Ultra-long spin relaxation in two-dimensional ferromagnet Cr2Ge2Te6 flake

doi:10.1088/2053-1583/ac2ab3

	Ultra-long spin relaxation in two-dimensional ferromagnet Cr2Ge2Te6 flake
	Sun, Tao 1,3; Zhou, Chun 1; Jiang, Zhongzhu 2,3; Li, Xiaoming 1; Qiu, Kang 4,5; Xiao, Ruichun 4,5; Liu, Caixing 1,3; Ma, Zongwei 1; Luo, Xuan 2; Sun, Yuping 1,2,6
刊名	2D MATERIALS
	2021-10-01
卷号	8
关键词	ultrafast spin dynamics 2D van der Waals magnets demagnetization remagnetization dimensionality thermal diffusion anisotropy
ISSN号	2053-1583
DOI	10.1088/2053-1583/ac2ab3
通讯作者	Xiao, Ruichun(xiaoruichun@ahu.edu.cn) ; Sheng, Zhigao(zhigaosheng@hmfl.ac.cn)
英文摘要	By utilizing time-resolved magneto-optical Kerr effect technique, we investigated both demagnetization and remagnetization processes of a typical two-dimensional (2D) van der Waals (vdW) ferromagnetic (FM) semiconductor Cr2Ge2Te6 (CGT) and two comparative Te-based crystals, i.e. three-dimensional (3D) FM metal Cr3Te4 (CT) and 2D vdW FM metal Fe3GeTe2 (FGT). Different from 3D CT showing one-step laser-induced demagnetization, two-steps demagnetization behavior is dominated in 2D vdW FGT and CGT, which indicates that the 2D vdW magnets have relatively weaker electron-spin coupling. Of particular interest, we discovered an ultra-long remagnetization behavior in the 2D vdW CGT flake. The laser pumping induced spin demagnetization would not recover even in the time scale of 3500 ps (experimental setup limitation). To the best of our knowledge, this is the longest remagnetization process observed so far and it might be one of the particular characterizations of 2D vdW ferromagnet semiconductors. Based on the modified three temperature model, the key roles played by the crystal dimensionality and thermal diffusion anisotropy were revealed in the spin dynamics of 2D vdW magnets. Our findings would not only open the door to the thoroughly understanding of the origin of the magnetism in 2D FM materials but also undoubtedly find suitable applications in spintronics and magnonics devices.
资助项目	National Key R&D Program of China[2017YFA0303603] ; National Key R&D Program of China[2016YFA0401803] ; National Natural Science Foundation of China (NSFC)[U2032218] ; National Natural Science Foundation of China (NSFC)[11574316] ; National Natural Science Foundation of China (NSFC)[11947212] ; National Natural Science Foundation of China (NSFC)[61805256] ; National Natural Science Foundation of China (NSFC)[11904367] ; Plan for Major Provincial Science & Technology Project[202003a05020018] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH011] ; Users with Excellence Program of Hefei Science Center CAS[2021HSC-UE009] ; High Magnetic Field Laboratory of Anhui Province
WOS关键词	WAALS ; DYNAMICS
WOS研究方向	Materials Science
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000708655100001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; Plan for Major Provincial Science & Technology Project ; Key Research Program of Frontier Sciences, CAS ; Users with Excellence Program of Hefei Science Center CAS ; High Magnetic Field Laboratory of Anhui Province
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125629]
专题	中国科学院合肥物质科学研究院
通讯作者	Xiao, Ruichun; Sheng, Zhigao
作者单位	1.Chinese Acad Sci, Anhui Key Lab Condensed Matter Phys Extreme Condi, High Magnet Field Lab, HFIPS, Hefei 230031, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Peoples R China 4.Anhui Univ, Inst Phys Sci, Hefei 230601, Peoples R China 5.Anhui Univ, Inst Informat Technol, Hefei 230601, Peoples R China 6.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Sun, Tao,Zhou, Chun,Jiang, Zhongzhu,et al. Ultra-long spin relaxation in two-dimensional ferromagnet Cr2Ge2Te6 flake[J]. 2D MATERIALS,2021,8.
APA	Sun, Tao.,Zhou, Chun.,Jiang, Zhongzhu.,Li, Xiaoming.,Qiu, Kang.,...&Sheng, Zhigao.(2021).Ultra-long spin relaxation in two-dimensional ferromagnet Cr2Ge2Te6 flake.2D MATERIALS,8.
MLA	Sun, Tao,et al."Ultra-long spin relaxation in two-dimensional ferromagnet Cr2Ge2Te6 flake".2D MATERIALS 8(2021).