Spin dynamics in ZnO-based materials
2010 (English)In: Journal of Superconductivity and Novel Magnetism, ISSN 1557-1939, Vol. 23, no 1, 161-165 p.Article in journal (Refereed) Published
In this work, we address the issue of spin relaxation and its relevance to spin detection in ZnO-based materials, by spin-polarized, time-resolved magneto-optical spectroscopy. We have found that spin relaxation is very fast, i.e. about 100 ps for donor bound excitons in wurtzite ZnO, despite of a weak spin–orbit interaction. We also reveal that alloying of ZnO with Cd enhances spin relaxation, prohibiting ZnCdO/ZnO structures for efficient optical spin detection. On the other hand, a variation in strain field induced by lattice mismatch with substrates does not seem to lead to a noticeable change in spin relaxation. The observed fast spin relaxation, together with the limitation imposed by the band structure, are thus identified as the two most important factors that limit the efficiency of optical spin detection in the studied ZnO-based materials.
Place, publisher, year, edition, pages
New York, USA: Springer-Verlag New York, 2010. Vol. 23, no 1, 161-165 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-21930DOI: 10.1007/s10948-009-0551-0ISI: 000272905100040OAI: oai:DiVA.org:liu-21930DiVA: diva2:242067
5th International Conference on Physics and Applications of Spin-Related Phenomena in Semiconductors, Foz do Iguacu, BRAZIL, Aug. 03-06, 20082009-10-062009-10-062013-10-02