凝聚态物理
消磁场
材料科学
范德瓦尔斯力
磁性
自旋(空气动力学)
铁磁性
半导体
各向异性
磁化
自旋电子学
物理
光学
磁场
光电子学
热力学
量子力学
分子
作者
Tao Sun,Chun Zhou,Zhaozhong Jiang,Xiaoming Li,Kang Qiu,Rui-Chun Xiao,Caixing Liu,Zongwei Ma,X. Luo,Yan Sun,Zhigao Sheng
出处
期刊:2D materials
[IOP Publishing]
日期:2021-10-01
卷期号:8 (4): 045040-045040
被引量:5
标识
DOI:10.1088/2053-1583/ac2ab3
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.
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