Topological-chiral magnetic interactions driven by emergent orbital magnetism
Topological-chiral magnetic interactions driven by emergent orbital magnetism
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DOI：
10.1038/s41467-019-14030-3
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发表时间：
2020-01-24
影响因子：
16.6
通讯作者：
Bluegel, S.
中科院分区：
文献类型：
--
作者：
Grytsiuk, S.;Hanke, J. -P.;Bluegel, S.
两百年前，安培发现，由穿透磁场产生电子电流的电环可以相互作用。在这里，我们证明了安培的观测可以转移到晶格上三角自旋之间相互作用的量子领域，其中原子尺度上的电流与电子的轨道运动相关联，以响应起磁场作用的相邻自旋的非共面。由此得到的拓扑轨道矩支持轨道动力学与自旋结构拓扑之间的关系。我们证明了拓扑轨道矩之间的相互作用以及与自旋的相互作用形成了一类新的磁相互作用--拓扑-手性相互作用，这种相互作用可以超过Dzyaloshinskii-Moriya相互作用，从而为实现具有三维磁化织构的新型手性磁性材料(如Hopfions)开辟了一条道路。
Two hundred years ago, Ampere discovered that electric loops in which currents of electrons are generated by a penetrating magnetic field can mutually interact. Here we show that Ampere'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 - topological-chiral interactions - 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.