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首页> 外文期刊>Physical review >Robust topological Hall effect driven by tunable noncoplanar magnetic state in Mn-Pt-In inverse tetragonal Heusler alloys
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Robust topological Hall effect driven by tunable noncoplanar magnetic state in Mn-Pt-In inverse tetragonal Heusler alloys

机译：在MN-PT型逆四方Heusler合金中，可调谐非平板磁能驱动的鲁棒拓扑霍米效应

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摘要

Manipulation of magnetic ground states by effective control of competing magnetic interactions has led to the finding of many exotic magnetic states. In this direction, the tetragonal Heusler compounds consisting of multiple magnetic sublattices and crystal symmetry favoring chiral Dzyaloshinskii-Moriya interaction (DMI) provide an ideal base to realize nontrivial magnetic structures. Here we present the observation of a large robust topological Hall effect (THE) in the multisublattice Mn_(2-x) PtIn Heusler magnets. The topological Hall resistivity, which originates from the nonvanishing real space Berry curvature in the presence of nonzero scalar spin chirality, systematically decreases with decreasing the magnitude of the canting angle of the magnetic moments at different sublattices. With help of first-principle calculations, magnetic and neutron diffraction measurements, we establish that the presence of a tunable noncoplanar magnetic structure arising from the competing Heisenberg exchanges and chiral DMI from the D_(2d) symmetry structure is responsible for the observed THE. The robustness of the THE with respect to the degree of noncollinearity adds up a new degree of freedom for designing THE based spintronic devices.
机译：通过有效控制竞争磁相互作用的操纵，导致了许多异国情调的磁力状态。在这种方向上，由多个磁性分组和晶体对称组成的四方的Heusler化合物，偏好手性Dzyaloshinskii-moriya相互作用（DMI）提供了实现非磁性结构的理想基础。在这里，我们展示了MultiSullatt MN_（2-X）Ptin Heusler磁体中的大型鲁棒拓扑霍尔效应（The）。拓扑霍尔电阻率起源于非零标量旋转手术的存在下的非衰弱实际空间浆果曲率，随系统地减少，随着磁矩在不同的子组件下的倾斜角度的大小而下降。借助于第一原理计算，磁性和中子衍射测量，我们确保从竞争的Heisenberg交换和来自D_（2D）对称结构的手性DMI产生的可调谐非平板磁性结构的存在负责观察到的。对于非可口性程度的鲁棒性增加了设计基于旋转式设备的新自由度。

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  • 来源
    《Physical review》 |2020年第1期|014449.1-014449.6|共6页
  • 作者

    Bimalesh Giri; Arif Iqbal Mallick; Charanpreet Singh; P. V. Prakash Madduri; Francoise Damay; Aftab Alam; Ajaya K. Nayak;

  • 作者单位

    School of Physical Sciences National Institute of Science Education and Research HBNI Jatni-752050 India;

    Department of Physics Indian Institute of Technology Bombay Mumbai 400076 India;

    School of Physical Sciences National Institute of Science Education and Research HBNI Jatni-752050 India;

    School of Physical Sciences National Institute of Science Education and Research HBNI Jatni-752050 India;

    Laboratoire Leon Brillouin CEA-CNRS CEA Saclay 91191 Gif-sur-Yvette France;

    Department of Physics Indian Institute of Technology Bombay Mumbai 400076 India;

    School of Physical Sciences National Institute of Science Education and Research HBNI Jatni-752050 India;

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