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Giant room temperature anomalous Hall effect and magnetically tuned topology in the ferromagnetic Weyl semimetal Co<sub>2</sub>MnAl

ORAL

Abstract

Weyl semimetals have been extensively studied due to their exotic properties such as topological surface states and anomalous transport phenomena. Their band structure topology is usually predetermined by material parameters and can hardly be manipulated once the material is formed. By calculations and experiments, we reveal a tunable, giant anomalous Hall effect in the ferromagnet Co2MnAl. The transition between Weyl points and nodal rings occurs when rotating the magnetization axis. We propose a material recipe to generate the giant anomalous Hall effect by gaping nodal rings without requiring the existence of Weyl points. In addition, experiments show the strong anomalous Hall effect even at room temperature with a large Hall angle 21%. Our work reveals an ideal intrinsically magnetic platform to explore the interplay between magnetic dynamics and topological physics for the development of a new generation of spintronic devices.

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Presenters

  • Jahyun Koo

    Weizmann institute of science

Authors

  • Peigang Li

    Tulane University

  • Jahyun Koo

    Weizmann institute of science

  • Wei Ning

    Pennsylvania state University

  • Jinguo Li

    Chinese Academy of Sciences

  • Leixin Miao

    Materials Science and Engineering, Penn State University, Pennsylvania State University, Pennsylvania state University

  • Lujin Min

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802, USA, Pennsylvania State University, Pennsylvania state University

  • Yanglin Zhu

    Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Pennsylvania State University, Penn State University, Physics, Penn State University, Pennsylvania state University

  • Yu Wang

    Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Physics, Penn State University, Pennsylvania state University

  • Nasim Alem

    Pennsylvania State University, Pennsylvania state University

  • Chao-Xing Liu

    Department of Physics, Pennsylvania State University, Department of Physics, the Pennsylvania State University, Pennsylvania State University, Pennsylvania state University

  • Zhiqiang Mao

    Pennsylvania State University, Tulane University, Physics, Pennsylvania State University, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Penn State University, Physics, Penn State University, The Pennsylvania State University

  • binghai yan

    Department of Condensed Matter Physics, Weizmann Institute of Science, Weizmann Institute of Science, Weizmann institute of science