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날짜 2023-01-12 16:00 
장소 E6-2 #1323 
연사 Changmin Lee (Lawrence Berkeley National Laboratory) 

물리학과 이경진 교수님 연구실에서 아래와 같이 세미나를 개최합니다.

구성원 여러분들의 많은 관심과 참여 부탁 드립니다. 


* Title: Spin wavepackets in the Kagome ferromagnet Fe3Sn2: propagation and precursors


* Speaker: Changmin Lee (Lawrence Berkeley National Laboratory)


* Date: 4pm, 12th January 2023


* Place: E6-2 1323



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, vg. He we report time-resolved optical measurements of wavepacket propagation in the Kagome ferromagnet Fe3Sn2 that demonstrate the arrival of spin information at times significantly less than d/vg. We show that this spin wave "precursor" originates from the interaction of light with the unusual spectrum of magnetostatic modes in Fe3Sn2 [1]. Related effects may have far-reaching consequences toward realizing long-range, ultrafast spin wave transport in both ferromagnetic and antiferromagnetic systems.


[1] C. Lee et al., arXiv:2212.02498 (2022)


Contact: Kyung Jin Lee ( 

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