Photoinduced inversion of magnetic hysteresis in semimagnetic superlattices

Circular polarized photoluminescence induced by magnetic fields in the Faraday geometry has been studied in CdTe Cd 1−x Mn x Te superlattices. An inversion of the sign of the magnetic hysteresis has been observed under excitation by nonpolarized light in the presence of magnetic fields. This effect...

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Bibliographic Details
Published in:Solid state communications 1995-12, Vol.96 (12), p.935-941
Main Authors: Kochereshko, V.P., Merkulov, I.A., Pozina, G.R., Uraltsev, I.N., Yakovlev, D.R., Ossau, W., Waag, A., Landwehr, G.
Format: Article
Language:English
Subjects:
A. quantum wells
A. semiconductors
D. spin dynamics
E. luminescence
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Summary:Circular polarized photoluminescence induced by magnetic fields in the Faraday geometry has been studied in CdTe Cd 1−x Mn x Te superlattices. An inversion of the sign of the magnetic hysteresis has been observed under excitation by nonpolarized light in the presence of magnetic fields. This effect is due to a nonequilibrium magnetization of Mn-ions induced by the spin orientation of photocarriers on Zeeman sublevels and is explained in terms of the dynamic polarization via a specific Overhauser process. This nonequilibrium magnetization has a long relaxation time of about 10 3 s at temperatures of 1.6 K caused by the slow thermo-activated spin relaxation of antiferromagnetic clusters of Mn-ions located in the barrier layers.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(95)00565-X