Cavity-mediated superconductor$\unicode{x2013}$ferromagnetic insulator coupling

Abstract

A recent proof of concept showed that cavity photons can mediate superconducting (SC) signatures to a ferromagnetic insulator (FI) over a macroscopic distance [Phys. Rev. B, 102, 180506(R) (2020)]. In contrast with conventional proximity systems, this facilitates long-distance FI$\unicode{x2013}$SC coupling, local subjection to different drives and temperatures, and studies of their mutual interactions without proximal disruption of their orders. Here we derive a microscopic theory for these interactions, with an emphasis on the leading effect on the FI, namely, an induced anisotropy field. In an arbitrary practical example, we find an anisotropy field of $14 \unicode{x2013} 16$ $\mu$T, which is expected to yield an experimentally appreciable tilt of the FI spins for low-coercivity FIs such as Bi-YIG. We discuss the implications and potential applications of such a system in the context of superconducting spintronics.

17 pages, 8 figures

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Cited by in corpus (4)

• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Strong photon coupling to high-frequency antiferromagnetic magnons via topological surface states
• Dichroic cavity mode splitting and lifetimes from interactions with a ferromagnetic metal
• Observation of Purcell Effect in Electrically Coupled Cavity-Magnet System