Large angle magnetization dynamics measured by time-resolved ferromagnetic resonance

A time-resolved ferromagnetic resonance technique was used to investigate the magnetization dynamics of a 10 nm thin Permalloy film. The experiment consisted of a sequence of magnetic field pulses at a repetition rate equal to the magnetic systems resonance frequency. We compared data obtained by th...

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Bibliographic Details
Published in:arXiv.org 2005-08
Main Authors: Gerrits, Th, Schneider, M L, Kos, A B, Silva, T J
Format: Article
Language:English
Subjects:
Damping
Ferromagnetic resonance
Ferromagnetism
Ferrous alloys
Frequency response
Incoherence
Magnetic alloys
Magnetic measurement
Magnetism
Magnetization
Nonlinear response
Nonlinearity
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Summary:A time-resolved ferromagnetic resonance technique was used to investigate the magnetization dynamics of a 10 nm thin Permalloy film. The experiment consisted of a sequence of magnetic field pulses at a repetition rate equal to the magnetic systems resonance frequency. We compared data obtained by this technique with conventional pulsed inductive microwave magnetometry. The results for damping and frequency response obtained by these two different methods coincide in the limit of a small angle excitation. However, when applying large amplitude field pulses, the magnetization had a non-linear response. We speculate that one possible cause of the nonlinearity is related to self-amplification of incoherence, known as the Suhl instabilities.
ISSN:2331-8422
DOI:10.48550/arxiv.0508708