AI 中文总结
研究Fe-Mn-Sn系统近2:1:1比例薄膜随退火温度（400 - 700°C）的变化，通过预校准共溅射并退火，分析结构与性能关系，揭示生长相纯三元合金困难及Fe₂MnSn在特定温度范围性能最佳和存在生长问题。
AI 中文摘要
近年来的研究聚焦于高质量三元合金的薄膜合成，因其性能可调及在自旋电子学中的潜力。此前研究确定了稳定具有高居里温度和磁各向异性的Kagome磁体Fe₂MnSn的条件。但合成和稳定三元相具有挑战性。本研究将Fe-Mn-Sn系统中近2:1:1比例的薄膜作为退火温度的函数进行研究，温度范围为400至700°C。预校准元素靶使其接近2:1:1比例并在室温下共溅射，随后退火。结果表明，在400 - 550°C之间稳定存在两种二元六角结构及元素Fe相，580°C时Fe₂MnSn是唯一稳定相，600°C开始出现元素Mn相，750°C时占主导。电学、磁学和磁光性能与结构相关，在Fe₂MnSn为主导相的温度范围内性能最佳。研究强调了生长相纯的三元合金如Fe₂MnSn的困难，且观察到Fe₂MnSn在100 nm以下有明显无序生长。
英文摘要
Research in recent years has focused on the thin-film synthesis of high-quality ternary alloys, identified for their tunable properties and potential in spintronics (e.g., Heusler alloys, Kagome magnets). In a previous study, we identified the conditions for stabilizing Fe$_2$MnSn, a Kagome magnet with a high Curie temperature and magnetic anisotropy. However, ternary phases such as Fe$_2$MnSn are challenging to synthesize and stabilize within a narrow temperature window, as binary and elemental phases can also form during the growth process. To highlight these observations, we investigated the thin film phases in the Fe-Mn-Sn system near the 2:1:1 ratio as a function of annealing temperature, ranging from 400 to 700\degree C. The elemental Fe, Mn, and Sn targets were pre-calibrated to a close to 2:1:1 ratio and co-sputtered at room temperature, followed by annealing. Two binary hexagonal structures, Fe$_3$Sn$_2$ and Fe$_5$Sn$_3$, along with the elemental Fe phase, are stabilized between 400-550\degree C, but disappear at 580\degree C, where Fe$_2$MnSn is the only stable phase. Elemental Mn phase starts to appear starting from 600\degree C, and becomes dominant by 750\degree C. Electrical, magnetic and magneto-optical properties are observed to correlate with the structural findings and the best properties are observed in the temperature range where Fe$_2$MnSn is the dominant phase. In general, our study highlights the difficulty in growing phase-pure ternary alloys such as Fe$_2$MnSn, which is very strongly based on precise temperature conditions. We also observed significant disordered growth below 100 nm for Fe$_2$MnSn, implying poor thickness scaling behavior.
Comments7 pages, 4 figures
