Snell's law for spin waves at a 90° magnetic domain wall

Tomosato Hioki, Rei Tsuboi, Tom H. Johansen, Yusuke Hashimoto, Eiji Saitoh

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We report the experimental observation of the refraction and reflection of propagating magnetostatic spin waves crossing a 90° domain wall (DW). Time-resolved magneto-optical imaging was used to observe the propagation dynamics of magnetostatic spin waves. Due to the magnetization rotation across such a DW, the dispersion relation of magnetostatic spin waves rotates by 90°. This results in a change in the propagation dynamics of spin waves on both sides of the DW. We observed the refraction and reflection of magnetostatic spin waves at the DW and reveal their characteristics that include negative refraction. The incident-angle dependence of the refraction angle is explained by the wavenumber conservation along the DW, quite similar to the case of Snell's law for light.

Original languageEnglish
Article number112402
JournalApplied Physics Letters
Issue number11
Publication statusPublished - 2020 Mar 16

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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