Thermoelectricity and disorder of FeCo/MgO/FeCo magnetic tunnel junctions

Shi Zhuo Wang, Ke Xia, Gerrit E.W. Bauer

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We compute the thermoelectric transport parameterized by the Seebeck coefficient and thermal/electric conductance of random-alloy FeCo/MgO/FeCo(001) magnetic tunnel junctions (MTJs) from first principles using a generalized Landauer-Büttiker formalism. The thermopower is found to be typically smaller than those of Fe/MgO/Fe(001) MTJs. The (magneto-)Seebeck effect is sensitive to the details of the FeCo/MgO interfaces. Interfacial can greatly enhance the thermoelectric effects in MTJs. We also compute angular-dependent Seebeck coefficients that provide additional information about the transport physics. We report large deviations from the Wiedemann-Franz law at room temperature.

Original languageEnglish
Article number224406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number22
DOIs
Publication statusPublished - 2014 Dec 5

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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