Publication Date:
2001-10-06
Description:
We examine how a ferromagnetic layer affects the coherent electron spin dynamics in a neighboring gallium arsenide semiconductor. Ultrafast optical pump-probe measurements reveal that the spin dynamics are unexpectedly dominated by hyperpolarized nuclear spins that align along the ferromagnet's magnetization. We find evidence that photoexcited carriers acquire spin-polarization from the ferromagnet, and dynamically polarize these nuclear spins. The resulting hyperfine fields are as high as 9000 gauss in small external fields (less than 1000 gauss), enabling ferromagnetic control of local electron spin coherence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kawakami, R K -- Kato, Y -- Hanson, M -- Malajovich, I -- Stephens, J M -- Johnston-Halperin, E -- Salis, G -- Gossard, A C -- Awschalom, D D -- New York, N.Y. -- Science. 2001 Oct 5;294(5540):131-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and, Materials Department, University of California, Santa Barbara, CA 93106, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11588255" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
