Spin wavepackets in the Kagome ferromagnet Fe<sub>3</sub>Sn<sub>2</sub>: Propagation and precursors.
basic_science · Level V
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- Record sourced from PubMed, PMID 37186856.
- Also identified by DOI 10.1073/pnas.2220589120 and PMC identifier 10214209.
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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, <i>d</i>, is assumed to be determined by its group velocity, <i>v</i><sub><i>g</i></sub>. Here, we report time-resolved optical measurements of wavepacket propagation in the Kagome ferromagnet Fe<sub>3</sub>Sn<sub>2</sub> that demonstrate the arrival of spin information at times significantly less than <i>d</i>/<i>v</i><sub><i>g</i></sub>. We show that this spin wave "precursor" originates from the interaction of light with the unusual spectrum of magnetostatic modes in Fe<sub>3</sub>Sn<sub>2</sub>. Related effects may have far-reaching consequences toward realizing long-range, ultrafast spin wave transport in both ferromagnetic and antiferromagnetic systems.