2017/12/09 by Lixiang Wang, Leisen Gao, Wang, Lixiang +13
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #Applied Physics (physics.app-ph) #FOS: Physical sciences #Magnetic properties of thin films #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.1712.03392
openalex publication_date 2017/12/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose to use a soft/hard exchange-spring coupling bilayer magnetic structure to introduce a narrow channel for spin-wave propagation. We show by micromagnetic simulations that broad-band Damon-Eshbach geometry spin waves can be strongly localized into the channel and propagate effectively with a proper high group velocity. The beamwidth of the bound mode spin waves is almost independent from the frequency and is smaller than 24nm. For a low-frequency excitation, we further investigate the appearance of two other spin beams in the lateral of the channel. In contrast to a domain wall, the channel formed by exchange-spring coupling can be easier to realize in experimental scenarios and holds stronger immunity to surroundings. This work is expected to open new possibilities for energy-efficient spin-wave guiding as well as to help shape the field of beam magnonics.