English, L.Q., C. Kerestes, and G. Rydzag [i.e. Rydzak]. Renormalized Resonance Frequencies of a Ferrite Sphere Coupled to an LR Circuit: Comparison of Theory and Experiment. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 24, no. 1 (2005): 39-45.

For more information on the published version, visit Wiley's Website. Rydzak spelled incorrectly as Rydzag in publication.

We derive a formula for the AC susceptibility of a ferrite spherical resonator coupled to an LR circuit by formulating the problem in terms of a feedback mechanism. This technique allows us to find an analytical expression for the dependence of the shift in resonance frequency on the loop-crystal coupling strength, the circuit parameters, and the saturation magnetization of the ferrite. Finally, we compare these predictions to experimental results on YIG and Ga:YIG spheres. This coupling provides a simple way of tuning the uniform mode frequency relative to the spin-wave spectrum.

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