Spin Dynamics in ZnO-Based Materials |
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Authors: | I A Buyanova A Murayama T Furuta Y Oka D P Norton S J Pearton A Osinsky J W Dong C W Tu W M Chen |
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Affiliation: | (1) IMRAM, Tohoku University, Katahira 2–1-1, Aoba-ku, Sendai 980-8577, Japan |
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Abstract: | 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. |
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