Magnetism near room temperature in thin flakes of Fe5GeTe2

ORAL

Abstract

Two-dimensional (2D) magnets are an emerging class of materials that exhibit intrinsic magnetic order in the ultrathin limit. An immediate challenge is to realize 2D magnetic order at high temperature. Indeed, molecular beam epitaxy has successfully synthesized monolayers that are magnetically ordered at room temperature. Controlled intercalation of Li ions into a few layers of Fe3GeTe2 also increases magnetic order from low temperature up to room temperature. However, obtaining an exfoliated 2D magnet with an intrinsically-high Curie/Neel temperature remains a challenge. Here we show experimental evidence of ferromagnetic ordering around temperature in thin flakes of cleavable van der Waals magnet Fe5GeTe2. Anomalous Hall effect measurements and magneto-optic Kerr effect point towards out of plane anisotropy. Furthermore, our devices exhibit high metallicity and a rich phase diagram.

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Presenters

  • Dmitry Ovchinnikov

    University of Washington

Authors

  • Dmitry Ovchinnikov

    University of Washington

  • Andrew May

    Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak-Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory

  • Bevin Huang

    University of Washington, Physics, University of Washington, Seattle

  • Zaiyao Fei

    University of Washington, Physics, University of Washington, Seattle, Department of Physics, University of Washington

  • Qiang Zheng

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Michael A McGuire

    Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Xiaodong Xu

    University of Washington, Department of Physics, University of Washington, University of Washington, Seattle