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

Authors
Lee, Kyoung-IlRoh, Jong WookChang, JoonyeonHan, Suk-HeeShin, Kyung-HoJeung, Won YongJohnson, MarkLee, Wooyoung
Issue Date
2009-05
Publisher
AMER PHYSICAL SOC
Citation
Physical Review B, v.79, no.19
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 mu m (T=2 K) in a BiPb sample with temperature dependent resistivity, rho(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 rho(T) and an order of magnitude smaller (0.8%) in Bi samples where rho(T) increases with decreasing T.
Keywords
LARGE MAGNETORESISTANCE; ELECTRONIC MEASUREMENT; TRANSPORT-PROPERTIES; BISMUTH; ORBIT; LARGE MAGNETORESISTANCE; ELECTRONIC MEASUREMENT; TRANSPORT-PROPERTIES; BISMUTH; ORBIT; bismuth; bismuth alloys; Hanle effect; lead alloys; magnetoresistance; semimetallic thin films; spin dynamics; spin polarised transport
ISSN
2469-9950
URI
https://pubs.kist.re.kr/handle/201004/132512
DOI
10.1103/PhysRevB.79.195201
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KIST Article > 2009
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