Precession dynamics in NiFe thin films, induced by short magnetic in-plane field pulses generated by a photoconductive switch

概要

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Short magnetic in-plane field pulses were used to pull the magnetic spin system of a NiFe film out of its equilibrium state and to initiate coherent magnetisation dynamics.This field induced dynamics was investigated by means of a time-resolved pump-probe experiment, measuring the linear Kerr effect with a balanced photodiode scheme.Precession frequencies of several GHz and relaxation-times in the nanosecond range were obesrved.Emphasis is on the generation of the short magnetic in-plane field pulses.They were generated using an ultrafast photoconductive switch based on GaAs and launched by a waveguide to the sample.The waveguide and the photoswitch were designed to yield as large as possible magnetic field strengths.The field pulses used in this work had a rise time of 10-60ps, a decay time of 500-700ps and a maximum field strength of 90e.
社団法人日本磁気学会の論文
2001-03-15