Ferrimagnetic ground state in Fe3GaTe2 and its influence on its skyrmions.

ORAL

Abstract

The recently discovered layered ferromagnet Fe3GaTe2 is attracting significant attention due to its high Curie temperature, low dimensionality, and the presence of topological spin textures even above room temperature, which makes Fe3GaTe2 a good candidate for applications in spintronics. However, a precise determination of its magnetic ground state and an understand of the mechanisms stabilizing skyrmions is essential. We found that Fe3GaTe2 displays a metastable ferromagnetic (FM) state but a stable ferrimagnetic (FiM) ground state, and no glassiness as claimed for sister compounds. Evidence for a topological Hall effect and skyrmions are observed at the boundary between FM and FiM phases according to magnetic force microscospy, implying that competing magnetic interactions play a crucial role in their formation. Furthermore, we found a coincidence between the thermal hysteresis observed in the magnetization, that is associated with the competition between FM and FiM phases, and thermal hysteresis in the skyrmion density measured through Lorentz transmission electron microscopy. AC magnetic susceptibility, singe-crystal X-ray diffraction, and high-resolution transmission electron microscopy images will be discussed in an attempt to correlate the presence of spin textures with the actual crystal structure.

*L.B. acknowledges support from the US DoE, BES program through award DE-SC0002613 US (synthesis and measurements), US-NSF-DMR 2219003 (heterostructure fabrication) and the Office Naval Research DURIP Grant 11997003 (stacking under inert conditions). J.Y.C acknowledges NSF DMR-2209804 and the Welch Foundation through AA-2056-20220101. The National High Magnetic Field Laboratory acknowledges support from the US-NSF Cooperative agreement Grant numbers DMR-1644779 and DMR-2128556, and the state of Florida. Work at Argonne (Y.L, C.P) was funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Science and Engineering Division. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Jeehoon Kim acknowledges the support from the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSTI) (No. RS-2024-00410027). Jaeyong Kim acknowledges the support from the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSTI) (No. 2022H1D3A3A01077468).

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Presenters

  • Sang-Eon Lee

    • National High Magnetic Field Laboratory

Authors

  • Sang-Eon Lee

    • National High Magnetic Field Laboratory

  • Yue Li

    • Argonne National Laboratory

  • Yeonkyu Lee

    • Pohang University of Science and Technology

  • Kice Brown

    • Baylor University

  • Gregory T McCandless

    • Baylor University

  • Alex J Moon

    • National High Magnetic Field Laboratory

  • Lingrui Mei

    • National High Magnetic Field Laboratory

  • Jaeyoung Kim

    • Hanyang University

  • Julia Y Chan

    • Baylor Univeristy
    • Baylor University
    • Balor University

  • Jeehoon Kim

    • Pohang University of Science and Technology

  • Charudatta M Phatak

    • Argonne National Laboratory

  • Vadym Kulichenko

    • Florida State University
    • National High Magnetic Field Laboratory

  • Luis M Balicas

    • National High Magnetic Field Laboratory
    • Florida State University, National High Magnetic Field Laboratory