arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0811.0990cond-mat.mtrl-sci
收藏

六角过渡金属表面Fe单层膜的磁性

Intriguing magnetism of Fe monolayers on hexagonal transition-metal surfaces

B. Hardrat, A. Al-Zubi, P. Ferriani, S. Blügel, G. Bihlmayer, S. Heinze

摘要:

利用第一性原理计算,我们证明了Fe单层膜在4d-和5d-过渡金属的六方hcp(0001)和fcc(111)表面上可以呈现非常不同的磁相。由于衬底的d带填充,Fe的最近邻交换耦合从Tc、Re、Ru和Os上的反铁磁性(AFM)逐渐转变为Rh、Ir、Pd和Pt上的铁磁性。结合这些表面的三角形晶格上的拓扑挫折,AFM耦合导致Re和Ru上的Fe的120度Neel结构和Rh上的意想不到的双行AFM结构,这是左旋转和右旋转90度自旋螺旋的叠加。

英文摘要:

Using first-principles calculations, we demonstrate that an Fe monolayer can assume very different magnetic phases on hexagonal hcp (0001) and fcc (111) surfaces of 4d- and 5d-transition metals. Due to the substrates' d-band filling, the nearest-neighbor exchange coupling of Fe changes gradually from antiferromagnetic (AFM) for Fe films on Tc, Re, Ru and Os to ferromagnetic on Rh, Ir, Pd, and Pt. In combination with the topological frustration on the triangular lattice of these surfaces the AFM coupling results in a 120-degree Neel structure for Fe on Re and Ru and an unexpected double-row-wise AFM structure on Rh, which is a superposition of a left- and right-rotating 90-degree spin spiral.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑