Signature of spin-dependent Seebeck effect in dynamical spin injection of metallic bilayer structures

Kazuto Yamanoi, Minoru Yafuso, Keishi Miyazaki, Takashi Kimura

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1 Citation (Scopus)

Abstract

The dynamical spin injection in a ferromagnetic/paramagnetic bilayer with various paramagnetic layers has been examined by using the inverse spin Hall effect. We adapt a CoFeB film as a ferromagnetic layer, which has a large spin dependent Seebeck coefficient. The contribution of the spin pumping was evaluated from the line-width change of the ferromagnetic resonant spectra while that of the thermal spin injection was evaluated from the heat conductivity for the paramagnetic layer. We find that the spin Hall voltage does not show the systematic change with respect to the line-width change. However, the normalized spin Hall voltage is found to increase with the heat conductivity for the paramagnetic layer. These results suggest that the thermal spin injection is a major contribution for the dynamical spin injection in CoFeB/paramagnetic bilayer systems.

Original languageEnglish
Article number014005
JournalJPhys Materials
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

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