Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 61: Skyrmion Dynamics

MA 61.5: Vortrag

Freitag, 24. März 2017, 10:30–10:45, HSZ 401

Short Wavelength Magnons in Magnetic Vortex StructuresGeorg Dieterle1, •Johannes Förster1, Ajay Gangwar2, Markus Weigand1, and Sebastian Wintz3,41Max-Planck-Institut für Intelligente Systeme, Stuttgart — 2Universität Regensburg — 3Paul Scherrer Institut, Villigen, Schweiz — 4Helmholtz Zentrum Dresden-Rossendorf

In recent years magnonics has become one of the prime topics in magnetics research. The prospect of possible technological applications has played a major part in this development. The reliable generation of spin waves with short wavelengths is an ongoing challenge in this field, as it is difficult by means of a patterned stripline antenna. Here we report on the imaging of spiral shaped short wavelength spin waves emitted by a magnetic vortex core in a permalloy disc. We take advantage of the magnetic perturbation generated by the small moving core, 10-20nm in diameter, to generate spin waves of sub-100nm wavelength. Imaging of these waves has been done using Time-Resolved Scanning Transmission X-Ray Microscopy at the MAXYMUS endstation of the BESSY II synchrotron facility [1]. The experimentally derived dispersion relations match with analytical expressions for hybridized modes between Damon-Eshbach and exchange dominated magnons in infinite ferromagnetic films. This holds as well for our micromagnetic simulations in these vortex structures.

M. Noske et al., J. Appl. Phys. 119, 173901 (2016)

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