Details

Autor(en) / Beteiligte

• Goto, Yutaro
• Ishihara, Hajime
• Yokoshi, Nobuhiko

Titel

Dispersion relation of spin wave in chiral helimagnet under stationary optical vortex radiation

Ist Teil von

• Japanese Journal of Applied Physics, 2021-09, Vol.60 (9), p.98001

Ort / Verlag

Tokyo: IOP Publishing

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract We investigate a dispersion relation of a spin wave of an effectively one-dimensional chiral helimagnet CrNb 3 S 6 , which is under stationary radiation of a resonant optical vortex beam coaxial to that spiral magnetic order axis. We derive a classical magnetic structure by solving Landau–Lifshitz–Gilbert equation and calculate the collective excitation on it. We show that the optical vortex radiation makes the energy gap at k ∼ 0, and the exceptional points appear in the dispersion relation. Because such a dispersion relation implies the dynamical properties with instability, our result implies a possibility to control spin wave transport.