对于巨大的输出功率的异常Nernst热电发生器的设计
Mengzhao Chen1, Sheng Qian1, Ziheng Gao1
1State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China.
Innovation (Cambridge (Mass.))
|September 22, 2025
概括
研究人员使用电子合的Co2MnGa增强了拓磁体中的异常Nernst效应,为Nernst设备实现了创纪录的功率输出. 这一突破推动了拓磁体在横向热电转换中的应用.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 热电学是一种热电学.
背景情况:
- 拓磁铁在通过异常的纳恩斯特效应进行横向热电 (TE) 转换时提供了独特的优势.
- 开发高性能拓磁铁基Nernst设备需要优化磁铁材料和设备接口.
研究的目的:
- 为了增强拓磁体中的异常Nernst效应,以改善横向TE转换.
- 通过优化材料特性和接口设计,在Nernst设备中实现超高功率输出.
主要方法:
- 在拓磁铁中协同调整密度加权的贝里曲率和费米表面.
- 开发了电子合的Co2MnGa作为一种高性能拓磁体.
- 设计反应湿接口层以实现超低的接口电阻.
- 制造和测试具有不同结构参数的Nernst设备.
主要成果:
- 在电子合的Co2MnGa中,在室温下达到47.8μW m-1 K-2的巨大异常Nernst功率系数.
- 在16.1K的温度差异下实现了69.7μW的超高功率输出,这是迄今为止报告的最高值.
- 通过实验验证证明了横向TE技术的结构优势.
结论:
- 在拓磁体中异常的Nernst效应可以通过协同调整贝里曲率和费米表面来显著增强.
- 超低的界面电阻对于最大化Nernst设备的功率输出至关重要.
- 这项工作为设计用于横向TE应用的高性能拓磁铁基Nernst发电机建立了新的范式.
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