Time-resolved ODMR investigations of II-VI based DMS heterostructures

Vitalii Y. Ivanov 1Marek Godlewski 1,2Dmitri R. Yakovlev 3Sergij M. Ryabchenko 4Andreas Waag 5Grzegorz Karczewski 1

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Cardinal Stefan Wyszynski University, College of Science, Warszawa, Poland
3. Experimental Physics II, University of Dortmund, Otto Han, Dortmund 44221, Germany
4. Institute of Physics National Academy of Sciences of Ukraine, prosp. Nauki, 46, Kiev 0365, Ukraine
5. TU Braunschweig, Institute of Semiconductor Technology (IHT), Hans Sommer Str. 66, Braunschweig 38106, Germany

Abstract

Determination of spin relaxation times in DMS nanostructures with 2D electron gas is one of the crucial aims of magneto-optical investigations. In this communication we demonstrate power of a new experimental method developed by us. Time-resolved ODMR is applied to determine spin-related relaxation times in a range of II-VI DMS heterostructures. We investigated ZnMnSe/ZnBeSe and CdMnTe/CdMgTe heterostructures with magnetic quantum wells and with a low density of 2D electron gas. Influence of a microwave radiation (60 GHz ) on excitonic transitions in above-mentioned heterostructures was studied. Setting conditions of magnetic resonance of Mn2+ ions we could suppress magnetization of structures studied. Also a nonresonant (by moving magnetic field out of the resonance) magnetization quenching was observed imposed by a heating of spin subsystem caused by interaction with microwave heated free electrons. These two effects could be separated in a time-resolved study. We could thus directly evaluate their importance and measure characteristic relaxation times for spin-lattice and spin-2D carriers interactions.

 

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium E, by Vitalii Y. Ivanov
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-19 13:22
Revised:   2009-06-07 00:44