Proximity-free enhancement of anomalous Nernst effects in metallic multilayers

Ken-ichi Uchida; Takashi Kikkawa; Takeshi Seki; Takafumi Oyake; Junichiro Shiomi; Koki Takanashi; Eiji Saitoh

doi:10.1103/PhysRevB.92.094414

Proximity-free enhancement of anomalous Nernst effects in metallic multilayers

Materials Science 2015-09-16 v1 Mesoscale and Nanoscale Physics

Authors: Ken-ichi Uchida , Takashi Kikkawa , Takeshi Seki , Takafumi Oyake , Junichiro Shiomi , Koki Takanashi , Eiji Saitoh

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Abstract

The anomalous Nernst effect (ANE) has been investigated in alternately-stacked multilayer films comprising paramagnetic and ferromagnetic metals. We found that the ANE is enhanced with increasing the number of the paramagnet/ferromagnet interfaces with keeping the total thickness of the films constant, and that the enhancement appears even in the absence of magnetic proximity effects; similar behavior was observed not only in Pt/Fe multilayers but also in Au/Fe and Cu/Fe multilayers free from proximity ferromagnetism. This universal enhancement of the ANE in the metallic multilayers suggests the presence of unconventional interface-induced thermoelectric conversion in the Fe films attached to the paramagnets.

Keywords

anomalous Nernst effect metallic multilayers paramagnet/ferromagnet interfaces magnetic proximity effects interface-induced thermoelectric conversion alternately-stacked films

Cite

@article{arxiv.1505.07183,
  title  = {Proximity-free enhancement of anomalous Nernst effects in metallic multilayers},
  author = {Ken-ichi Uchida and Takashi Kikkawa and Takeshi Seki and Takafumi Oyake and Junichiro Shiomi and Koki Takanashi and Eiji Saitoh},
  journal= {arXiv preprint arXiv:1505.07183},
  year   = {2015}
}

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6 pages, 3 figures

Proximity-free enhancement of anomalous Nernst effects in metallic multilayers

Abstract

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