A group of scientists discovered in 2017 discovered that long-range magnetic order can exist stably at the thickness of atomic layers in two-dimensional (2D) van der Waals (vdW) materials. This important discovery provides an ideal material platform for enabling 2D vdW spintronics devices. In order to build new high-speed spintronics devices, it is necessary to study the ultra-fast spin dynamics of vdW magnetic systems.
Recently, Professors Sheng Zhigao and Luo Xuan of the Hefei Institute of Materials Science (HFIPS) of the Chinese Academy of Sciences (CAS) have discovered the ultra-long spin relaxation behavior of 2D vans in collaboration with Dr. Xiao Ruichun of Anhui University. der Waals Magnetic material All-optical time-resolved magneto-optical Kerr effect technology under high magnetic field.
At the same time, based on a modified three-temperature model, we have clarified the important role of dimensionality and thermal diffusion anisotropy in the spin dynamics of 2DvdW magnets.Related results published in 2D material..
Researchers have used ultra-fast magneto-optical technology to aim for the frontier field of spin dynamics in 2D magnetic materials. High magnetic field Conduct detailed comparative studies on laser-induced spin dynamics of 2DvdW semiconductor Cr2Ge2Te6, 2DvdW Metal Fe3GeTe2, And 3D metal Cr3TeFour.. They found that the regenerative susceptibility of 2D vdW magnetic materials is significantly slower than the regenerative susceptibility of 3D materials after being excited by a femtosecond laser.
“For the first time, Cr2Ge2Te6 Shows ultra-long spin relaxation behavior. That is, there is no obvious recovery of magnetism. Time scale 3500 ps (1 ps = 10)-12 s) After ultra-fast demagnetization, “said Professor Sheng. “This is the most fascinating part of this experiment.”
Based on model analysis and experimental findings, researchers have shown that lattice dimensions and thermal diffusion anisotropy play important roles in the spin dynamics of 2D magnetic materials.
Ultrafast dynamics research not only effectively expands the field of study of 2D magnetism, but also further reveals the dimensional specificity of 2DvdW magnetism, which provides a research base for applications in high-frequency devices.
Tao Sun et al, ultralong spin relaxation of two-dimensional ferromagnet Cr2Ge2Te6 flake, 2D material (2021). DOI: 10.1088 / 2053-1583 / ac2ab3
Chinese Academy of Sciences
Quote: Scientists obtained from https://phys.org/news/2021-10-scientists-phenomenon-ultra-long-October 26, 2021 2D van der Waals Magnetic Materials (2021, October 26) I discovered the phenomenon of ultra-long spin relaxation in (Sun). 2d-van.html
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Scientists have discovered the phenomenon of ultra-long spin relaxation in 2D van der Waals magnetic materials
Source link Scientists have discovered the phenomenon of ultra-long spin relaxation in 2D van der Waals magnetic materials