Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Spin Dynamics and Transport: Magnonics
MA 34.7: Vortrag
Mittwoch, 22. März 2017, 11:15–11:30, HSZ 04
Curvature-Induced Asymmetry of Spin-Wave Dispersion — Jorge A. Otálora1, Ming Yan2, Helmut Schultheiss3, Jürgen Lindner3, Jürgen Fassbender3, Riccardo Hertel4, and •Attila Kákay3 — 1Universidad Técnica Federico Santa María, Avenida España 1680, Casilla 110-V, Valparaíso, Chile — 2Shanghai University, 99 Shangda Road, Shanghai 200444, China — 3HZDR, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany — 4IPCMS, UMR 7504, CNRS, and Université de Strasbourg, 23 rue du Loess, F-67034 Strasbourg, France
We show using micromagnetic simulations and analytical calculations that spin-wave propagation in ferromagnetic nanotubes is fundamentally different than in flat thin films. The dispersion relation is asymmetric regarding the sign of the wave vector. This is a purely curvature-induced effect and its fundamental origin is identified to be the classical dipole-dipole interaction. In certain cases the Damon-Eshbach modes in nanotubes behave as the volume-charge-free backward volume modes in flat thin films. Such non-reciprocal spin-wave propagation [1] is known for flat thin films with Dzyalonshiinsky-Moriya interaction (DMI), an antisymmetric exchange due to spin-orbit coupling. The analytical expression of the dispersion relation has the same mathematical form as in flat thin films with DMI. The influence of curvature on spin waves is thus equivalent to an effective dipole-induced Dzyalonshiinsky-Moriya interaction [2]. [1] K. Zakeri, et. al., Phys. Rev. Lett. 104, 137203 (2010). [2] J.A. Otálora, et. al., Phys. Rev. Lett. 117, 227203 (2016).