论文标题
各向异性磁性 - 热运输公司$ _2 $ mnga薄膜
Anisotropic magneto-thermal transport in Co$_2$MnGa thin films
论文作者
论文摘要
铁磁Co $ _2 $ MNGA最近由于与其带结构的非平地拓扑相关的效果而引起了极大的关注，但是缺少对规范的磁磁性传输效应的系统研究。着眼于高质量的薄膜，我们在这里系统地测量各向异性磁阻（AMR）及其热电对应物（AMTP）。我们通过在Stoner-Wohlfarth形式主义中通过自由能最小化对AMR数据进行建模，并得出结论，该磁铁传输现象的结晶和非晶体成分都存在于Co $ _2 $ MNGA中。与相对术语较小的AMR不同，AMTP由于温度的函数的变化而变化很大。这一事实是在莫特规则的背景下讨论的，并提出了对AMTP组件的进一步分析。
Ferromagnetic Co$_2$MnGa has recently attracted significant attention due to effects related to non-trivial topology of its band structure, however a systematic study of canonical magneto-galvanic transport effects is missing. Focusing on high quality thin films, here we systematically measure anisotropic magnetoresistance (AMR) and its thermoelectric counterpart (AMTP). We model the AMR data by free energy minimisation within the Stoner-Wohlfarth formalism and conclude that both crystalline and non-crystalline components of this magneto-transport phenomenon are present in Co$_2$MnGa. Unlike the AMR which is small in relative terms, the AMTP is large due to a change of sign of the Seebeck coefficient as a function of temperature. This fact is discussed in the context of the Mott rule and further analysis of AMTP components is presented.
