Layer Dependent MCD on Van der Waal-like 2D ferromagnetism

ORAL

Abstract

The layered ferromagnetic semiconductor CrSiTe3 is a promising candidate for spintronic applications. According to DFT calculations, its bulk bandgap is predicted to be ~0.4 eV; meanwhile, a Curie temperature of ~33 K was reported, thus providing evidence for bulk ferromagnetism. More importantly, due to the van der Waal-like interlayer coupling, CrSiTe3 is exfoliable and possible to achieve monolayers through mechanical exfoliation making it appealing for 2D spintronics. However, the fundamental properties of CrSiTe3 have not been thoroughly studied, particularly in the few layers limit. . A number of of theoretical reports, suggest that the monolayer could have a larger bandgap but the presence of magnetism is still debatable (FM or AFM order). Nonetheless, among these predictions, the common agreement is that the decisive factor causing FM- or AFM-exchange coupling is the distance between Cr-Te-Cr bonds, which indicates that the spin configuration is closely related to the lattice. Therefore, In order to study the presence of magnetism and to understand the role spin-phonon interaction, we performed layer-dependent magnetization measurements via the magnetic circular dichroism (MCD) and Raman spectroscopy at different Ts.

*DOE-BES (Award No. DE-SC0002613). NSF/DMR-1644779.

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Presenters

  • Yu-Che Chiu

    • National High Magnetic Field Laboratory
    • Florida State University

Authors

  • Yu-Che Chiu

    • National High Magnetic Field Laboratory
    • Florida State University

  • Zhenguang Lu

    • National High Magnetic Field Laboratory
    • Department of Physics, Florida State University

  • Daniel A Rhodes

    • Columbia University
    • Physics, Columbia University
    • National High Magnetic Field Laboratory, Tallahassee, FL-32310, USA.
    • Columbia Nano Initiative, Columbia University
    • Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA
    • Mechanical Engineering, Columbia University
    • Columbia Univ

  • Yuxuan Jiang

    • National High Magnetic Field Laboratory

  • Dmitry Smirnov

    • National High Magnetic Field Laboratory
    • Natl High Magnetic Field Lab
    • National High Magnetic Field Lab
    • Condensed Matter Science, National High Magnetic Field Laboratory

  • James Hone

    • Columbia University
    • Mechanics, Columbia University
    • Department of Mechanical Engineering, Columbia University in the City of New York
    • Department of Mechanical Engineering, Columbia University
    • Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA
    • Mechanical Engineering, Columbia University

  • Luis Balicas

    • National High Magnetic Field Laboratory, Tallahassee, FL-32310, USA.
    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory FSU
    • National High Magnetic Field Lab, Florida State University, Tallahassee, USA
    • NHMFL