Electrical spin injection and detection in semimetallic Bi and Bi-Pb films

Title
Electrical spin injection and detection in semimetallic Bi and Bi-Pb films
Authors
이경일노종욱장준연한석희신경호정원용Mark Johnson이우영
Keywords
Bi; Bi-Pb; spin injection; bismuth alloys; Hanle effect; lead alloys; magnetoresistance; semimetallic thin films; spin dynamics; spin polarised transport
Issue Date
2009-05
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 79, NO 19, 195201-1-195201-6
Abstract
The spin injection technique is extended to semimetal bismuth samples in a lateral spin valve geometry. We study spin injection, diffusion, and detection in a material system where a small change in sample stoichiometry results in a large change in the electronic and spin dependent transport properties of the nonmagnetic material. Measurements of magnetoresistance, using a magnetic field applied in the sample plane, as well as the Hanle effect, using a field applied perpendicular to the sample plane, are reported. We demonstrate two remarkable results: i a spin diffusion length of 230 m T=2 K in a BiPb sample with temperature dependent resistivity, T , which decreases with decreasing T is the longest known value in a thin film; ii the interfacial spin polarization is 10% in BiPb samples with decreasing T and an order of magnitude smaller 0.8% in Bi samples where T increases with decreasing T.
URI
http://pubs.kist.re.kr/handle/201004/45514
ISSN
1098-0121
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE