Electrical-Current-Tuned Ferromagnetism in 2D-van der Waals System Cr<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub>

ORAL

Abstract

Two-dimensional (2D) magnetic systems exhibit intriguing physical properties and technological significance. Cr2Ge2Te6, a ferromagnetic van der Waals material with a Curie temperature at 66 K, is a candidate platform for studying 2D magnetism. The ground state of Cr2Ge2Te6 is a delicate balance among magnetic anisotropy, dimensionality and exchange interactions, making the system tunable under external perturbations. Here, we report our investigation on the electrical-current-tuned structural and physical properties of Cr2Ge2Te6. In particular, we find that the small applied current density effectively reduces the Curie temperature and suppresses it at 0.52 A/cm2. The current-induced changes in the magnetic state closely track those of the lattice, indicating a close correlation between the lattice and the magnetic state. The results of Cr2Ge2Te6 will be discussed with a comparison drawn with other related 2D-van der Waals materials.

*This work was supported by the National Science Foundation via grant DMR-1712101 and No. DMR-1903888, and the German Research Foundation (DFG) under Grant No. AS 523/4-1.

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Presenters

  • Yifei Ni

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado at Boulder

Authors

  • Yifei Ni

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado at Boulder

  • Hengdi Zhao

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado at Boulder

  • Bing Hu

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado at Boulder

  • Sebastian Selter

    • Leibniz Institute for Solid State and Materials Research Dresden

  • Saicharan Aswartham

    • Leibniz Institute for Solid State and Materials Research
    • Leibniz Institute for Solid State and Materials Research Dresden

  • Bernd Büchner

    • Leibniz Institute for Solid State and Materials Research IFW Dresden
    • Leibniz Institute for Solid State and Materials Research
    • Leibniz Institute for Solid State and Materials Research Dresden

  • Gang Cao

    • Physics, University of Colorado Boulder
    • University of Colorado, Boulder
    • Department of physics, University of Colorado at Boulder
    • Department of Physics, University of Colorado at Boulder