Large angle magnetization dynamics measured by time-resolved ferromagnetic resonance

Details Large angle magnetization dynamics measured by time-resolved ferromagnetic resonance Large angle magnetization dynamics measured by time-resolved ferromagnetic resonance

2005-08-30

arxiv.org/abs/cond-mat/0508708v1

Physics

Condensed Matter

Materials Science

23 pages, 8 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.73.094454

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.

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