Thermal gradient driven enhancement of pure spin current at room temperature in nonlocal spin transport devices

S. R. Bakaul, S. Hu, Takashi Kimura

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We show that the junction design in the laterally configured ferromagnetic/nonmagnetic (FM/NM) hybrid structure significantly affects the spin transport under high-bias current. The thermal conductivity mismatch between FM and NM and the inhomogeneous current distribution at the interface produce a reversed temperature gradient, which drastically reduces the thermal spin injection efficiency. The homogeneity in the temperature gradient at the interface is a crucial factor in determining the efficiency of the thermal spin current generation. The experimental results show excellent agreement with the theoretical model that the spin relaxation is proportional to the second spatial derivative of the temperature.

Original languageEnglish
Article number184407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number18
DOIs
Publication statusPublished - Nov 8 2013

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Thermal gradients
gradients
Bias currents
augmentation
room temperature
Thermal conductivity
temperature gradients
Derivatives
Temperature
hybrid structures
current distribution
frequency modulation
homogeneity
thermal conductivity
injection
Hot Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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AB - We show that the junction design in the laterally configured ferromagnetic/nonmagnetic (FM/NM) hybrid structure significantly affects the spin transport under high-bias current. The thermal conductivity mismatch between FM and NM and the inhomogeneous current distribution at the interface produce a reversed temperature gradient, which drastically reduces the thermal spin injection efficiency. The homogeneity in the temperature gradient at the interface is a crucial factor in determining the efficiency of the thermal spin current generation. The experimental results show excellent agreement with the theoretical model that the spin relaxation is proportional to the second spatial derivative of the temperature.

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