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arXiv · 2102.11713

Tunable Cooperativity in Coupled Spin--Cavity Systems

Lukas Liensberger·Franz X. Haslbeck·Andreas Bauer·Helmuth Berger·Rudolf Gross·Hans Huebl·Christian Pfleiderer·Mathias Weiler
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Abstract

We experimentally study the tunability of the cooperativity in coupled spin--cavity systems by changing the magnetic state of the spin system via an external control parameter. As model system, we use the skyrmion host material Cu$_2$OSeO$_3$ coupled to a microwave cavity resonator. In the different magnetic phases we measure a dispersive coupling between the resonator and the magnon modes and model our results by using the input--output formalism. Our results show a strong tunability of the normalized coupling rate by magnetic field, allowing us to change the magnon--photon cooperativity from 1 to 60 at the phase boundaries of the skyrmion lattice state.

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Lukas Liensberger, Franz X. Haslbeck, Andreas Bauer, Helmuth Berger, Rudolf Gross, Hans Huebl, Christian Pfleiderer, Mathias Weiler. 2021-02-23. Tunable Cooperativity in Coupled Spin--Cavity Systems. https://doi.org/10.1103/physrevb.104.l100415

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