Twisted spin waves in a cylindrical magnonic crystal

• DOI: 10.1063/5.0244585
• Publication Date: 2025-03-06T13:42:01Z
• Authors: Zhixiong Li; Xuejuan Liu; Xiansi Wang; Zhenyu Wang
• Keywords: Spin wave; Crystal (programming language); Magnon

Twisted spin waves (or twisted magnons, TMs) have significant potential in high-capacity communication due to their orbital angular momentum (OAM) degree of freedom. Consequently, manipulating the propagation TMs has become an important topic spintronics. Here, we theoretically study band structures ferromagnetic cylindrical magnonic crystals with periodically modulated anisotropy. We find that arbitrary OAMs exhibit forbidden bands at boundary Brillouin zone, though, different frequency ranges. This unique feature offers a promising avenue for developing filters capable blocking specific OAMs. Furthermore, demonstrate tunability TM bandgaps, as position and width can be easily adjusted by altering magnitude anisotropy or period crystal structure. Full micromagnetic simulations are performed verify theoretical predictions, showing good agreement. Our work not only enhances our understanding characteristics but also paves way design advanced spintronic devices harness magnon OAM