Time-resolved ODMR investigations of II-VI based DMS heterostructures
|Vitalii Y. Ivanov 1, Marek Godlewski 1,2, Dmitri R. Yakovlev 3, Sergij M. Ryabchenko 4, Andreas Waag 5, Grzegorz Karczewski 1|
1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
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.
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