Enhancement of anomalous Nernst effects in metallic multilayers free from proximity-induced magnetism

Ken Ichi Uchida; Takashi Kikkawa; Takeshi Seki; Takafumi Oyake; Junichiro Shiomi; Zhiyong Qiu; Koki Takanashi; Eiji Saitoh

doi:10.1103/PhysRevB.92.094414

Enhancement of anomalous Nernst effects in metallic multilayers free from proximity-induced magnetism

Ken Ichi Uchida, Takashi Kikkawa, Takeshi Seki, Takafumi Oyake, Junichiro Shiomi, Zhiyong Qiu, Koki Takanashi, Eiji Saitoh

Research output: Contribution to journal › Article › peer-review

78 Citations (Scopus)

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 by increasing the number of the paramagnet/ferromagnet interfaces and 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 metallic multilayers suggests the presence of unconventional interface-induced thermoelectric conversion in the Fe films attached to the paramagnets.

Original language	English
Article number	094414
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.92.094414
Publication status	Published - 2015 Sept 10

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.92.094414

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title = "Enhancement of anomalous Nernst effects in metallic multilayers free from proximity-induced magnetism",

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 by increasing the number of the paramagnet/ferromagnet interfaces and 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 metallic multilayers suggests the presence of unconventional interface-induced thermoelectric conversion in the Fe films attached to the paramagnets.",

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AU - Uchida, Ken Ichi

AU - Kikkawa, Takashi

AU - Seki, Takeshi

AU - Oyake, Takafumi

AU - Shiomi, Junichiro

AU - Qiu, Zhiyong

AU - Takanashi, Koki

AU - Saitoh, Eiji

PY - 2015/9/10

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N2 - 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 by increasing the number of the paramagnet/ferromagnet interfaces and 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 metallic multilayers suggests the presence of unconventional interface-induced thermoelectric conversion in the Fe films attached to the paramagnets.

AB - 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 by increasing the number of the paramagnet/ferromagnet interfaces and 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 metallic multilayers suggests the presence of unconventional interface-induced thermoelectric conversion in the Fe films attached to the paramagnets.

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Enhancement of anomalous Nernst effects in metallic multilayers free from proximity-induced magnetism

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