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首页> 外文期刊>Physical review >Anomalous Hall effect in 3d/5d multilayers mediated by interface scattering and nonlocal spin conductivity
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Anomalous Hall effect in 3d/5d multilayers mediated by interface scattering and nonlocal spin conductivity

机译：在界面散射和非局部旋转电导率介导的3D / 5D多层中的异常霍尔效应

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摘要

We have evidenced unconventional anomalous Hall effects (AHEs) in 3d/5d (Co0.2nm/Ni0.6nm)_N multilayers grown on a thin Pt layer or thin Au:W alloys with perpendicular magnetic anisotropy (PMA) properties. The inversion of AHEs observed with one Pt series is explained by considering the opposite sign of the effective spin-orbit coupling of Pt compared to Co/Ni combined with peculiar specular electronic reflections. Using advanced simulations methods for the description of the spin-current profiles based on the spin-dependent Boltzmann formalism, we extracted the spin-Hall angle (SHA) of Pt and Co/Ni of opposite sign. The extracted SHA for Pt, +20%, is opposite to the one of Co/Ni, giving rise to an effective AHE inversion for thin Co/Ni multilayers (with the number of repetition layers N ＜ 17). The spin-Hall angle in Pt is found to be larger than the one previously measured by complementary spin-pumping inverse spin-Hall effect experiments in a geometry of current perpendicular to the plane. Whereas magnetic proximity effects cannot explain the effect, spin-current leakage and spin-orbit assisted electron scattering at Pt/(Co,Ni) interfaces fit the experiments. We also extract the main relevant electronic transport parameters governing the overall effects in current-in-plane (CIP) currents and demonstrate, in particular, that the specularityonspecularity in the electronic diffusion processes play an essential role to explain the observed results.
机译：我们已经证明了在薄Pt层或薄的Au：W合金上生长的3D / 5D（COO.2NM / Ni0.6nm）中的非传统的异常霍尔效应（AIH）在薄的Pt层或薄的Au：W合金中，具有垂直磁各向异性（PMA）性质。通过考虑PT的有效旋转轨道耦合与CO / NI结合与特殊的镜面电子反射相比，通过考虑PT的相反符号来解释用一个PT系列观察到的灰色的反转。利用高级模拟方法，用于基于旋转依赖的Boltzmann形式主义的旋转电流型材的描述，我们提取了相反标志的PT和CO / Ni的旋转厅角（SHA）。 Pt，+ 20％的提取的SHA与CO / Ni中的一种相对，产生薄CO / Ni多层的有效AHE反转（具有重复层N <17的数量）。发现PT中的旋转厅角度大于先前通过互补的自旋泵送逆旋转霍尔效应实验在垂直于该平面的电流的几何形状测量的角度。虽然磁性接近效应不能解释效果，旋转电流泄漏和旋转轨道辅助电子散射在Pt /（CO，Ni）接口处适合实验。我们还提取了用于电流平面（CIP）电流的整体效果的主要相关电子传输参数，并且特别地证明了电子扩散过程中的镜面/非分象，起到了重要作用以解释观察结果。

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  • 来源
    《Physical review》 |2020年第14期|144405.1-144405.17|共17页
  • 作者

    T. H. Dang; Q. Barbedienne; D. Q. To; E. Rongione; N. Reyren; F. Godel; S. Collin; J. M. George; H. Jaffres;

  • 作者单位

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

    Unite Mixte de Physique CNRS/Thales University Paris-Sud and Universite Paris-Saclay 91767 Palaiseau France;

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