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Room temperature skyrmions in layered magnet

ORAL

Abstract

The Néel-type skyrmion is usually observed at room temperature in multilayer metal films. Polar single-phase magnets, with broken symmetries of spatial inversion and time reversal, are expected to host Néel-type skyrmion. However, their skyrmionic state has been observed only at low temperatures. In this talk, we demonstrated the experimental observation of a Néel-type skyrmion lattice at room temperature in a layered 2D magnet, 50% Co-doped Fe5GeTe2 (FCGT) system. We studied the evolution of skyrmion at various magnetic fields, temperatures, thicknesses, and current in FCGT nanoflakes using Lorentz electron microscopy, variable-temperature magnetic force microscopy, and magneto-transport measurements. The skyrmion can be stabilized in 100~300 nm nanoflake at the temperature range from 260~340 K. The current-induced skyrmion motion was realized at room temperature, with a threshold current density ~ 2.1 ×106 A/cm-2. This discovery of skyrmions at room temperature in a non-centrosymmetric material opens the way for layered device applications.

 

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Presenters

  • Hongrui Zhang

    University of California, Berkeley, UC Berkeley

Authors

  • Hongrui Zhang

    University of California, Berkeley, UC Berkeley

  • Yu-Tsun Shao

    Cornell University

  • Rui Chen

    University of California, Berkeley, UC Berkeley

  • Xiang Chen

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

  • David Raftrey

    University of California, Santa Cruz

  • Ying-Ting Chan

    Rutgers University

  • Sandhya Susarla

    Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Lawrence Berkeley National laboratory

  • Weida Wu

    Rutgers University, Rutgers University, New Brunswick

  • Jie Yao

    University of California, Berkeley, UC Berkeley

  • Peter Ercius

    Berkeley National Laboratory, Lawrence Berkeley National Laboratory

  • Peter J Fischer

    Lawrence Berkeley National Laboratory

  • David A Muller

    Cornell University, School of Applied and Engineering Physics, Cornell University

  • Robert J Birgeneau

    University of California, Berkeley

  • Ramamoorthy Ramesh

    University of California, Berkeley