Effect of spin relaxation rate on the interfacial spin depolarization in ferromagnet/oxide/semiconductor contacts

Title
Effect of spin relaxation rate on the interfacial spin depolarization in ferromagnet/oxide/semiconductor contacts
Authors
전건록민병철박윤호조영훈박승영박창엽신성철
Issue Date
2012-07
Publisher
Applied physics letters
Citation
VOL 101, NO 2, 022401-1-022401-5
Abstract
Combined measurements of normal and inverted Hanle effects in CoFe/MgO/semiconductor (SC) contacts reveal the effect of spin relaxation rate on the interfacial spin depolarization (ISD) from local magnetic fields. Despite the similar ferromagnetic electrode and interfacial roughness in both CoFe/MgO/Si and CoFe/MgO/Ge contacts, we have observed clearly different features of the ISD depending on the host SC. The precession and relaxation of spins in different SCs exposed to the local fields from more or less the same ferromagnets give rise to a notably different ratio of the inverted Hanle signal to the normal one. A model calculation of the ISD, considering the spin precession due to the local field and the spin relaxation in the host SC, explains the temperature and bias dependence of the ISD consistently.
URI
http://pubs.kist.re.kr/handle/201004/42800
ISSN
00036951
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