Magnetic dynamics of two-dimensional itinerant ferromagnet Fe3GeTe2

doi:10.1088/1674-1056/ac0e25

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97501-097501.doi: 10.1088/1674-1056/ac0e25

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

收稿日期:2021-05-13 修回日期:2021-06-17 接受日期:2021-06-24 出版日期:2021-08-19 发布日期:2021-08-30
通讯作者: Ronghua Liu, Yi Yang, Yongbing Xu E-mail:rhliu@nju.edu.cn;malab@nju.edu.cn;ybxu@nju.edu.cn
基金资助:
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).

Magnetic dynamics of two-dimensional itinerant ferromagnet Fe₃GeTe₂

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

Received:2021-05-13 Revised:2021-06-17 Accepted:2021-06-24 Online:2021-08-19 Published:2021-08-30
Contact: Ronghua Liu, Yi Yang, Yongbing Xu E-mail:rhliu@nju.edu.cn;malab@nju.edu.cn;ybxu@nju.edu.cn
Supported by:
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).

摘要/Abstract

摘要： Among the layered two-dimensional ferromagnetic materials (2D FMs), due to a relatively high T_C, 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 T_C ≈ 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 (α_eff) 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 T_C. We have found large magnetic damping with the effective damping constant α_eff～ 0.58 along with a broad linewidth (ΔH_pp> 1000 Oe at 9.48 GHz, H||c-axis). Our results provide useful dynamics information for the development of FGT-based spintronic devices.

关键词: two-dimensional ferromagnet, ferromagnetic resonance, magnetic anisotropy, magnetic damping

Abstract: Among the layered two-dimensional ferromagnetic materials (2D FMs), due to a relatively high T_C, 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 T_C ≈ 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 (α_eff) 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 T_C. We have found large magnetic damping with the effective damping constant α_eff～ 0.58 along with a broad linewidth (ΔH_pp> 1000 Oe at 9.48 GHz, H||c-axis). Our results provide useful dynamics information for the development of FGT-based spintronic devices.

Key words: two-dimensional ferromagnet, ferromagnetic resonance, magnetic anisotropy, magnetic damping

中图分类号: (Studies of specific magnetic materials)

75.50.-y

76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance) 75.30.Gw (Magnetic anisotropy)

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[J]. 中国物理B, 2021, 30(9): 97501-097501.

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Magnetic dynamics of two-dimensional itinerant ferromagnet Fe₃GeTe₂

Magnetic dynamics of two-dimensional itinerant ferromagnet Fe₃GeTe₂

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