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Title: Local magnetoresistance through Si and its bias voltage dependence in ferromagnet/MgO/silicon-on-insulator lateral spin valves

Local magnetoresistance (MR) through silicon (Si) and its bias voltage (V{sub bias}) (bias current (I{sub bias})) dependence in ferromagnet (FM)/MgO/silicon-on-insulator lateral spin valves are investigated. From the experimental measurements, we find that the local-MR through Si increases with increasing V{sub bias}. This anomalous increase of local-MR as a function of V{sub bias} can be understood by considering the standard drift-diffusion theory improved by taking into account the difference in the interface resistances and first order quantum effect between FM/MgO/Si (source) and Si/MgO/FM (drain) interfaces. The interface resistance dependence on experimentally obtained local-MR ratios also agrees with the improved standard spin diffusion theory. These results indicate that experimentally observed local-MR is certainly related to the spin signal through the Si bulk band.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Kawasaki 212-8582 (Japan)
  2. Department of Electronics, Kyushu University, 744 Motooka, Fukuoka 819-0395 (Japan)
  3. Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579 (Japan)
Publication Date:
OSTI Identifier:
22273786
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIFFUSION; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; FERROMAGNETIC MATERIALS; HETEROJUNCTIONS; INTERFACES; MAGNESIUM OXIDES; MAGNETORESISTANCE; SILICON; SPIN; VALVES