Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.63: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Strong coupling of spin-waves and microwave photons in a 3D cavity — •Julius Krause1, Marco Pfirrmann1, Oliver Hahn1, Andre Schneider1, Sebastian T. Skacel1, Yannick Schön1, Isabella Boventer2, Hannes Rotzinger1, Alexey V. Ustinov1, and Martin Weides1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology — 2Institute of Physics, Johannes Gutenberg University Mainz
The model of magnons describes quantized collective excitations of electron spins in a ferromagnet. The spin precession frequency (Larmor frequency) can be adjusted by tuning an external static magnetic field. An alternating magnetic field perpendicular to the static field drives the spin precession. This field component is generated in a cavity in which the electromagnetic field forms a standing wave at resonance conditions. At matching frequencies, cavity photons are able to excite or de-excite magnons.
We experimentally investigate the dynamics of a hybrid quantum system consisting of microwave photons coupled to a ferromagnet. Our goal is to study single magnon excitations at milliKelvin temperatures.
Our experimental setup employs a sub-millimeter YIG sphere within a 3D microwave cavity in an external magnetic field. The cavity provides a sharp resonance of 3 MHz FWHM at 5.3 GHz. In a static magnetic field of 180 mT, the fundamental uniform magnon mode (Kittel mode) matches the cavity resonance frequency. Initial measurements at room temperature show a strong coupling between the Kittel mode and the cavity mode photons with about 30 MHz coupling strength.