Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.34: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Gilbert damping of magnetostatic modes in yttrium iron garnet spheres — •Stefan Klingler1,2, Hannes Maier-Flaig1,2, Carsten Dubs3, Oleskii Surzhenko3, Rudolf Gross1,2,4, Hans Huebl1,2,4, Sebastian T.B. Goennenwein1,5,6, and Mathias Weiler1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, TU München, Garching, Germany — 3INNOVENT e.V. Technologieentwicklung, Jena, Germany — 4Nanosystems Initiative Munich, München, Germany — 5Institut für Festköperphysik, TU Dresden, Dresden, Germany — 6Center for Transport and Devices of Emergent Materials, TU Dresden, Germany
The ferrimagnetic insulator yttrium iron garnet (YIG) has numerous applications in fundamental research due to its low intrinsic Gilbert damping. Recently, strong coupling between magnon modes in YIG spheres and photonic modes in microwave resonators gained interest for quantum information conversion. To this end, the detailed knowledge of damping in the magnetic system plays a crucial role. Here, we investigate the magnetostatic mode (MSM) spectrum of a 300 µm diameter YIG sphere using broadband ferromagnetic resonance. The measured data allows to separate Gilbert damping and inhomogeneous line broadening of the MSMs. One and the same Gilbert damping parameter α=2.7(5)×10−5 is found for all MSMs. However, the inhomogeneous line broadening differs between the investigated MSMs, which is explained by two-magnon scattering processes of the MSMs into the spin-wave manifold, mediated by surface and volume defects.