[15p-D704-1~8] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

▲ [15p-D704-3] Transverse magneto-thermoelectric conversion in sintered Co₂MnGa slab

Kenta Takamori¹, 〇Koichi Oyanagi^1,2, Takumi Imamura¹, Ren Nagasawa^2,3, Krishnan Mahalingam², Takamasa Hirai², Satoru Kobayashi¹, Ken-ichi Uchida^2,3,4 (1.Iwate Univ., 2.NIMS, 3.Univ. of Tsukuba, 4.IMR, Tohoku Univ.)

Keywords:Anomalous Nernst effect, Heusler alloy, Weyl semimetal

The anomalous Nernst effect (ANE) refers to the conversion of a heat current into a transverse charge current in magnetic materials with spontaneous magnetization. The ferromagnetic Weyl semimetal Heusler alloy Co₂MnGa (CMG) is known to exhibit the largest anomalous Nernst coefficient above room temperature. Here, we systematically studied the anomalous Nernst coefficient and its transverse thermoelectric figure of merit ZT in sintered polycrystalline Co₂MnGa (CMG) slabs synthesized with various sintering conditions. We found that the ANE coefficient depends on the sintering time, temperature, and pressure and optimized the parameters to further improve ANE in CMG.