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

Kyoung Il Lee, Jong Wook Roh, Joonyeon Chang, Suk Hee Han, Kyung Ho Shin, Won Yong Jeung, Mark Johnson, Wooyoung Lee

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 μm (T=2 K) in a BiPb sample with temperature dependent resistivity, ρ (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 ρ (T) and an order of magnitude smaller (0.8%) in Bi samples where ρ (T) increases with decreasing T.

Original languageEnglish
Article number195201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number19
DOIs
Publication statusPublished - 2009 May 1

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injection
Metalloids
Bismuth
Spin polarization
Magnetoresistance
Stoichiometry
Transport properties
Magnetic fields
Thin films
Geometry
metalloids
Temperature
diffusion length
bismuth
stoichiometry
transport properties
electrical resistivity
polarization
thin films
geometry

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Lee, Kyoung Il ; Roh, Jong Wook ; Chang, Joonyeon ; Han, Suk Hee ; Shin, Kyung Ho ; Jeung, Won Yong ; Johnson, Mark ; Lee, Wooyoung. / Electrical spin injection and detection in semimetallic Bi and Bi-Pb films. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 79, No. 19.
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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 μm (T=2 K) in a BiPb sample with temperature dependent resistivity, ρ (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 ρ (T) and an order of magnitude smaller (0.8{\%}) in Bi samples where ρ (T) increases with decreasing T.",
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Electrical spin injection and detection in semimetallic Bi and Bi-Pb films. / Lee, Kyoung Il; Roh, Jong Wook; Chang, Joonyeon; Han, Suk Hee; Shin, Kyung Ho; Jeung, Won Yong; Johnson, Mark; Lee, Wooyoung.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 19, 195201, 01.05.2009.

Research output: Contribution to journalArticle

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AU - Lee, Kyoung Il

AU - Roh, Jong Wook

AU - Chang, Joonyeon

AU - Han, Suk Hee

AU - Shin, Kyung Ho

AU - Jeung, Won Yong

AU - Johnson, Mark

AU - Lee, Wooyoung

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