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HL: Fachverband Halbleiterphysik

HL 27: II-VI semiconductors

HL 27.8: Talk

Wednesday, March 28, 2007, 16:15–16:30, H13

Magnetization dynamics in parabolic and half-parabolic quantum wells based on (Cd,Mn)Te diluted magnetic semiconductors — •Marcel Arlt, Martin Kneip, Dimitri Yakovlev, and Manfred Bayer — Experimentelle Physik 2a, Otto-Hahn-Str.4, 44227 Dortmund

The technological concept of "digital alloying" brought about by molecular-beam epitaxy turned out to be a very effective tool for tailoring static and dynamic properties of diluted magnetic semiconductor nanostructures. We have investigated parabolic and half parabolic quantum wells (PQWs and HPQWs) by digital growth technique and show the possibility to accelerate the temporal evolution of magnetization dynamics. Spin-lattice relaxation dynamics of the Mn-spin system has been measured by time-resolved photoluminescence for the sample temperature of 2.5K and external magnetic fields up to 10T. Mn spin system has been heated by pulsed photoexcitation and evolution of emission line energy has been detected by gated CCD (1). Two-exponential decay was found in HPQW, contrary to single-exponential one in PQW. Effects of spin diffusion in the Mn spin system on the magnetization dynamics are discussed. (1) M.K. Kneip et al., Appl. Phys. Lett. 88, 152105 (2006).