Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Micro- and Nanostructured Magnetic Materials
MA 37.8: Vortrag
Mittwoch, 22. März 2017, 11:30–11:45, HSZ 401
Collective oscillations of magnetic vortices — •Max Hänze1,2,3, Benedikt Schulte1,3, Christian F. Adolff3,4, Markus Weigand5, and Guido Meier1,3,4 — 1Max-Planck-Institut für Struktur und Dynamik der Materie, Hamburg — 2Max-Planck-Institut für Festkörperforschung, Stuttgart — 3Institut für Angewandte Physik, Universität Hamburg — 4The Hamburg Centre for Ultrafast Imaging, Hamburg — 5Max-Planck-Institut für Intelligente Systeme, Stuttgart
Tailored ferromagnetic structures on micro- to nanometer length scales are promising candidates for future storage and logic devices based on spin-wave excitations. We study collective oscillations of coupled magnetic vortices emerging in micron-sized permalloy disks using two complementary measurement techniques, i.e., scanning transmission X-ray microscopy and ferromagnetic resonance spectroscopy.
Coupled magnetic vortices can exhibit crystal properties, e.g. a dispersion relation and a group velocity [1]. The manipulation of such properties is demonstrated on nanosecond time scales [2] using the excitation of coupled gyrotropic motions and coupled spin-wave modes in closely packed vortex arrangements [3,4].
[1] C. Behncke, M. Hänze, C. F. Adolff, M. Weigand, and G. Meier, Phys. Rev. B 91, 224417 (2015) [2] M. Hänze, C. F. Adolff, M. Weigand, and G. Meier, Phys. Rev. B 91, 104428 (2015) [3] M. Hänze, C. F. Adolff, B. Schulte, J. Möller, M. Weigand, and G. Meier, Sci. Rep. 6, 22402 (2016) [4] M. Hänze, C. F. Adolff, S. Velten, M. Weigand, and G. Meier, Phys. Rev. B 93, 054411 (2016)