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Patterning-induced ferromagnetism of Fe<sub>3</sub>GeTe<sub>2</sub> van der Waals materials beyond room temperature

ORAL

Abstract

Magnetic van der Waals (vdW) materials have emerged as promising candidates for spintronics applications especially after the recent discovery of intrinsic ferromagnetism in monolayer vdW materials. There has been a critical need for tunable ferromagnetic vdW materials beyond room temperature. Here we report a real space imaging study of itinerant ferromagnet Fe3GeTe2 and the enhancement of its Curie temperature well above ambient temperature. We find that the magnetic long-range order in Fe3GeTe2 is characterized by an unconventional out-of-plane stripe domain phase. In Fe3GeTe2 microstructures patterned by focused ion beam, the out-of-plane stripe domain phase undergoes a surprising transition at 230 K to an in-plane vortex phase that persists beyond room temperature. The discovery of tunable ferromagnetism in Fe3GeTe2 materials opens up vast opportunities for utilizing vdW magnets in room temperature spintronics devices.

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Presenters

  • Mengmeng Yang

    University of California, Berkeley, Department of Physics, UC Berkeley

Authors

  • Mengmeng Yang

    University of California, Berkeley, Department of Physics, UC Berkeley

  • Qian Li

    University of California, Berkeley

  • Cheng Gong

    University of California, Berkeley

  • Rajesh V Chopdekar

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Alpha T. N'Diaye

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory, Adv Light Source LBL

  • John Turner

    Lawrence Berkeley National Lab

  • Gong Chen

    University of California-Davis

  • Andreas Scholl

    Lawrence Berkeley National Lab

  • Padraic Shafer

    Lawrence Berkeley National Lab, Advanced Light Source, LBNL, Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory

  • Elke Arenholz

    Lawrence Berkeley National Lab, Advanced Light Source, LBNL, Adv Light Source LBL

  • Andreas Schmid

    Lawrence Berkeley National Lab

  • Sheng Wang

    University of California at Berkeley, University of California, Berkeley, Department of Physics, University of California, Berkeley

  • Kai Liu

    Georgetown University, University of California-Davis, Physics Department, Georgetown University

  • Nan Gao

    University of California, Berkeley

  • Alemayehu S Admasu

    Rutgers Center for Emergent Materials, Rutgers University, Rutgers University, New Brunswick

  • Sang-Wook Cheong

    Rutgers University, R-CEM & Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials, Rutgers University, Department of Physics and Astronomy, Center for Emergent Materials, Rutgers University; Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technol, Physics and Astronomy, Rutgers University, Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers University, Piscataway, Department of Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Department of Physics, Rutgers University, Physics & Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Physics, Rutgers University, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • Chanyong Hwang

    Korea Research Institute of Standards and Science

  • Jia Li

    Peking Univerisity

  • Feng Wang

    University of California at Berkeley, University of California, Berkeley, UC Berkeley, Physics, University of California, Berkeley, University of California, Berkeley and MSD, LBNL, Department of Physics, University of California, Berkeley

  • Xiang Zhang

    University of California at Berkeley, University of California Berkeley, University of California, Berkeley

  • Zi Q. Qiu

    University of California, Berkeley, Department of Physics, UC Berkeley