Anomalous spin dynamics in a two-dimensional magnet induced by anisotropic critical fluctuations

We investigate the temperature dependence of g factor in two-dimensional (2D) ferromagnet CrSiTe(3 )by combining three-dimensional vector-ferromagnetic resonance (FMR) experiments. It is shown from the angular dependence that the dramatic g shift near critical temperature originates from the interplay of enhanced magnetic fluctuations and anisotropic spin interactions in 2D magnetism. The crossover from isotropic to anisotropic g factor for T -> T-c yields anomalously parallel pumped excitations. In the critical regime, the field suppression of critical fluctuations is associated with the field dependence of g shift. Furthermore, the results of FMR g shift are scaled by susceptibilities and spontaneous magnetization obtained from magnetometry measurements, which show good agreement with the universality class of the 2D Ising model.

Automated summary

The temperature dependence of the g factor in 2D ferromagnet CrSiTe(3) is investigated through three-dimensional vector-ferromagnetic resonance experiments. The dramatic g shift near the critical temperature is shown to originate from the interplay of enhanced magnetic fluctuations and anisotropic spin interactions in 2D magnetism.