Transient Magnetoelastic Coupling in CrSBr
arxiv(2024)
摘要
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.
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