Recent research has revealed remarkable properties of the two-dimensional (2D) van der Waals layered crystal CrSBr, which is both a semiconductor and an A-type antiferromagnet. Here we show the role of strong magnetoelastic coupling in the generation and propagation of coherent magnons in CrSBr. Time and spatially resolved magneto-optical Kerr effect (tr-MOKE) microscopy reveals two time-varying transient strain fields induced by out-of-plane transverse and in-plane longitudinal lattice displacements. These transient strain fields launch coherent wavepackets of magnons, optical and acoustic at 24.6 GHz and 33.4 GHz, respectively. These findings suggest mechanisms for controlling and manipulating coherent magnons from distinct magnetoelastic couplings in this 2D van der Waals magnetic semiconductor.
@article{arxiv.2401.07828,
title = {Transient Magnetoelastic Coupling in CrSBr},
author = {Youn Jue Bae and Taketo Handa and Yanan Dai and Jue Wang and Huicong Liu and Allen Scheie and Daniel G. Chica and Michael E. Ziebel and Andrew D. Kent and Xiaodong Xu and Ka Shen and Xavier Roy and Xiaoyang Zhu},
journal= {arXiv preprint arXiv:2401.07828},
year = {2024}
}