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Robust ferromagnetism in wafer-scale Fe3GaTe2 above room-temperature
Shuxiang Wu1, Zhihao He2, Minghui Gu3
1School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China. wushx3@mail.sysu.edu.cn.
Nature Communications
|December 31, 2024
Summary
Wafer-scale growth of Fe3GaTe2 films shows robust room-temperature ferromagnetism and strong perpendicular magnetic anisotropy. This advancement enables new possibilities for two-dimensional spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Van der Waals (vdW) materials offer unique magnetic properties for spintronics.
- Achieving room-temperature ferromagnetism with perpendicular magnetic anisotropy (PMA) in 2D materials is challenging.
Purpose of the Study:
- To report wafer-scale growth of vdW ferromagnet Fe3GaTe2.
- To investigate its magnetic properties, including Curie temperature (Tc) and PMA.
Main Methods:
- Molecular beam epitaxy (MBE) for wafer-scale growth of Fe3GaTe2 films.
- Characterization of magnetic properties at various film thicknesses.
Main Results:
- Epitaxial Fe3GaTe2 films exhibit robust ferromagnetism with Tc = 420 K and PMA (KU = 6.7 × 10^5 J/m^3) at 300 K for nine-unit-cell films.
- Even one-unit-cell films maintain ferromagnetism (Tc = 345 K) due to strong PMA (KU = 1.8 × 10^5 J/m^3).
- Epitaxial films show enhanced Tc compared to exfoliated flakes, attributed to substrate-induced tensile strain.
Conclusions:
- Wafer-scale synthesis of Fe3GaTe2 with high Tc and PMA is achieved.
- These 2D ferromagnetic films are promising for next-generation spintronic devices.
- The findings represent a significant advancement in 2D magnetism and materials science.
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