Magnons versus electrons in thermal spin transport through metallic interfaces

M. Beens, J.P. Heremans, Yaroslav Tserkovnyak, R.A. Duine

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Abstract

We develop a theory for spin transport in magnetic metals that treats the contribution of magnons and electrons on equal footing. As an application, we consider thermally-driven spin injection across an interface between a magnetic metal and a normal metal, i.e. the spin-dependent Seebeck effect. We show that the ratio between magnonic and electronic contribution scales as √ T/T/c F/Tc, with the Fermi temperature TF and the Curie temperature TC. Since, typically, TC≪ TF, the magnonic contribution may dominate the thermal spin injection, even though the interface is more transparent for electronic spin current.

Original languageEnglish
Article number394002
Number of pages7
JournalJournal of Physics D: Applied Physics
Volume51
Issue number39
DOIs
Publication statusPublished - 3 Oct 2018

Keywords

  • ferromagnetic metal
  • spin Seebeck effect
  • spin-dependent Seebeck effect
  • spintronics

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