Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.62: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Magnon Spectroscopy — •Isabella Boventer1, Martin Weides1,2, and Mathias Kläui1 — 1Institute of Physics, Johannes Gutenberg-Universität Mainz, 55128 Mainz — 2Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe
Within the research in information technology the spin based approach is promising for applications such as data storage, leading to the field of Spintronics. Instead of electrical charge the spin, i.e the magnetic moment of electrons, is utilized. The collective excitation of a spin ensemble results in a spin wave which exhibits a quasiparticle behaviour, termed magnon. We experimentally interface magnons with microwave cavities to investigate dynamics within the magnet. To this end, magnonic elements will be strongly coupled to a resonator, resulting in hybridized magnon - resonator states. Thus, we set up an experiment for the resonant coupling of spin waves in a magnetic bulk or thin film to either a microwave cavity or a coplanar waveguide (CPW) in the strong coupling regime. This will enable both readout at fixed frequency and broadband measurements using network analysis and ferromagnetic resonance (FMR) at various temperatures and magnetic fields.
As a first step we characterized the microwave cavity with and without a YIG sphere ( 0.5 mm ) in order to reproduce previous results [1,2]. At T=300 K, we observe a total coupling strength of 50 MHz at Bdc=502 mT . This is almost five times higher than the magnitude reported in [2].
Tabuchi, et al., Phys. Rev. Lett. 113, 083603 (2014)
Zhang, et al., Phys. Rev. Lett 113, 156401 (2014)