Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.43: Poster

Friday, March 15, 2013, 10:30–13:30, Poster D

Azimuthal Spin-Wave Modes in Permalloy Coated Glass Fibers — •Lukas Nagrodzki, Felix Balhorn, Wolfgang Hansen, and Stefan Mendach — Institut für Angewandte Physik, Universität Hamburg, Germany

We show by means of broadband microwave spectroscopy that Permalloy cylinders with micron-sized diameters exhibit pronounced azimuthal spin-wave modes, which can be tuned over several GHz by an external magnetic field. For the preparation of these devices we have deposited thin layers of Permalloy on glass fibers with diameters of a few microns by thermal evaporation. They show resonant behavior with multiple resonances when magnetized along the fiber axis. We interpret those resonances as interfering spin waves propagating in azimuthal direction. The data can be well reproduced using an analytical model for spin waves in thin films employing periodic boundary conditions as also used for rolled-up Permalloy spin-wave resonators previously introduced by our group [1, 2].

Financial support by the Deutsche Forschungsgemeinschaft via SFB668 is acknowledged.

[1] F. Balhorn et al., PRL 104, 037205 (2010); [2] F. Balhorn et al., APL 100, 222402 (2012)