在非同位素Fe4- x Gex N薄膜中具有两个组件的异常霍尔和纳斯特效应
Robin K Paul1, Jakub Vít2, Petr Levinský2
1Functional Materials, Institute of Materials Science, Technical University of Darmstadt, Peter-Grünberg-Str. 16, Darmstadt 64287, Germany.
ACS omega
|February 16, 2026
概括
这项研究研究了铁化 (Fe$_{4-x}$Ge$_{x}$N) 薄膜对增强异常Nernst效应 (ANE) 的研究. 德兴奋剂显著降低了基里温度,但显示了对ANE增强的潜力,激励了进一步的研究.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固态化学 固态化学
背景情况:
- 异常的Nernst效应 (ANE) 是一种热电现象,在废热回收中具有潜在的应用.
- 密度函数理论 (DFT) 的计算预测了某些铁化物组成中的增强ANE.
- 了解兴奋剂对铁化物结构和磁性特性的影响,对于优化热电性能至关重要.
研究的目的:
- 为了合成和表征Fe$_{4-x}$Ge$_{x}$N薄膜.
- 调查替代对结构性,磁性和热电性质的影响,特别是ANE.
- 为了将实验结果与DFT预测与ANE增强相关联.
主要方法:
- 用于薄膜制造的磁力喷射.
- 对Nernst和Hall效应,电阻和磁性质的系统分析.
- 电子显微镜,Mössbauer光谱和DFT计算用于结构和电子属性分析.
主要成果:
- Fe$_{4-x}$Ge$_{x}$N 电影显示了从立方对称到四边形对称的转变,并增加了 Ge 含量.
- 铁磁库里温度随着Ge兴奋剂的使用显著下降,从750K降至100K.
- 由于晶体学定位和磁性异构性,四角形电影显示了复杂的霍尔和纳恩斯特效应.
结论:
- 在Fe$_{4}$N中的兴奋剂导致结构扭曲和里温度的快速下降.
- 在Hall和Nernst效应中观察到的双组分行为归因于多种因素,包括晶体学定向和磁性异构性.
- 尽管基里温度较低,但Fe$_{3}$GeN显示出有前途的ANE行为,这表明在杂的Fe$_{4}$N系统中可能有ANE增强的潜力.
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