Magnetization dynamics in NiFe thin films induced by short in-plane magnetic field pulses

The magnetization dynamics in a thin NiFe film was investigated by applying short in-plane magnetic field pulses while probing the response using a time-resolved magneto-optical Kerr effect setup. In-plane magnetic field pulses, with duration shorter than the relaxation of the system, were generated...

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Veröffentlicht in:Journal of applied physics 2001-06, Vol.89 (11), p.7648-7650
Hauptverfasser: Gerrits, Th, Hohlfeld, J., Gielkens, O., Veenstra, K. J., Bal, K., Rasing, Th, van den Berg, H. A. M.
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Sprache:eng
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Zusammenfassung:The magnetization dynamics in a thin NiFe film was investigated by applying short in-plane magnetic field pulses while probing the response using a time-resolved magneto-optical Kerr effect setup. In-plane magnetic field pulses, with duration shorter than the relaxation of the system, were generated using a photoconductive switch and by subsequent propagation of current pulses along a waveguide. The field pulses with typical rise and decay times of 10–60 and 500–700 ps, respectively, have a maximum field strength of 9 Oe, by which Permalloy elements of 16 nm thickness and lateral dimensions of 10×20 μm were excited. The observed coherent precession of a ferromagnetic NiFe system had precession frequencies of several GHz and relaxation times on a nanosecond time scale. The dynamic properties observed agree well the Gilberts’s precession equation and the static magnetic properties of the elements
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1359462