2017•Extended Abstracts of the 2017 International Conference on Solid State Devices and MaterialsRequires access

Anomalous Nernst Effect of Ni-Al Alloys and Application to Spin Seebeck Devices

Tatsuyoshi Ono, Satoshi Hirata, Yoshiyuki Amemiya, Tetsuo Tabei, Shiyoshi Yokoyama

Abstract

We have investigated the electromotive force of the spin Seebeck effect and anomalous Nernst effect as a function of Ni film thickness. As Ni film becomes thinner, the electromotive force becomes larger. We also confirmed that the electromotive force of Ni/Ce:YIG samples is higher than that of Pt/Ce:YIG. On the other hand, it is reported that the anomalous Nernst effect of Fe is enhanced by Al addition. However, the effect of Al addition to Ni has not yet been reported. Therefore, we have investigated the anomalous Nernst effect of Ni–Al alloys. As a result, it was found that the appropriate annealing temperature is over 900 °C and the electromotive force is highest with the composition of Ni0.7Al0.3.

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Key concepts: Electromotive force, Nernst equation, Nernst effect, Condensed matter physics, Annealing (glass), Thermoelectric effect, Materials science, Seebeck coefficient