Topological transitions among skyrmion- and hedgehog-lattice states in cubic chiral magnets
Topological transitions among skyrmion- and hedgehog-lattice states in cubic chiral magnets
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DOI：
10.1038/s41467-019-08985-6
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发表时间：
2019-03-05
影响因子：
16.6
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
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作者：
Fujishiro, Y.;Kanazawa, N.;Tokura, Y.
操纵拓扑自旋织构是探索前所未有的电磁现象的关键。而磁性天际线的切换控制，例如，在Skyrmion-晶格相和常规磁序之间的转变被深入研究，以发展未来的存储器器件概念，但是在具有不同拓扑序的自旋织构之间的转变仍然在很大程度上未被探索。在这里，我们开发了一系列的手性磁体MnSi 1-xGex，作为一个平台之间的转换skyrmion和刺猬晶格状态。通过中子散射、洛仑兹透射电子显微镜和高场输运测量，我们观察到三种不同的自旋拓扑结构，它们随Si/Ge替代控制的晶格常数的变化而变化：在x = 0-0.25范围内的二维Skyrmion晶格和在x = 0.3-0.6和x = 0.7-1范围内的两种不同的三维Hedgehog晶格.在化学压力控制的材料中出现了各种拓扑自旋态，这为通过简单的机械方法直接操纵自旋织构拓扑提供了一条新的途径。
Manipulating topological spin textures is a key for exploring unprecedented emergent electromagnetic phenomena. Whereas switching control of magnetic skyrmions, e.g., the transitions between a skyrmion-lattice phase and conventional magnetic orders, is intensively studied towards development of future memory device concepts, transitions among spin textures with different topological orders remain largely unexplored. Here we develop a series of chiral magnets MnSi1-xGex, serving as a platform for transitions among skyrmion- and hedgehog-lattice states. By neutron scattering, Lorentz transmission electron microscopy and high-field transport measurements, we observe three different topological spin textures with variation of the lattice constant controlled by Si/Ge substitution: two-dimensional skyrmion lattice in x = 0-0.25 and two distinct three-dimensional hedgehog lattices in x = 0.3-0.6 and x = 0.7-1. The emergence of various topological spin states in the chemical-pressure-controlled materials suggests a new route for direct manipulation of the spin-texture topology by facile mechanical methods.