Lee, Ji-Eun Yan, Shaohua Oh, Sehoon Hwang, Jinwoong Denlinger, Jonathan D. Hwang, Choongyu Lei, Hechang Mo, Sung-Kwan Park, Se Young Ryu, Hyejin 2024-01-19T08:01:51Z 2024-01-19T08:01:51Z 2024-01-18 2023-12 1530-6984 https://pubs.kist.re.kr/handle/201004/112992 Fe3GaTe2, a recently discovered van der Waals ferromagnet, demonstrates intrinsic ferromagnetism above room temperature, necessitating a comprehensive investigation of the microscopic origins of its high Curie temperature (T-C). In this study, we reveal the electronic structure of Fe3GaTe2 in its ferromagnetic ground state using angle-resolved photoemission spectroscopy and density functional theory calculations. Our results establish a consistent correspondence between the measured band structure and theoretical calculations, underscoring the significant contributions of the Heisenberg exchange interaction (J(ex)) and magnetic anisotropy energy to the development of the high-T-C ferromagnetic ordering in Fe3GaTe2. Intriguingly, we observe substantial modifications to these crucial driving factors through doping, which we attribute to alterations in multiple spin-splitting bands near the Fermi level. These findings provide valuable insights into the underlying electronic structure and its correlation with the emergence of high-T-C ferromagnetic ordering in Fe3GaTe2 English American Chemical Society Electronic Structure of Above-Room-Temperature van der Waals Ferromagnet Fe3GaTe2 Article 10.1021/acs.nanolett.3c03203 1 Nano Letters, v.23, no.24, pp.11526 - 11532 Nano Letters 23 24 11526 11532 N scie scopus 001133458000001 2-s2.0-85180088957 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article MAGNETOCRYSTALLINE ANISOTROPY ENERGY ORDER Fe3GaTe2 room-temperature vander Waals ferromagnet high-T (C) ferromagnet electronic structures Heisenbergexchange interaction magnetic anisotropy energy