[21a-C501-1~6] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)English Presentation

[21a-C501-6] Direct Electrical Probing of Anomalous Nernst Conductivity

〇Weinan Zhou¹, Asuka Miura¹, Yuya Sakuraba¹, Ken-ichi Uchida^1,2 (1.NIMS, 2.IMR, Tohoku Univ.)

Keywords:

Anomalous Nernct effect,Spin Caloritronics,Thermoelectric effects

We propose a method to directly measure the intrinsic term of anomalous Nernst coefficient (S_ANE) of a magnetic material and probe its anomalous Nernst conductivity (ANC) with ease. This method is realized by creating a closed circuit consisting of the target magnetic material and a nonmagnetic conductor. From the expression of total transverse thermopower of a closed circuit, we find that the extrinsic term of S_ANE of the magnetic material can be cancelled out due to the connection to the nonmagnetic conductor under proper conditions, leaving only the intrinsic term dominating S_ANE. Then ANC can be easily obtained using the total transverse thermopower and resistivity. The proposed method is experimentally demonstrated to probe the temperature dependence of ANC of a Co₂MnGa thin film. The closed circuit is easily realized by connecting both ends of the Co₂MnGa film with a Au bonding wire, which is the nonmagnetic conductor. A good approximation is obtained, validating this method.