Magneto-optical design of anomalous Nernst thermopile

Abstract The introduction of spin caloritronics into thermoelectric conversion has paved a new path for versatile energy harvesting and heat sensing technologies. In particular, thermoelectric generation based on the anomalous Nernst effect (ANE) is an appealing approach as it shows considerable pot...

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Autores principales:	Jian Wang, Asuka Miura, Rajkumar Modak, Yukiko K. Takahashi, Ken-ichi Uchida
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d78d0e384a4b4989946973425a2f77fa
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spelling	oai:doaj.org-article:d78d0e384a4b4989946973425a2f77fa2021-12-02T14:47:38ZMagneto-optical design of anomalous Nernst thermopile10.1038/s41598-021-90865-52045-2322https://doaj.org/article/d78d0e384a4b4989946973425a2f77fa2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90865-5https://doaj.org/toc/2045-2322Abstract The introduction of spin caloritronics into thermoelectric conversion has paved a new path for versatile energy harvesting and heat sensing technologies. In particular, thermoelectric generation based on the anomalous Nernst effect (ANE) is an appealing approach as it shows considerable potential to realize efficient, large-area, and flexible use of heat energy. To make ANE applications viable, not only the improvement of thermoelectric performance but also the simplification of device structures is essential. Here, we demonstrate the construction of an anomalous Nernst thermopile with a substantially enhanced thermoelectric output and simple structure comprising a single ferromagnetic material. These improvements are achieved by combining the ANE with the magneto-optical recording technique called all-optical helicity-dependent switching of magnetization. Our thermopile consists only of Co/Pt multilayer wires arranged in a zigzag configuration, which simplifies microfabrication processes. When the out-of-plane magnetization of the neighboring wires is reversed alternately by local illumination with circularly polarized light, the ANE-induced voltage in the thermopile shows an order of magnitude enhancement, confirming the concept of a magneto-optically designed anomalous Nernst thermopile. The sign of the enhanced ANE-induced voltage can be controlled reversibly by changing the light polarization. The engineering concept demonstrated here promotes effective utilization of the characteristics of the ANE and will contribute to realizing its thermoelectric applications.Jian WangAsuka MiuraRajkumar ModakYukiko K. TakahashiKen-ichi UchidaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jian Wang Asuka Miura Rajkumar Modak Yukiko K. Takahashi Ken-ichi Uchida Magneto-optical design of anomalous Nernst thermopile
description	Abstract The introduction of spin caloritronics into thermoelectric conversion has paved a new path for versatile energy harvesting and heat sensing technologies. In particular, thermoelectric generation based on the anomalous Nernst effect (ANE) is an appealing approach as it shows considerable potential to realize efficient, large-area, and flexible use of heat energy. To make ANE applications viable, not only the improvement of thermoelectric performance but also the simplification of device structures is essential. Here, we demonstrate the construction of an anomalous Nernst thermopile with a substantially enhanced thermoelectric output and simple structure comprising a single ferromagnetic material. These improvements are achieved by combining the ANE with the magneto-optical recording technique called all-optical helicity-dependent switching of magnetization. Our thermopile consists only of Co/Pt multilayer wires arranged in a zigzag configuration, which simplifies microfabrication processes. When the out-of-plane magnetization of the neighboring wires is reversed alternately by local illumination with circularly polarized light, the ANE-induced voltage in the thermopile shows an order of magnitude enhancement, confirming the concept of a magneto-optically designed anomalous Nernst thermopile. The sign of the enhanced ANE-induced voltage can be controlled reversibly by changing the light polarization. The engineering concept demonstrated here promotes effective utilization of the characteristics of the ANE and will contribute to realizing its thermoelectric applications.
format	article
author	Jian Wang Asuka Miura Rajkumar Modak Yukiko K. Takahashi Ken-ichi Uchida
author_facet	Jian Wang Asuka Miura Rajkumar Modak Yukiko K. Takahashi Ken-ichi Uchida
author_sort	Jian Wang
title	Magneto-optical design of anomalous Nernst thermopile
title_short	Magneto-optical design of anomalous Nernst thermopile
title_full	Magneto-optical design of anomalous Nernst thermopile
title_fullStr	Magneto-optical design of anomalous Nernst thermopile
title_full_unstemmed	Magneto-optical design of anomalous Nernst thermopile
title_sort	magneto-optical design of anomalous nernst thermopile
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d78d0e384a4b4989946973425a2f77fa
work_keys_str_mv	AT jianwang magnetoopticaldesignofanomalousnernstthermopile AT asukamiura magnetoopticaldesignofanomalousnernstthermopile AT rajkumarmodak magnetoopticaldesignofanomalousnernstthermopile AT yukikoktakahashi magnetoopticaldesignofanomalousnernstthermopile AT kenichiuchida magnetoopticaldesignofanomalousnernstthermopile
_version_	1718389536652787712

Magneto-optical design of anomalous Nernst thermopile

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