Abstract
Circular polarized photoluminescence induced by magnetic fields in Faraday geometry has been used for the study of spin relaxation processes in CdTe/Cd 1− x Mn x Te short-period superlattices. The spin relaxation has been found to be effective for the free carriers with kinetic energy and to be suppressed for carriers localized at fluctuations of magnetization. The effect of the inversion of sign of the magnetic hysteresis has been observed under excitation by nonpolarized light in the presence of magnetic field. The effect is due to a nonequilibrium magnetization of the Mn-ions which is induced by spin orientation of carriers on Zeeman sublevels in magnetic fields. This magnetization has a long relaxation time of about 10 3 s at temperatures of 1.6 K caused by the “frozen” magnetic moments of spin-glass clusters situated in barrier layers.
Published Version
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