Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 48: Spin Dynamics and Transport: Spin Excitations and Spin Torque Phenomena
MA 48.6: Talk
Thursday, March 23, 2017, 10:45–11:00, HSZ 101
Temperature dependent magnon polariton spectroscopy in YIG sphere — •Isabella Boventer1, Marco Pfirrmann2, Martin Weides1,2, and Mathias Kläui1 — 1Institute of Physics, Johannes Gutenberg-Universität Mainz, 55128 Mainz — 2Institute of Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe
For information technology, the spin based approach is a promising candidate for new applications such as data storage and communication. The collective excitation of a spin ensemble results in a spin wave in the microwave (GHz) regime, termed magnon. Experimentally, we interface magnons with microwave cavities to investigate the dynamics within the magnetic system. The sample is a millimetre sized YIG sphere, placed in the 6.5 GHz bright mode of a reentrant cavity. The magnonic elements are strongly coupled to the photonic resonator, resulting in hybridized magnon-resonator states, called magnon polaritons. We have set up an experimental apparatus for the resonant coupling of spin waves in a magnetic bulk or thin film to either inside a microwave cavity or a coplanar waveguide (CPW) in the strong coupling regime [1,2]. This enables both readout at a fixed frequency or broadband measurements employing ferromagnetic resonance (FMR) and input-output theory for temperatures from 5 K to 300 K. We present temperature dependent spectroscopic measurements of the magnon-polariton states. Features of the strongly coupled such as the coupling strength g and linewidth are discussed. [1] Y. Tabuchi, et al., Phys. Rev. Lett. 113, 083603 (2014) [2] X. Zhang, et al., Phys. Rev. Lett 113, 156401 (2014)