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Chin. Phys. B, 2021, Vol. 30(9): 097501    DOI: 10.1088/1674-1056/ac0e25
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Magnetic dynamics of two-dimensional itinerant ferromagnet Fe3GeTe2

Lijun Ni(倪丽君)1, Zhendong Chen(陈振东)1,5, Wei Li(李威)1, Xianyang Lu(陆显扬)1, Yu Yan(严羽)1, Longlong Zhang(张龙龙)1, Chunjie Yan(晏春杰)2, Yang Chen(陈阳)2, Yaoyu Gu(顾耀玉)2, Yao Li(黎遥)1, Rong Zhang(张荣)1, Ya Zhai(翟亚)3, Ronghua Liu(刘荣华)2,†, Yi Yang(杨燚)1,‡, and Yongbing Xu(徐永兵)1,4,§
1 Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China;
2 Jiangsu Provincial Key Laboratory for Nanotechnology, School of Physics, Nanjing University, Nanjing 210093, China;
3 Department of Physics, Southeast University, Nanjing 211189, China;
4 York-Nanjing Joint Centre for Spintronics and NanoEngineering, Department of Electronic Engineering, University of York, York YO10 5DD, United Kingdom;
5 Jiangsu Key Laboratory of Opto-Electronic Technology, Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
Abstract  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.
Keywords:  two-dimensional ferromagnet      ferromagnetic resonance      magnetic anisotropy      magnetic damping  
Received:  13 May 2021      Revised:  17 June 2021      Accepted manuscript online:  24 June 2021
PACS:  75.50.-y (Studies of specific magnetic materials)  
  76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)  
  75.30.Gw (Magnetic anisotropy)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant Nos. 11774150, 12074178, 61427812, 11774160, 61805116, and 61271077), and the Natural Science Foundation of Jiangsu Province of China (Grant Nos. BK20192006, BK20180056, and BK20200307).
Corresponding Authors:  Ronghua Liu, Yi Yang, Yongbing Xu     E-mail:  rhliu@nju.edu.cn;malab@nju.edu.cn;ybxu@nju.edu.cn

Cite this article: 

Lijun Ni(倪丽君), Zhendong Chen(陈振东), Wei Li(李威), Xianyang Lu(陆显扬), Yu Yan(严羽), Longlong Zhang(张龙龙), Chunjie Yan(晏春杰), Yang Chen(陈阳), Yaoyu Gu(顾耀玉), Yao Li(黎遥), Rong Zhang(张荣), Ya Zhai(翟亚), Ronghua Liu(刘荣华), Yi Yang(杨燚), and Yongbing Xu(徐永兵) Magnetic dynamics of two-dimensional itinerant ferromagnet Fe3GeTe2 2021 Chin. Phys. B 30 097501

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