講演情報
[8p-N303-4]Tuning of the anomalous Nernst effect in Co-based maze-like structures
〇Takuya Tsujimoto1, Takeshi Fujita2, Toshio Miyamachi1, Masaki Mizuguchi1 (1.Nagoya Univ., 2.Kochi Univ. Tech.)
キーワード：
spintronics、spin caloritronics、the Anomalous Nernst effect
The anomalous Nernst effect (ANE) is one of the thermoelectric conversion phenomena commonly observed in ferromagnets. A characteristic of this effect is that the direction of the electric field generated by thermoelectric conversion is perpendicular to the temperature gradient. For realizing ANE devices, it is a large issue to enhance ANE. Therefore, we focused on the interface in nanostructure, and investigated how ANE is affected in Co-based nanostructures.
We prepared Co-based maze-like structures thin films with large interfaces by a vapor-phase dealloying. In maze-like Co thin films, ANE increased as perimeter increased and reached up to 1.2 μV/K. We also analyzed the scaling relation between longitudinal and transverse conductivity. In samples large interface, transverse conductivity decreases as longitudinal conductivity increases, which differs from a conventional tendency. These results suggest that ANE scattering mechanism is strongly tuned by increasing interfaces of Co.
We prepared Co-based maze-like structures thin films with large interfaces by a vapor-phase dealloying. In maze-like Co thin films, ANE increased as perimeter increased and reached up to 1.2 μV/K. We also analyzed the scaling relation between longitudinal and transverse conductivity. In samples large interface, transverse conductivity decreases as longitudinal conductivity increases, which differs from a conventional tendency. These results suggest that ANE scattering mechanism is strongly tuned by increasing interfaces of Co.