Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.61: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Temperature dependence of magnetic damping in yttrium iron garnet spheres — •Hannes Maier-Flaig1,2, Stefan Klingler1,2, Carsten Dubs3, Oleksii Surzhenko3, Mathias Weiler1,2, Sebastian T.B. Goennenwein1,2,4,5, Rudolf Gross1,2,5, and Hans Huebl1,2,5 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Germany — 3INNOVENT e.V. Technologieentwicklung, Jena, Germany — 4Institut für Festköperphysik, Technische Universität Dresden, Germany — 5Nanosystems Initiative Munich, München, Germany
The ferrimagnetic insulator Yttrium iron garnet (YIG) is considered one of the prototypical material systems for applications in spintronics and quantum information processing. In order to predict and optimize the performance of devices, detailed knowledge of the frequency and temperature dependence of the damping in YIG is of key importance. We investigate the microwave absorption spectrum of an YIG sphere as a function of temperature and frequency. We observe the typical magnetostatic magnon modes of a YIG sphere. Above 100 K, their magnetic resonance linewidth scales linearly with temperature and also shows a Gilbert-like linear frequency dependence. At lower temperatures, the linewidth exhibits a characteristic peak that coincides with a non-Gilbert like magnetic resonance damping mechanism. We model the temperature and frequency evolution of the linewidth assuming a slowly relaxing rare-earth impurity and either the Kasuya-LeCraw mechanism or the scattering with optical magnons.