Anomalous Hall effect in Pt/Cr2Ge2Te6 heterostructures

ORAL

Abstract

Understanding the physical properties of 2D ferromagnets such as Cr2Ge2Te6 (CGT), amongst a plethora of others, has accelerated due to their properties in one to few layers as well as their ability to easily form heterostructures with other 2D materials. This feature is extremely attractive due to the possibility of manipulating interfacial interactions via proximity coupling. Here we demonstrate the anomalous Hall effect (AHE) in Pt thin films sputtered onto the surface of thin exfoliated flakes of CGT which must originate in Pt since CGT is essentially an insulator at low temperatures. The AHE loops persist up to TC ~ 60 K which matches well to the bulk value. Low-temperature magnetic force microscopy of Pt/CGT reveals magnetic field dependent domain structures consistent with the AHE behavior. The origin of the AHE in Pt/CGT heterostructures is explored through density functional theory calculations. The method used in this study is a powerful tool to understand magnetism in 2D ferromagnetic insulators and provides a new platform for the study of magnetic proximity exchange and spin-dependent transport phenomena.

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Presenters

  • Mark Lohmann

    University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside

Authors

  • Mark Lohmann

    University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside

  • Tang Su

    Physics and Astronomy, University of California, Riverside, International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics, Peking University, School of Physics, Peking University

  • Mohammed Alghamdi

    University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside

  • Ben Niu

    University of California, Riverside

  • Yusheng Hou

    University of California, Irvine

  • Mohammed Aldosary

    Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA, University of California, Riverside

  • Wenyu Xing

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics, Peking University

  • Jiangnan Zhong

    International Center for Quantum Materials, School of Physics, Peking University

  • Shuang Jia

    International Center for Quantum Materials, Peking University, Peking University, China, Physics, Peking University, Peking University, International Center for Quantum Materials, School of Physics, Peking University

  • Wei Han

    International Center for Quantum Materials, School of Physics, Peking University

  • Ruqian Wu

    University of California, Irvine, Department of Physics and Astronomy, University of California, Irvine, CA, United States, Fudan University, Department of Physics and Astronomy, University of California, Irvine

  • Yongtao Cui

    University of California, Riverside

  • Jing Shi

    University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA, Physics, UCR, Physics and Astronomy, University of California, Riverside, Physics and Astronomy, UC riverside