Anomalous Hall effect in Pt/Cr<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> 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.

*This work is support by DOE (USA) BES Award No. DE-FG02-07ER46351
DFT calculations at UC Irvine was supported by DOE-BES Grant No. DE-FG02-05ER46237 and NERSC

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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