AI 中文总结
本研究通过相工程制备了层状多晶型GdAlGe外延薄膜，在超薄厚度下稳定并呈现各向异性铁磁态，为设计层状磁体提供了蓝图。
AI 中文摘要
层状磁体研究的最新进展已将其确立为自旋电子学应用中不可或缺的材料，以及二维磁体的前驱体。问题在于，可用于实验的此类材料数量仍然很少。为解决这一问题，可采用相工程；特别是，相稳定性与维度之间的相互作用为设计层状磁体提供了巨大机遇。在此，利用这种相互关系制备了被忽视的层状多晶型GdAlGe的外延薄膜。该化合物由交替的三角形Gd晶格和蜂窝状AlGe晶格构成。它在超薄膜中稳定，厚度可达5个单层。在较厚的薄膜中，会出现额外的非所需相。超薄膜的结构质量通过电子衍射、X射线衍射以及电子显微镜得到证实。磁化测量检测到各向异性的铁磁态。GdAlGe的磁性通过电子输运研究得到佐证，该研究揭示了反常霍尔效应和负磁电阻。该材料与作为技术半导体的Ge自然集成，应有助于应用。本研究可作为通过多晶型工程设计层状磁体的蓝图。
英文摘要
The recent advances in research on layered magnets have established them as invaluable materials for spintronic applications and precursors to 2D magnets. The problem is that the number of such materials available for experimentation is still low. To tackle the problem, one may employ phase engineering; in particular, the interplay between the phase stability and dimensionality provides great opportunities for design of layered magnets. Here, this interrelation is harnessed to produce epitaxial films of an overlooked layered polymorph of GdAlGe. The compound is formed by alternating triangular Gd and honeycomb AlGe lattices. It is stable in ultrathin films, up to 5 monolayers. In thicker films, an additional unwanted phase emerges. The structural quality of the ultrathin films is witnessed by electron and X-ray diffraction as well as electron microscopy. Magnetization measurements detect an anisotropic ferromagnetic state. The GdAlGe magnetism is corroborated by a study of electron transport revealing the anomalous Hall effect and negative magnetoresistance. The material is naturally integrated with Ge, a technological semiconductor, which should facilitate applications. The present study can serve as a blueprint for design of layered magnets via polymorph engineering.
Comments19 pages, 5 figures
