Néel-type skyrmion in WTe<sub>2</sub>/Fe<sub>3</sub>GeTe<sub>2</sub> van der Waals heterostructure

ORAL

Abstract

Topologically protected skyrmions are highly promising for spintronic devices and applications. Recently, long-range intrinsic magnetic orders in the van der Waals materials provide a new platform for the discovery of novel physics and phenomena. In this work, we demonstrate the Dzyaloshinskii-Moriya interaction and Néel-type skyrmions are induced at the WTe2/Fe3GeTe2 interface, a van der Waals heterostructure. Topological Hall effect has been observed in this heterostructure for temperatures below 100 K. In addition, we use Lorentz transmission electron microscopy and successfully obtain images of Néel-type skyrmion lattice and the stripe-like magnetic domain structures. These are direct evidence for the skyrmions. Furthermore, we estimate interfacial coupling induced Dzyaloshinskii-Moriya interaction in this system, which has a large energy of 1.0 mJm-2. This work first time points out a new direction of spintronics in van der Waals layered heterostructures.

*US Department of Energy under grand DE-SC0019068, ARO program under contract W911NF-15-1-10561, National Science Foundation(NSF) nos. 1935362 and 1909416, the Spins and Heat in Nanoscale Electronic Systems award #SC0012670, NSF DMR-1411085, King Abdullah University of Science and Technology No. OSR-2016-CRG5-2977

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Presenters

  • Yingying Wu

    • University of California, Los Angeles
    • Department of Electrical and Computer Engineering, University of California, Los Angeles

Authors

  • Yingying Wu

    • University of California, Los Angeles
    • Department of Electrical and Computer Engineering, University of California, Los Angeles

  • Senfu Zhang

    • KAUST

  • junwei zhang

    • KAUST

  • Gen Yin

    • University of California, Los Angeles

  • Zhiqiang Mao

    • Pennsylvania State University
    • Department of Physics, Penn State University
    • The Pennsylvania State University
    • Penn State University
    • Physics, Penn State University
    • Department of Physics, Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Materials Science and Engineering, Pennsylvania State University

  • Xixiang Zhang

    • KAUST

  • Caihua Wan

    • CAS

  • Xiufeng Han

    • CAS
    • Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

  • Kang-Lung Wang

    • Department of Electrical and Computer Engineering, University of California, Los Angeles
    • University of California, Los Angeles