论文标题
Kagome Ferromagnet Fe $ _3 $ sn $ _2 $中的自旋波袋：传播和前体
Spin wavepackets in the Kagome ferromagnet Fe$_3$Sn$_2$: propagation and precursors
论文作者
论文摘要
磁有序系统中自旋波的传播已成为一种潜在的手段，可以在大距离内穿梭量子信息。通常，假定距离$ D $的自旋波袋的到达时间由其组速度（$ v_g $）确定。我们报告了Kagome Ferromagnet Fe $ _3 $ sn $ _2 $中波袋传播的时间分辨的光学测量值，该$ _2 $有时表明旋转信息的到来有时大大低于$ d/v_g $。我们表明，这种自旋波“前体”源自光的相互作用与Fe $ _3 $ sn $ _2 $的磁静态模式的异常频谱的相互作用。相关效应可能会在铁磁和抗铁磁系统中实现长期，超快自旋波传输的影响深远。
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.
