Magnetic spheres in microwave cavities
Babak Zare Rameshti, Yunshan Cao, and Gerrit E. W. Bauer
TL;DR
This paper uses Mie scattering theory to analyze how magnetic YIG spheres interact with microwaves in cavities, revealing strong and ultra-strong coupling regimes and identifying higher angular momentum eigenmodes.
Contribution
It introduces a theoretical framework beyond common approximations to study microwave-magnetic sphere interactions, highlighting the potential for efficient microwave antennas.
Findings
Strong and ultra-strong coupling regimes identified
Higher angular momentum eigenmodes observed
YIG spheres act as efficient microwave antennas
Abstract
We apply Mie scattering theory to study the interaction of magnetic spheres with microwaves in cavities beyond the magnetostatic and rotating wave approximations. We demonstrate that both strong and ultra-strong coupling can be realized for a stand alone magnetic spheres made from yttrium iron garnet (YIG), acting as an efficient microwave antenna. The eigenmodes of YIG spheres with radii of the order mm's display distinct higher angular momentum character that has been observed in experiments.
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