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成果報告書詳細
管理番号20180000000212
タイトル*平成29年度中間年報 エネルギー・環境新技術先導プログラム 未踏チャレンジ2050 磁気―熱―電気間相互作用の体系的解明と新原理デバイスの開発
公開日2018/12/27
報告書年度2017 - 2017
委託先名国立研究開発法人産業技術総合研究所 国立研究開発法人物質・材料研究機構
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / Mitou challenge 2050 / Systematic elucidation of the magneto-thermo-electric interaction and development of novel mechanism device, FY2017 Annual Report

In the research subject (A), focusing on the normal thermomagnetic effect, the measurement system of thermoelectric properties under the magnetic field at less than the room temperature was developed. A Bi-Sb alloy which shows the significant thermo-magneto effect was used to establish the measurement system. The thermo-magneto effect such as the magneto-Seebeck effect and the Nernst effect, the galvanomagnetic effect such as the magnetoresistance effect and the Hall effect, and the thermal conductivity up to the magnet field of 6.8 T was measured at the temperature from 10 to 300 K by precisely controlled by the GM cryocooler and the heater. The measurement program was developed by using LabVIEW. The magneto-Seebeck effect, the Nernst effect and the thermal conductivity in the magnetic field were measured simultaneously by the steady-state method, and the magnetoresistance effect and the Hall effect were measured simultaneously by the alternative current (AC) method. The dimensionless figure of merit originates from the Seebeck effect ZT_Seebeck and the Nernst effect ZT_Nernst were determined from the these measured magnetic field dependence of thermoelectric properties. As a result, we successfully established the measurement system of thermoelectric properties, such as the magneto-Seebeck effect, the Nernst effect, the magnetoresistance effect, the Hall effect and the thermal conductivity under the magnetic field at less than the room temperature using one sample set-up and evaluated ZT_Seebeck and ZT_Nernst.
In the research subject (B), focusing on the anomalous thermomagnetic effect, the thin-film of the Fe-Al alloy was fabricated and its structure, magnetism, transport properties, thermoelectric properties was evaluated. The Fe-Al thin-film was simultaneously deposited on the MgO single crystalline substrate, the Se substrate with the thermal oxide film, and the Kapton sheet by the simultaneous deposition using the Fe and Al target by the ultra-high vacuum sputtering apparatus. In this fiscal year, we mainly evaluated the thermoelectrical properties of the single crystalline Fe-Al thin film on the MgO substrate, which is easy to discuss basic physical properties. Thermoelectric power due to the anomalous Nernst effect was near 20 times larger than that of pure Fe. Systematic evaluation of the anomalous Hall effect and the Seebeck effect showed that this large anomalous Nernst effect is due to the enhancement of both the anomalous Hall effect and Seebeck effect. In the film prepared on the Kapton sheet, a sensitivity constant was almost equal to that on the MgO substrate. This result suggests that the polycrystalline thin film grown on the flexible substrate shows the same characteristics as the single crystal film, which is an important result in application.
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