Electronic structure of above-room-temperature van der Waals ferromagnet Fe${}_3$GaTe${}_2$

Abstract

Fe${}_3$GaTe${}_2$, 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 ($\text{T}$${}_C$). In this study, we reveal the electronic structure of Fe${}_3$GaTe${}_2$ in its ferromagnetic ground state using angle-resolved photoemission spectroscopy and density functional theory calculations. Our results establish a consistent correspondence between the measured band structure and theoretical calculations, underscoring the significant contributions of the Heisenberg exchange interaction ($\text{J}$${}_{ex}$) and magnetic anisotropy energy to the development of the high-$\text{T}$${}_C$ ferromagnetic ordering in Fe${}_3$GaTe${}_2$. Intriguingly, we observe substantial modifications to these crucial driving factors through doping, which we attribute to alterations in multiple spin-splitting bands near the Fermi level. These findings provide valuable insights into the underlying electronic structure and its correlation with the emergence of high-$\text{T}$${}_C$ ferromagnetic ordering in Fe${}_3$GaTe${}_2$.

25 pages, 4 figures

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Cited by in corpus (1)

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