Multiple-q noncollinear magnetism in an itinerant hexagonal magnet.
Multiple-q noncollinear magnetism in an itinerant hexagonal magnet.
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DOI：
10.1126/sciadv.aau3402
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发表时间：
2018-11
期刊：
影响因子：
13.6
通讯作者：
Seki S
中科院分区：
文献类型：
--
作者：
Takagi R;White JS;Hayami S;Arita R;Honecker D;Rønnow HM;Tokura Y;Seki S
中子散射实验揭示了巡游磁体中非共线磁序的六方晶化形式。多重q自旋序，即，由多个共存的磁调制矢量Q表征的自旋织构最近作为非平凡磁拓扑和相关涌现现象的来源而引起关注。一个典型的例子是在非中心对称磁体中由Dzyaloshinskiii-Moriya相互作用稳定的三q skyrmion晶格态，而根据最新的理论，预计会出现各种不同起源的多q态。在这里，我们研究了巡游极性六方磁体Y3 Co 8 Sn 4的磁结构，其中几个独特的有利于多q态的机制被允许变得活跃。小角度中子散射实验表明，形成无公度的三重q磁序与面内涡旋状的自旋纹理，这可以最一致地解释在新的四自旋相互作用机制固有的巡回磁铁。目前的研究结果表明，一种新的途径来实现奇异的多Q订单和巡回六角磁铁，包括R3 M8 Sn 4家庭具有广泛的化学可调谐性，可以是一个独特的材料平台，以探索其丰富的相图。
Neutron-scattering experiments reveal a hexagonally crystallized form of noncollinear magnetic order in an itinerant magnet. Multiple-q spin order, i.e., a spin texture characterized by a multiple number of coexisting magnetic modulation vectors q, has recently attracted attention as a source of nontrivial magnetic topology and associated emergent phenomena. One typical example is the triple-q skyrmion lattice state stabilized by Dzyaloshinskii-Moriya interactions in noncentrosymmetric magnets, while the emergence of various multiple-q states of different origins is expected according to the latest theories. Here, we investigated the magnetic structure of the itinerant polar hexagonal magnet Y3Co8Sn4, in which several distinctive mechanisms favoring multiple-q states are allowed to become active. Small-angle neutron-scattering experiments suggest the formation of incommensurate triple-q magnetic order with an in-plane vortex-like spin texture, which can be most consistently explained in terms of the novel four-spin interaction mechanism inherent to itinerant magnets. The present results suggest a new route to realizing exotic multiple-q orders and that itinerant hexagonal magnets, including the R3M8Sn4 family with wide chemical tunability, can be a unique material platform to explore their rich phase diagrams.
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