Haygood, I.
, Pufall, M.
, Edwards, E.
, Shaw, J.
and Rippard, W.
(2021),
Strong Coupling of an Fe-Co Alloy with Ultralow Damping to Superconducting Co-planar Waveguide Resonators, Journal of Applied Physics, [online], https://doi.org/10.1103/PhysRevApplied.15.054021
(Accessed April 19, 2025)
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Strong Coupling of an Fe-Co Alloy with Ultralow Damping to Superconducting Co-planar Waveguide Resonators
Published
Author(s)
, , Eric R. Edwards, ,
Abstract
We report on the strong coupling between a metallic ferromagnetic Fe75Co25 thin-film patterned element and a range of superconducting Nb half-wavelength co-planar waveguide (CPW) resonators. By varying the volume of the ferromagnet we demonstrate that the coupling rate scales linearly with the square root of the number of spins and achieve a coupling rate over 700 MHz, approaching the ultrastrong coupling regime. Experiments varying the center conductor width while maintaining constant magnetic volume verify that decreasing the center conductor width increases coupling and cooperativity. Our results show that the frequency dependence of the coupling rate is linear with the fundamental and higher-order odd harmonics of the CPW, but with differing efficiencies. The results show promise for scaling planar superconducting resonator-magnetic hybrid systems to smaller dimensions.Citation
Journal of Applied Physics
Volume
15
Issue
5
Pub Type
Journals
Download Paper
Keywords
Superconductivity, magnetism, quantum information science, strong-coupling
Citation
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Created May 11, 2021, Updated April 11, 2025