Light-induced magnetization precession in GaMnAs

We report the dynamics of the transient polar Kerr rotation (KR) and of the transient reflectivity induced by femtosecond laser pulses in ferromagnetic (Ga,Mn)As with no external magnetic field applied. It is shown that the measured KR signal consists of several different contributions, among which...

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Bibliographic Details
Published in:	Applied physics letters Vol. 92; no. 12; pp. 122507 - 122507-3
Main Authors:	Rozkotová, E., Němec, P., Horodyská, P., Sprinzl, D., Trojánek, F., Malý, P., Novák, V., Olejník, K., Cukr, M., Jungwirth, T.
Format:	Journal Article
Language:	English
Published:	American Institute of Physics 24-03-2008
Online Access:	Get full text
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Summary:	We report the dynamics of the transient polar Kerr rotation (KR) and of the transient reflectivity induced by femtosecond laser pulses in ferromagnetic (Ga,Mn)As with no external magnetic field applied. It is shown that the measured KR signal consists of several different contributions, among which only the oscillatory signal is directly connected with the ferromagnetic order in (Ga,Mn)As. The origin of the light-induced magnetization precession is discussed and the magnetization precession damping (Gilbert damping) is found to be strongly influenced by annealing of the sample.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.2903703