Large angle magnetization dynamics measured by time-resolved ferromagnetic resonance

Abstract

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.

23 pages, 8 figures, submitted to PRB

References in corpus (4)

• Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
• Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
• Theory of Magnetodynamics Induced by Spin Torque in Perpendicularly Magnetized Thin Films
• Spin-Transfer Excitations of Permalloy Nanopillars for Large Applied Currents

Cited by in corpus (4)

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