Topological-chiral magnetic interactions driven by emergent orbital magnetism.,Nature Communications

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Topological-chiral magnetic interactions driven by emergent orbital magnetism.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-24 , DOI: 10.1038/s41467-019-14030-3
S Grytsiuk ₁ , J-P Hanke ₁ , M Hoffmann ₁ , J Bouaziz ₁ , O Gomonay ₂ , G Bihlmayer ₁ , S Lounis ₁ , Y Mokrousov _{1,

2} , S Blügel ₁

Affiliation

Two hundred years ago, Ampère discovered that electric loops in which currents of electrons are generated by a penetrating magnetic field can mutually interact. Here we show that Ampère's observation can be transferred to the quantum realm of interactions between triangular plaquettes of spins on a lattice, where the electrical currents at the atomic scale are associated with the orbital motion of electrons in response to the non-coplanarity of neighbouring spins playing the role of a magnetic field. The resulting topological orbital moment underlies the relation of the orbital dynamics with the topology of the spin structure. We demonstrate that the interactions of the topological orbital moments with each other and with the spins form a new class of magnetic interactions [Formula: see text] topological-chiral interactions [Formula: see text] which can dominate over the Dzyaloshinskii-Moriya interaction, thus opening a path for realizing new classes of chiral magnetic materials with three-dimensional magnetization textures such as hopfions.

中文翻译：

新兴的轨道磁性驱动的拓扑-手性磁性相互作用。

两百年前，安培（Ampère）发现，通过穿透磁场产生电子电流的电回路可以相互相互作用。在这里，我们证明了安培的观测可以转移到晶格上自旋的三角形小块之间相互作用的量子域，其中原子尺度上的电流与电子的轨道运动有关，以响应相邻自旋的非共面性发挥磁场作用。所产生的拓扑轨道力矩奠定了轨道动力学与自旋结构拓扑之间关系的基础。我们证明拓扑轨道矩彼此之间以及与自旋之间的相互作用形成了一类新的磁相互作用[公式：参见文本]拓扑-手性相互作用[公式：

更新日期：2020-01-24

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