Magnetic dynamics of two-dimensional itinerant ferromagnet Fe3GeTe2

• Published in: 中国物理B（英文版） 2021-09, Vol.30 (9), p.577-584
• Main Authors: Lijun Ni, Zhendong Chen, Wei Li, Xianyang Lu, Yu Yan, Longlong Zhang, Chunjie Yan, Yang Chen, Yaoyu Gu, Yao Li, Rong Zhang, Ya Zhai, Ronghua Liu, Yi Yang, Yongbing Xu
• Format: Article
• Language: English
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ac0e25

Among the layered two-dimensional ferromagnetic materials (2D FMs),due to a relatively high TC,the van der Waals(vdW) Fe3GeTe2 (FGT) crystal is of great importance for investigating its distinct magnetic properties.Here,we have carried out static and dynamic magnetization measurements of the FGT crystal with a Curie temperature TC ≈ 204 K.The M-H hysteresis loops with in-plane and out-of-plane orientations show that FGT has a strong perpendicular magnetic anisotropy with the easy axis along its c-axis.Moreover,we have calculated the uniaxial magnetic anisotropy constant (K1)from the SQUID measurements.The dynamic magnetic properties of FGT have been probed by utilizing the high sensitivity electron-spin-resonance (ESR) spectrometer at cryogenic temperatures.Based on an approximation of single magnetic domain mode,the K1 and the effective damping constant (αeff) have also been determined from the out-of-plane angular dependence of ferromagnetic resonance (FMR) spectra obtained at the temperature range of 185 K to TC.We have found large magnetic damping with the effective damping constant αeff ～ 0.58 along with a broad linewidth (ΔHpp ＞ 1000 Oe at 9.48 GHz,H || c-axis).Our results provide useful dynamics information for the development of FGT-based spintronic devices.