Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.62: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Dynamic control of cavity-magnon coupling — •Tim Wolz1, Alexander Stehli1, Andre Schneider1, Isabella Boventer2, Sergey Danilin1, Alexey V. Ustinov1,3, Mathias Kläui2, and Martin Weides1,4 — 1Karlsruhe Insitute of Technology, Karlsruhe, Germany — 2Johannes Gutenberg University, Mainz, Germany — 3National University of Science and Technology MISIS, Moscow, Russia — 4University of Glasgow, United Kingdom
Cavity-magnon-polaritons are hybrid modes consisting of magnon and photon excitations and are expected to pave ways for novel microwave technology based on magnon Rabi oscillations [1]. Static and dynamic control of the coupling strength between these two quasi-particles is imperative for future devices. Such a control is realized with an additional drive tone directly applied to the magnon. Depending on the relative phase and amplitude ratio between the two tones, the coupling strength can be reduced and turned off [2,3]. In our work, as the next step, we are implementing a dynamic control of the coupling on time scales similar to the inverse of the coupling strength. Using a heterodyne detection setup with single-sideband mixing, we are able to apply independent control pulses to magnon and cavity while recording the time resolved cavity response. For instance, for phase and amplitude matched excitations to magnon and cavity, both oscillators will "swing" in-phase and no energy exchange will take place, similarly to coupled mechanical pendula. Stopping one oscillator with another pulse will start the magnon Rabi oscillations again. [1] Zhang et al., PRL (2014); [2] Grigoryan et al., PRB (2018); [3] Boventer et al., in preparation