Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetization and Demagnetization Dynamics III
MA 36.8: Vortrag
Mittwoch, 9. März 2016, 17:00–17:15, H34
Brillouin Light Scattering study of magnon-photon strong coupling in a split-ring resonator / YIG film system — •Stefan Klingler1,2, Hannes Maier-Flaig1,2, Rudolf Gross1,2,3, Can-Ming Hu4, Hans Hübl1,2,3, Sebastian T. B. Goennenwein1,2,3, and Mathias Weiler1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Nanosystems Initiative Munich, Munich, Germany — 4Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada
In coupled microwave resonator/magnetic hybrid systems an anti-crossing of photonic and magnonic dispersions can occur.
Here, we use microfocused Brillouin Light Scattering (BLS) to study this magnon-photon coupling phenomenon. The BLS detection affords us with frequency-resolved detection of magnonic excitations. We employ a lithographically defined split-ring resonator (SRR) loaded with a 3 µm-thick Yttrium Iron Garnet (YIG) film grown by liquid phase epitaxy. We simultaneously record BLS spectra and the microwave transmission (MT) of the hybrid system as a function of external magnetic field magnitude and microwave excitation frequency. From this data, we find strong coupling of the magnonic and photonic modes with a coupling strength of ≈60 MHz at an excitation frequency of ≈5 GHz. Light-polarization dependent measurements confirm that BLS and MT spectroscopy are sensitive to the magnonic and photonic parts of the coupled magnon-photon mode, respectively.