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Magnetism and Its Structural Coupling Effects in 2D Ising Ferromagnetic Insulator VI3.
Lin, Zhong; Huang, Bevin; Hwangbo, Kyle; Jiang, Qianni; Zhang, Qi; Liu, Zhaoyu; Fei, Zaiyao; Lv, Hongyan; Millis, Andrew; McGuire, Michael; Xiao, Di; Chu, Jiun-Haw; Xu, Xiaodong.
Afiliação
  • Lin Z; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Huang B; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Hwangbo K; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Jiang Q; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Zhang Q; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Liu Z; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Fei Z; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
  • Lv H; Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.
  • Millis A; Department of Physics, Columbia University, New York, New York 10027, United States.
  • McGuire M; Center for Computational Quantum Physics, Flatiron Institute, New York, New York 10001, United States.
  • Xiao D; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
  • Chu JH; Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.
  • Xu X; Department of Physics, University of Washington, Seattle, Washington 98195, United States.
Nano Lett ; 21(21): 9180-9186, 2021 11 10.
Article em En | MEDLINE | ID: mdl-34724786
ABSTRACT
van der Waals (vdW) magnets have emerged as a tunable platform for exploring a variety of layer-dependent magnetic phenomena. Here we probe the thickness-dependent magnetism of vanadium triiodide (VI3), a material known as a layered ferromagnetic Mott insulator in its bulk form, using magnetic circular dichroism microscopy. Robust ferromagnetism is observed in all thin layers, down to the monolayer limit with large coercive fields. In contrast to known vdW magnets, the Curie temperature shows an anomalous increase as the layer number decreases, reaching a maximum of 60 K in monolayers. Second harmonic generation measurements reveal broken inversion symmetry in exfoliated flakes, down to trilayers. This observation demonstrates that the exfoliated flakes take a layer stacking arrangement that differed from the inversion-symmetric parent bulk counterpart. Our results suggest a coupling effect between magnetic and structural degrees of freedom in VI3 and its potential for engineering layer and twist angle-dependent magnetic phenomena.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Imãs Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Imãs Idioma: En Ano de publicação: 2021 Tipo de documento: Article