Article Strain‐Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction

Ryuji Fujita ; Gautam Gurung ; Mohamad‐Assaad Mawass ; Alevtina Smekhova ; Florian Kronast ; Alexander Kang‐Jun Toh ; Anjan Soumyanarayanan ; Pin Ho ; Angadjit Singh ; Emily Heppell ; Dirk Backes ; Francesco Maccherozzi ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Daniel A. Mayoh ; Geetha Balakrishnan ; Gerrit van der Laan ; Thorsten Hesjedal

Adv Funct Materials - 2024 - Fujita - Strain‐Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction.pdf
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Ryuji Fujita, Gautam Gurung, Mohamad‐Assaad Mawass, Alevtina Smekhova, Florian Kronast, Alexander Kang‐Jun Toh, Anjan Soumyanarayanan, Pin Ho, Angadjit Singh, Emily Heppell, Dirk Backes, Francesco Maccherozzi, Kenji Watanabe, Takashi Taniguchi, Daniel A. Mayoh, Geetha Balakrishnan, Gerrit van der Laan, Thorsten Hesjedal. Strain‐Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction. Advanced Functional Materials. 2024, 34 (36), 2400552. https://doi.org/10.1002/adfm.202400552
SAMURAI

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(abstract)

The van der Waals interaction enables thin layers of two-dimensional materials to be interfaced in heterostructures with relaxed epitaxy conditions. However, the ability to freely stack layers without any strain or structural modification is by no means universal. In this work, we utilize the piezoelectricity of α-In2Se3 to modify the magnetic properties of thin layers of the vdW ferromagnet Fe3GeTe2, resulting in increased domain wall density, reductions in the transition temperature ranging from 5 to 20 K, and an increase in the magnetic coercivity. Structural modifications at the atomic level are corroborated by a decrease in the Tuinstra-Koenig ratio, I(D)/I(G) in a graphite/α-In2Se3 heterostructure. Density functional theory calculations show that the Fe3GeTe2 layer is compressively strained by 0.4%. The incorporation of α-In2Se3 may be a general strategy to electrostatically strain interfaces in magnetoelectric vdW heterostructures.

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Keyword: van der Waals interaction, exfoliated 2D materials, magnetic properties

Date published: 2024-03-14

Publisher: Wiley

Journal:

  • Advanced Functional Materials (ISSN: 16163028) vol. 34 issue. 36 2400552

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology
  • Engineering and Physical Sciences Research Council EP/N032128/1
  • Engineering and Physical Sciences Research Council EP/X015793/1
  • Helmholtz-Zentrum Berlin für Materialien und Energie 212‐10475‐ST
  • Diamond Light Source MM31730
  • Ministry of Education - Singapore A18A6b0057
  • Ministry of Education - Singapore A20G9b0135
  • Earth Observatory of Singapore A20G9b0135
  • Japan Society for the Promotion of Science London 21H05233
  • Japan Society for the Promotion of Science London 23H02052
  • Deutsche Forschungsgemeinschaft 328545488

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1002/adfm.202400552

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Updated at: 2025-02-14 12:31:21 +0900

Published on MDR: 2025-02-14 12:31:21 +0900

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