2024/09/18 by Xuhui Su, Su, Xuhui, Shaojie Hu +2
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Geophysics and Sensor Technology #Magnetic Properties and Applications
paper · pdf · doi:10.48550/arxiv.2409.11674
openalex publication_date 2024/09/18 · openalex created_date 2024/10/25 · openalex updated_date 2026/07/28
Spin waves (SWs) and their quanta, magnons, are essential to achieving low-power information transmission in future spintronic devices. Backward volume magnetostatic spin waves (BVMSWs) exhibit a unique dispersion relationship: one frequency corresponding to two distinct wave vectors. At low wave numbers, dipole-dipole interactions dominate, resulting in negative group velocities, whereas at high wave numbers, exchange interactions prevail, producing positive group velocities. This dual behavior complicates wave vector identification and obscures intrinsic spin-wave interactions. In this study, we propose an approach based on the spin wave Doppler effect to effectively distinguish different wave vectors. At low wave numbers, the inverse Doppler effect occurs due to antiparallel phase and group velocities, while at high wave numbers, a normal Doppler effect emerges from parallel velocities. This method not only clarifies the underlying spin-wave interactions but also help mitigate serious interference issues in the design of spin logic circuits.