Spin wavepackets in the Kagome ferromagnet FeSn: propagation and precursors
arXiv:2212.02498 · doi:10.1073/pnas.2220589120
Abstract
The propagation of spin waves in magnetically ordered systems has emerged as a potential means to shuttle quantum information over large distances. Conventionally, the arrival time of a spin wavepacket at a distance, , is assumed to be determined by its group velocity, . He we report time-resolved optical measurements of wavepacket propagation in the Kagome ferromagnet FeSn that demonstrate the arrival of spin information at times significantly less than . We show that this spin wave "precursor" originates from the interaction of light with the unusual spectrum of magnetostatic modes in FeSn. Related effects may have far-reaching consequences toward realizing long-range, ultrafast spin wave transport in both ferromagnetic and antiferromagnetic systems.
arXiv comment17+12 pages, 5+4 figures
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