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arXiv 1901.04854cond-mat.mes-hallcond-mat.str-el
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Re(0001)上Fe单原子链的磁结构:手征多自旋相互作用的出现

Magnetic structure of monatomic Fe chains on Re(0001): emergence of chiral multi-spin interactions

András Lászlóffy, Levente Rózsa, Krisztián Palotás, László Udvardi, László Szunyogh

摘要:

本文采用第一性原理计算方法研究了Fe链在Re(0001)表面的磁性.通过增加链的长度,发现从几乎共线的反铁磁状态的5个原子长的链的自旋螺旋状态与旋转平面从衬底的表面稍微倾斜的15个原子长的链的过渡。结果表明,一个经典的自旋模型来自从头计算只包含两个自旋相互作用支持相反的手性的自旋螺旋相比,直接优化的自旋配置内的从头计算方法。通过在自旋模型中引入手征四自旋相互作用,可以理解两种方法结果之间的差异。

英文摘要:

We present results of first-principles calculations of the magnetic properties of Fe chains deposited on the Re(0001) surface. By increasing the length of the chain, a transition is found from an almost collinear antiferromagnetic state for a 5-atom-long chain to a spin spiral state with the rotational plane slightly tilted from the surface of the substrate for the 15-atom-long chain. It is shown that a classical spin model derived from the ab initio calculations containing only two-spin interactions supports opposite chirality of the spin spiral compared to a direct optimization of the spin configuration within the ab initio method. The differences between the results of the two methods can be understood by introducing chiral four-spin interactions in the spin model.

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。

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