Two-magnon frequency-pulling effect in ferromagnetic resonance
W. K. Peria (1), H. Yu (2), S. Lee (2, 3), I. Takeuchi (2), and P., A. Crowell (1) ((1) University of Minnesota, Minneapolis, MN, USA, (2), University of Maryland, College Park, MD, USA, (3) Pukyong National, University, Busan, South Korea)
TL;DR
This paper experimentally demonstrates how two-magnon scattering causes a frequency-pulling effect in ferromagnetic resonance, affecting the resonance field dependence and requiring correction for accurate data interpretation.
Contribution
It introduces the observation of two-magnon frequency-pulling in thin films and provides a method to account for it using existing scattering parameters.
Findings
Two-magnon scattering causes hybridization with uniform FMR mode.
Frequency-pulling affects the FMR field dependence on frequency.
Correcting for frequency shifts improves data fitting across different orientations.
Abstract
We report the experimental observation in thin films of the hybridization of the uniform ferromagnetic resonance mode with nonuniform magnons as a result of the two-magnon scattering mechanism, leading to a frequency-pulling effect on the ferromagnetic resonance. This effect, when not properly accounted for, leads to a discrepancy in the dependence of the ferromagnetic resonance field on frequency for different field orientations. The frequency-pulling effect is the complement of the broadening of the ferromagnetic resonance lineshape by two-magnon scattering and can be calculated using the same parameters. By accounting for the two-magnon frequency shifts through these means, consistency is achieved in fitting data from in-plane and perpendicular-to-plane resonance conditions.
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