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arXiv · 1506.06049

Cavity mediated coherent coupling of magnetic moments

N. J. Lambert·J. A. Haigh·S. Langenfeld·A. C. Doherty·A. J. Ferguson
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Abstract

We demonstrate the long range strong coupling of magnetostatic modes in spatially separated ferromagnets mediated by a microwave frequency cavity. Two spheres of yttrium iron garnet are embedded in the cavity and their magnetostatic modes probed using a dispersive measurement technique. We find they are strongly coupled to each other even when detuned from the cavity modes. We investigate the dependence of the magnet-magnet coupling on the cavity detuning $Δ$, and find a $1/Δ$ dependence also characteristic of cavity-coupled superconducting qubits. Dark states of the coupled magnetostatic modes of the system are observed, and ascribed to mismatches between the symmetries of the modes and the drive field.

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N. J. Lambert, J. A. Haigh, S. Langenfeld, A. C. Doherty, A. J. Ferguson. 2015-07-06. Cavity mediated coherent coupling of magnetic moments. https://doi.org/10.1103/physreva.93.021803

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