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MA: Fachverband Magnetismus

MA 28: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions

MA 28.4: Vortrag

Mittwoch, 19. März 2025, 15:45–16:00, H19

High-field/high-frequency Ferromagnetic Resonance Studies on the van-der-Waals ferromagnet Fe₃GeTe₂ — •Birte Beier¹, Martin Jonak¹, Eva Brücher², Reinhard K. Kremer², and Rüdiger Klingeler¹ — ¹Kichhoff Institute for Physics, Heidelberg University, Germany — ²Max Planck Institute for Solid State Research, Stuttgart, Germany

Long-range ferromagnetic order develops down to the monolayer in Fe₃GeTe₂ and is particularly robust both in the monolayer and in the bulk as compared to other van-der-Waals ferromagnets. In the bulk, T_C amounts to about 220 K as compared to, e.g., 61 K in CrI₃ and 65 K in Cr₂Ge₂Te₆. In order to elucidate the origin of robust long-range ferromagnetism, we have investigated low-energy magnon excitations in Fe₃GeTe₂ by high-field/high-frequency ferromagnetic resonance studies. Our data reveal the size and temperature dependence of the anisotropy gap and also show the evolution of short-range magnetic order well above T_C. The frequency- and field-dependence of magnon excitation is discussed and compared with our recent findings on CrI₃ [1].

[1] M. Jonak et al., Phys. Rev. B 106, 214412 (2022)

Keywords: High-Field Ferromagnetic Resonance; van-der-Waals materials; 2D ferromagnets