Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.21: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Tunable magnon-photon coupling in a compensated rare earth garnet – 3D cavity system — •Hannes Maier-Flaig^1,2, Michael Harder³, Stefan Klingler^1,2, Zhiyong Qiu⁴, Eiji Saitoh⁴, Rudolf Gross^1,2, Hans Huebl^1,2, and Sebastian T.B. Goennenwein^1,2 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik - Department, Technische Universität München, Garching, Germany — ³Department of Physics and Astronomy, University of Manitoba, Canada — ⁴Institute for Materials Research, Tohoku University, Sendai, Japan

Strong spin-photon coupling is a major goal in quantum information memory applications, as it allows to coherently exchange information between the photons of a microwave cavity and a paramagnetic spin ensemble. This concept was recently transferred to magnetically ordered systems showing coupling rates of hundreds of megahertz even at room temperatures. Here, we demonstrate strong coupling of a micrometer thick Gd₃Fe₅O₁₂ (GIG) film and a 3D microwave cavity at distinct cryogenic temperatures. By employing a first-principles model of the coupled magnon-photon system, we reliably extract the relevant coupling parameters. The strongly temperature dependent magnetization of GIG (a compensated ferrimagnetic oxide) allows to tune the effective coupling rate of the system over a wide range, solely by changing the temperature. We are therefore able to observe the transition from a strongly coupled system to the weakly coupled regime in which ferromagnetic resonance experiments are usually performed.