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Giant magnetic anisotropy of the bulk antiferromagnets IrMn and IrMn_3 from first principles

机译:从第一原理到块状反铁磁体IrMn和IrMn_3的巨磁各向异性

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摘要

We perform an ab initio study of the ordered phases of IrMn and IrMn_3, the most widely used industrial antiferromagnets. Calculation of the form and the strength of the magnetic anisotropy allows the construction of an effective spin model, which is tested against experimental measurements regarding the magnetic ground state and the Neel temperature. Our most challenging result is the extremely strong second-order anisotropy for lrMn_3 appearing in its frustrated triangular magnetic ground state, which is surprising since the ordered L1_2 phase has a cubic symmetry. We explain this large anisotropy by the fact that cubic symmetry is locally broken for each of the three Mn sublattices.
机译:我们从头开始研究了最广泛使用的工业反铁磁体IrMn和IrMn_3的有序相。磁各向异性的形式和强度的计算允许构建有效的自旋模型,将其与关于磁基态和尼尔温度的实验测量进行对比。我们最具挑战性的结果是lrMn_3的极强二阶各向异性出现在其受挫的三角磁性基态中,这是令人惊讶的,因为有序的L1_2相具有立方对称性。我们通过对三个Mn亚晶格中的每一个局部破坏立方对称这一事实来解释这种较大的各向异性。

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  • 来源
    《Physical review》 |2009年第4期|020403.1-020403.4|共4页
  • 作者单位

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H1111 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H1111 Budapest, Hungary Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H1111 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H1111 Budapest, Hungary;

    Department of Physics, University of York, York YO10 5DD, United Kingdom;

    Fachbereich Physik, Universitiit Konstanz, 78457 Konstanz, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic anisotropy; magnetic recording materials; density functional theory; local density approximation; gradient and other corrections; relativistic effects;

    机译:磁各向异性磁记录材料;密度泛函理论;局部密度近似;梯度和其他校正;相对论效应;

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