Spin wavepackets in the Kagome ferromagnet Fe${}_3$Sn${}_2$: propagation and precursors

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, $d$, is assumed to be determined by its group velocity, $v_g$. He we report time-resolved optical measurements of wavepacket propagation in the Kagome ferromagnet Fe${}_3$Sn${}_2$ that demonstrate the arrival of spin information at times significantly less than $d/v_g$. We show that this spin wave "precursor" originates from the interaction of light with the unusual spectrum of magnetostatic modes in Fe${}_3$Sn${}_2$. Related effects may have far-reaching consequences toward realizing long-range, ultrafast spin wave transport in both ferromagnetic and antiferromagnetic systems.

17+12 pages, 5+4 figures

References in corpus (4)

• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Exciton-Coupled Coherent Magnons in a 2D Semiconductor
• Spin Superfluidity in Biaxial Antiferromagnetic Insulators
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators

Cited by in corpus (3)

• Universal spin wavepacket transport in van der Waals antiferromagnets
• Ring-Exchange Interaction Effects on Magnons in Dirac Magnet CoTiO${}_3$
• High-pressure modulation of breathing kagome lattice: Cascade of Lifshitz transitions and evolution of the electronic structure