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Thickness-Dependent Ambient Effects on the Curie Temperatures and Magnetic Domains of Metallic Two-Dimensional Magnets

POSTER

Abstract

The emergent magnetic two-dimensional (2D) materials provide ideal solid-state platforms for a broad range of applications including miniaturized spintronics and magnetoelectric sensors. Owing to the general air sensitivity of 2D magnets, the understanding of ambient effects on 2D magnetism is critical. Apparently, the nature of itinerant ferromagnetism potentially makes metallic 2D magnets insensitive to environmental disturbance. Nevertheless, our systematic study showed that the Curie temperature of metallic 2D Fe3GeTe2 decreases dramatically in the air but thick Fe3GeTe2 exhibits self-protection. Remarkably, we found the air exposure effectively promotes the formation of multiple magnetic domains in 2D Fe3GeTe2, but not in bulk Fe3GeTe2. Our first-principles calculations support the scenario that substrate-induced roughness and tellurium vacancies boost the interaction of 2D Fe3GeTe2 with the air. Our elucidation of the thickness-dependent ambient effects on the Curie temperatures and magnetic domains in 2D magnets provides critical insights for chemically decorating and manipulating 2D magnets.

Presenters

  • Cheng Gong

    University of Maryland, College Park

Authors

  • Ti Xie

    University of Maryland, College Park

  • Yeonghun Lee

    The University of Texas at Dallas

  • Jinling Zhou

    University of Maryland, College Park

  • Alemayehu S. Admasu

    Rutgers, The State University of New Jersey

  • Nagarajan Valanoor

    University of New South Wales

  • John Cumings

    University of Maryland, College Park, University of Maryland, Materials Science and Engineering, University of Maryland, College Park

  • Sang-Wook Cheong

    Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University-New Brunswick, Rutgers Center for Emergent Materials, Rutgers University, Rutgers, The State University of New Jersey, Rutgers University, Department of Physics and Astronomy, Rutgers University, Center for Quantum Materials Synthesis, Rutgers University, Center for Emergent Materials and Department of Physics and Astronomy, Rutgers

  • Ichiro Takeuchi

    University of Maryland, College Park, Department of Materials Science, University of Maryland, Department of Materials Science and Engineering, University of Maryland

  • Kyeongjae Cho

    The University of Texas at Dallas

  • Cheng Gong

    University of Maryland, College Park