Enhancement of the anomalous Nernst effect in Ni/Pt superlattices
Takeshi Seki, Yuya Sakuraba, Keisuke Masuda, Asuka Miura, Masahito Tsujikawa, Ken‐ichi Uchida, Tomohiro Kubota, Yoshio Miura, Masafumi Shirai, Kōki Takanashi
Abstract
We report an enhancement of the anomalous Nernst effect (ANE) in Ni/Pt (001) epitaxial superlattices. The transport and magnetothermoelectric properties were investigated for the Ni/Pt superlattices with various Ni layer thicknesses ($t$). The anomalous Nernst coefficient was increased up to more than $1\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{V}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}$ for $2.0\phantom{\rule{0.16em}{0ex}}\mathrm{nm}\ensuremath{\le}t\ensuremath{\le}4.0\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$, which was the remarkable enhancement compared to the bulk Ni. It has been found that the large transverse thermoelectric conductivity $({\ensuremath{\alpha}}_{xy})$, reaching ${\ensuremath{\alpha}}_{xy}=4.8\phantom{\rule{0.16em}{0ex}}\mathrm{A}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{m}}^{\ensuremath{-}1}$ for $t=\phantom{\rule{0.16em}{0ex}}4.0\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$, plays a prime role for the enhanced ANE of the Ni/Pt (001) superlattices.