Electronic Structure of Above-Room-Temperature van der Waals Ferromagnet Fe3GaTe2

Ji-Eun Lee; Shaohua Yan; Sehoon Oh; Jinwoong Hwang; Jonathan D Denlinger; Choongyu Hwang; Hechang Lei; Sung-Kwan Mo; Se Young Park; Hyejin Ryu

doi:10.1021/acs.nanolett.3c03203

Electronic Structure of Above-Room-Temperature van der Waals Ferromagnet Fe₃GaTe₂

Nano Lett. 2023 Dec 27;23(24):11526-11532. doi: 10.1021/acs.nanolett.3c03203. Epub 2023 Dec 11.

Authors

Ji-Eun Lee^{1

2}, Shaohua Yan^{3

4}, Sehoon Oh⁵, Jinwoong Hwang⁶, Jonathan D Denlinger¹, Choongyu Hwang^{7

8}, Hechang Lei^{3

4}, Sung-Kwan Mo¹, Se Young Park⁵, Hyejin Ryu⁹

Affiliations

¹ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
² Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 37673, Korea.
³ Beijing Key Laboratory of Optoelectronic Functional Materials MicroNano Devices, Department of Physics, Renmin University of China, Beijing 100872, China.
⁴ Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China.
⁵ Department of Physics and Origin of Matter and Evolution of Galaxies (OMEG) Institute, Soongsil University, Seoul 06978, Korea.
⁶ Department of Physics, Kangwon National University, Chuncheon 24341, Korea.
⁷ Department of Physics, Pusan National University, Busan 46241, Korea.
⁸ Quantum Matter Core Facility, Pusan National University, Busan 46241, Korea.
⁹ Center for Spintronics, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea.

PMID: 38079244
DOI: 10.1021/acs.nanolett.3c03203

Abstract

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.

Keywords: Fe3GaTe2; Heisenberg exchange interaction; electronic structures; high-TC ferromagnet; magnetic anisotropy energy; room-temperature van der Waals ferromagnet.