Picosecond dynamics of the photoinduced spin polarization in epitaxial (Ga,Mn)as films

Static and time-resolved magneto-optical spectra of the ferromagnetic semiconductor (Ga,Mn)As show that a pulsed photoexcitation with a fluence of 10 microJ/cm(2) is equivalent to the application of an external magnetic field of about 1 mT, which relaxes with a decay time of 30 ps. This relaxation i...

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Veröffentlicht in:	Physical review letters 2004-06, Vol.92 (23), p.237203-237203, Article 237203
Hauptverfasser:	Kimel, A V, Astakhov, G V, Schott, G M, Kirilyuk, A, Yakovlev, D R, Karczewski, G, Ossau, W, Schmidt, G, Molenkamp, L W, Rasing, Th
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	Static and time-resolved magneto-optical spectra of the ferromagnetic semiconductor (Ga,Mn)As show that a pulsed photoexcitation with a fluence of 10 microJ/cm(2) is equivalent to the application of an external magnetic field of about 1 mT, which relaxes with a decay time of 30 ps. This relaxation is attributed to the spin relaxation of electrons in the conduction band and is found to be not affected by interactions with Mn ions.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.92.237203