Journal article
Spin injection and detection up to room temperature in Heusler~alloy/$n$-GaAs spin valves
Physical review. B, Vol.94(23), p.235309
10/12/2016
DOI: 10.1103/PhysRevB.94.235309
Abstract
We have measured the spin injection efficiency and spin lifetime in
Co$_2$FeSi/$n$-GaAs lateral nonlocal spin valves from 20 to 300 K. We observe
large ($\sim$40 $\mu$V) spin valve signals at room temperature and injector
currents of $10^3~$A/cm$^2$, facilitated by fabricating spin valve separations
smaller than the 1 $\mu$m spin diffusion length and applying a forward bias to
the detector contact. The spin transport parameters are measured by comparing
the injector-detector contact separation dependence of the spin valve signal
with a numerical model accounting for spin drift and diffusion. The apparent
suppression of the spin injection efficiency at the lowest temperatures
reflects a breakdown of the ordinary drift-diffusion model in the regime of
large spin accumulation. A theoretical calculation of the D'yakonov-Perel spin
lifetime agrees well with the measured $n$-GaAs spin lifetime over the entire
temperature range.
Details
- Title: Subtitle
- Spin injection and detection up to room temperature in Heusler~alloy/$n$-GaAs spin valves
- Creators
- T. A Peterson - University of MinnesotaS. J Patel - University of California, Santa BarbaraC. C Geppert - University of MinnesotaK. D Christie - University of MinnesotaA Rath - University of Wisconsin–MadisonD Pennachio - University of California, Santa BarbaraM. E Flatté - University of IowaP. M Voyles - University of Wisconsin–MadisonC. J PalmstrømP. A Crowell - University of Minnesota
- Resource Type
- Journal article
- Publication Details
- Physical review. B, Vol.94(23), p.235309
- DOI
- 10.1103/PhysRevB.94.235309
- ISSN
- 2469-9950
- eISSN
- 2469-9969
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation, award: DMR-1104951, DMR 08-19885, DMR 14-20013; DOI: 10.13039/100007245, name: Microelectronics Advanced Research Corporation; DOI: 10.13039/100000185, name: Defense Advanced Research Projects Agency
- Language
- English
- Date published
- 10/12/2016
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984199857502771
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