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首页> 外文期刊>Physical review >Electric field control and effect of Pd capping on magnetocrystalline anisotropy in FePd thin films: A first-principles study
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Electric field control and effect of Pd capping on magnetocrystalline anisotropy in FePd thin films: A first-principles study

机译:电场控制和Pd封端对FePd薄膜中磁晶各向异性的影响:第一性原理研究

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摘要

Using ab initio electronic structure calculations, we have investigated the effect of an electric field and of a heavy-metal cap of Pd on the magnetocrystalline anisotropy (MCA) of FePd ultrathin film. Analysis of the energy- and k-resolved distribution of the orbital character of the minority-spin band reveals that the perpendicular MCA of the uncapped film mainly arises from the spin-orbit coupling (SOC) between unoccupied Fe d_(xy) and occupied Fe d_(x~2-y~2) states. On the other hand, the SOC between the Pd- and Fe-derived d states yields negative contributions to the MCA. We find that the sensitivity of the surface anisotropy energy to the applied electric field is 18 fJ/(Vm) and is due to changes in the occupation of the surface Fe atoms d_(x~2-y~2) and (d_(xz),d_(yz)) orbitals. We demonstrate that the thickness of the Pd cap has a dramatic effect on the MCA and can even switch the magnetization from out-of- to in-plane orientation. The underlying origin is the change of the position and orbital character of the spin-polarized quantum well states induced in the Pd cap by varying its thickness. These results have important implications for exploiting heavy metals with large spin-orbit coupling (Ru, Pd, Ta, Pt, or Au) as contacts with ferromagnetic thin films to tailor the magnetic switching of spintronic devices by tuning the cap thickness.
机译:使用从头算电子结构计算,我们研究了电场和Pd的重金属帽对FePd超薄膜的磁晶各向异性(MCA)的影响。对少数自旋带轨道特性的能量和k分辨分布的分析表明,未盖膜的垂直MCA主要来自未占据的Fe d_(xy)和占据的Fe之间的自旋轨道耦合(SOC)。 d_(x〜2-y〜2)状态。另一方面,Pd和Fe衍生的d状态之间的SOC对MCA产生负面影响。我们发现表面各向异性能对施加电场的敏感度为18 fJ /(Vm),这是由于表面Fe原子d_(x〜2-y〜2)和(d_(xz ),d_(yz))轨道。我们证明了Pd帽的厚度对MCA产生了巨大影响,甚至可以将磁化强度从面外定向转换为面内定向。潜在的起源是通过改变其厚度在Pd帽中感应的自旋极化量子阱状态的位置和轨道特性的变化。这些结果对于利用具有大自旋轨道耦合(Ru,Pd,Ta,Pt或Au)的重金属作为与铁磁薄膜的接触,以通过调整帽盖厚度来调整自旋电子器件的磁性开关具有重要意义。

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  • 来源
    《Physical review》 |2014年第9期|094422.1-094422.8|共8页
  • 作者单位

    Department of Physics and Astronomy, California State University Northridge, Northridge, California 91330, USA;

    Department of Physics and Astronomy, California State University Northridge, Northridge, California 91330, USA;

    Department of Electrical Engineering, University of California, Los Angelar, California 90095, USA;

    Department of Electrical Engineering, University of California, Los Angelar, California 90095, USA;

    Department of Electrical Engineering, University of California, Los Angelar, California 90095, USA;

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, California 90095, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA;

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

    magnetic anisotropy; magnetic properties of interfaces (multilayers, superlattices, heterostructures); electron states at surfaces and interfaces;

    机译:磁各向异性界面的磁性(多层;超晶格;异质结构);表面和界面的电子态;

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