[8p-Z18-1~16] 9.4 Thermoelectric conversion

[8p-Z18-15] Characteristics and Evaluation of Thermoelectric Module using Anomalous Nernst Effect

〇Takahiro Tomita^1,2, Syuhei Akamatsu³, Yamgming Wang¹, Kay Yakushiji^2,4, Akio Fukushima^2,4, Satoru Nakatsuji^1,2,3,5,6 (1.ISSP., 2.CREST., 3.Univ. of Tokyo, 4.AIST., 5.TSQSI., 6.JHU.)

Keywords:Weyl semimetal, Anomalous Nernst Effect, Thermoelectric Module

The recently exotic topological magnets, we discovered such as antiferromagnetic Weyl semimetal Mn3Sn, ferromagnetic Weyl semimetal Co2MnGa, and magnetic topological nodal semimetal Fe3Ga, have been revealed to have the large anomalous Nernst effect at room temperature. These anomalous Nernst effects are larger in size than the one in the conventional ferromagnents (< 1 μV/K) and have been achieved up to the coefficient of 5 uV/K at present. The anomalous Nernst effect could generate the voltage perpendicular to the applied thermal gradient although the Seebeck voltage could be obtained parallel to applying temperature gradient. Thus, the higher voltage can easily be generated by extending the length between its terminals. Here, we developed thermal Nernst Modules and evaluated the electromotive force and power as a function of the current. In this study, we tried to make a thermoelectric modules with 20 pairs connected electrically in series and successfully generated the voltage up to 50 mV.