有特性;反铁磁磁光效应;

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