Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Magnetization Dynamics III of 3
MA 49.3: Talk
Friday, March 15, 2013, 10:00–10:15, H22
Left-right symmetry breaking of spin wave propagation in magnetic tubes — •Attila Kákay1, Ming Yan2, and Riccardo Hertel3 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Deutschland — 2Shanghai University, Shanghai, China — 3IPCMS, CNRS UMR 7504, Strasbourg, France
A recent micromagnetic study [1] predicted chiral symmetry breaking of domain wall (DW) dynamics in magnetic nanotubes. This striking behavior arises from the curvature of the magnetic surface. In this investigation based on our micromagnetic finite-element code TetraMag [2], we show that the curvature of the tube surface does not only affect the DW motion, but has also a significant effect on the spin wave propagation. We observe a left-right symmetry break in the propagation of Damon-Eshbach type spin waves. The waves are excited by applying locally a monochromatic high-frequency magnetic field. We find that in tubular geometries with purely azimuthal magnetization, spin waves with the same frequency, surprisingly, display different wavelengths when propagating to the left or to the right. Therefore, the magnon dispersion relation of magnetic tubes does not only depend on the wave number, but also on its sign. Our systematic micromagnetic analysis shows that this effect is scale-invariant and that it originates from the magnetostatic interaction. We conclude that this is a general property of ferromagnetic curved surfaces and tubes.
[1] M. Yan, C. Andreas, A. Kákay, F. Garcia-Sanchez and R. Hertel, Appl. Phys. Lett. 100 252401 (2012) [2] A. Kákay, E. Westphal and R. Hertel, IEEE Trans. Magn. 46 2303 (2010)