Induced Ultrafast Spin Dynamics Green Laser Pointer Research Progress

Pulsed laser-induced ultrafast spin kinetics can provide a powerful means for studying antiferromagnetic materials. Ultrafast pulsed laser pumping detection methods have superfast spin dynamics in magnetic films due to femtosecond time resolution. It has been widely used in research. In recent years, new advances in ultrafast photomagnetic excitation and multiferroic work have spurred the re-exploration of the ultrafast magneto-optical effect of rare earth-iron oxides.

Recently, Cheng Zhaohua, the State Key Laboratory of Magnetics, Institute of Physics, Chinese Academy of Sciences/Beijing National Center for Condensed Matter Physics, studied the ultrafast magnetic kinetics of Fe/ErFeO3(100) and Fe/DyFeO3(100) heterostructures. . It was found that covering the Fee film on the RFeO3 (100) single crystal substrate can significantly enhance the efficiency of the optically pumped antiferromagnetic ferrite.

The team used the all-optical pump-detection technique to not only observe the quasi-ferromagnetic (Q-FM) pattern that was observed only in the vicinity of the spin reorientation temperature zone in the past plenoptic method, but also observed that it has not been reported yet. Phonon mode. The analysis indicates that the enhancement of the antiferromagnetic ultrafast spin kinetics of the optically pumped RFeO3 is attributed to the change of the light-to-heterojunction interface exchange coupling. This provides a basis for further study of the ultra-fast pulse green laser pointer clause anti-ferromagnetic material spin dynamics. Related research results have recently been published on Advance Materials.