Electric Field Effect in Multilayer Cr$_{\mathrm{2}}$Ge$_{\mathrm{2}}$Te$_{\mathrm{6}}$: a Ferromagnetic Two-Dimensional Material

ORAL

Abstract

Two-dimensional (2D) ferromagnetic materials are very attractive for their magnetic properties and future spintronics devices applications. In this talk, I will present our experimental results on the preparation and characterization of a 2D ferromagnetic material: Cr$_{\mathrm{2}}$Ge$_{\mathrm{2}}$Te$_{\mathrm{6}}$ (CGT). The bulk crystal CGT is synthesized by flux method, and it is a ferromagnetic insulator with the Curie temperature of \textasciitilde 65 K. Owing to the van der Waals nature of the crystal structure, we are able to prepare CGT flakes with thicknesses down to a few nanometers using the mechanical exfoliation method. Then the electrical measurements are performed by fabricating nano devices on a series of CGT flakes with different thicknesses. There, we have observed that the intrinsically insulating 2D CGT flakes could be tuned to be metallic using the electric field effect. Furthermore, the ferromagnetic properties of the 2D CGT flakes are characterized by Kerr rotation and anomalous Hall measurements.

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Authors

  • Wenyu Xing

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Yangyang Chen

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Patrick M. Odenthal

    • Department of Physics and Astronomy, University of Utah, UT 84112, USA

  • Xiao Zhang

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Wei Yuan

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Tang Su

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Qi Song

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Tianyu Wang

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Jiangnan Zhong

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Shuang Jia

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • X. C. Xie

    • International Center for Quantum Materials, Peking University, Beijing 100871, China

  • Yan Li

    • Department of Physics and Astronomy, University of Utah, UT 84112

  • Wei Han

    • Peking University, Beijing,China
    • International Center for Quantum Materials, Peking University, Beijing 100871, China