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Title:
THERMOELECTRIC CONVERSION ELEMENT AND THERMOELECTRIC CONVERSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/009308
Kind Code:
A1
Abstract:
A thermoelectric conversion element (1) is made of a ferromagnetic material of a band structure having a Weyl point in the vicinity of Fermi energy EF, and includes a thermoelectric mechanism which generates an electromotive force due to the anomalous Nernst effect. A state density of the ferromagnetic material exhibits an energy dependency such that an extreme value is located in the vicinity of Fermi energy EF. A thermoelectric coefficient -αyx determining the electromotive force has a temperature (T) dependency of being proportional to -TlogT. When a heat current Q (approximately ∇T) flows in a +x-direction with respect to the thermoelectric conversion element (1), a temperature difference is caused in the +x-direction. As a result, in the thermoelectric conversion element (1), a voltage V (approximately M × ∇T) due to the anomalous Nernst effect is generated in a y-direction orthogonal to both the direction of heat current Q (+x-direction) and the direction of magnetization M (+z-direction).

Inventors:
NAKATSUJI Satoru (3-1 Hongo 7-chome, Bunkyo-k, Tokyo 54, 〒1138654, JP)
SAKAI Akito (3-1 Hongo 7-chome, Bunkyo-k, Tokyo 54, 〒1138654, JP)
Application Number:
JP2018/025276
Publication Date:
January 10, 2019
Filing Date:
July 03, 2018
Export Citation:
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Assignee:
THE UNIVERSITY OF TOKYO (3-1 Hongo 7-chome, Bunkyo-ku Tokyo, 54, 〒1138654, JP)
International Classes:
H01L37/04; H01L29/82; H02N11/00
Foreign References:
JP2017084854A2017-05-18
Other References:
SAKURABA, YUYA: "Potential of thermoelectric power generation using anomalous Nernst effect in magnetic materials", SCRIPTA MATERIALIA, vol. 111, 3 June 2015 (2015-06-03), pages 29 - 32, XP055556173
FERREIROS, YAGO ET AL.: "Anomalous Nernst and thermal Hall effects in tilted Weyl semimetals", PHYSICAL REVIEW B, vol. 96, 8 September 2017 (2017-09-08), pages 11502 - 1, 115202-7, XP055565391
Attorney, Agent or Firm:
DORAIT IP LAW FIRM (411 La Tour Shinjuku, 15-1 Nishishinjuku 6-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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