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arXiv 2201.09675cond-mat.mtrl-sci
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非手征中心对称helimagnet中短周期螺旋自旋序和磁跃迁的观测

Observation of short-period helical spin order and magnetic transition in a non-chiral centrosymmetric helimagnet

Bei Ding, Jun Liu, Hang Li, Jinjing Liang, Jie Chen, Zefang Li, Xue Li, Xuekui Xi, Zhenxiang Cheng, Jianli Wang, Yuan Yao, Wenhong Wang

摘要:

对呈现纳米级螺旋秩序的材料的研究继续受到涌现电感器的承诺的推动。尽管在许多材料中已经报道了这种自旋织构,但它们中的大多数表现出长周期或仅限于远低于室温的操作。在这里,我们提出了一个有序的螺旋自旋秩序的周期为3.2 nm的非手性中心对称helimagnet MnCoSi在室温下通过多角度和多方位的方法洛仑兹透射电子显微镜(TEM)的实空间观察。从有序的螺旋自旋顺序的摆线自旋顺序低于228 K的磁过渡清楚地揭示了原位中子粉末衍射和洛伦兹TEM,这是密切相关的温度引起的磁晶各向异性的变化。这些结果揭示了非手征中心对称helimagnet中螺旋有序自旋织构的起源,为寻找具有纳米级自旋有序的材料提供了一种新的策略,在涌现电磁学中具有潜在的应用价值.

英文摘要:

The search for materials exhibiting nanoscale spiral order continues to be fuelled by the promise of emergent inductors. Although such spin textures have been reported in many materials, most of them exhibit long periods or are limited to operate far below room temperature. Here, we present the real-space observation of an ordered helical spin order with a period of 3.2 nm in a non-chiral centrosymmetric helimagnet MnCoSi at room temperature via multi-angle and multi-azimuth approach of Lorentz transmission electron microscopy (TEM). A magnetic transition from the ordered helical spin order to a cycloidal spin order below 228 K is clearly revealed by in situ neutron powder diffraction and Lorentz TEM, which is closely correlated with temperature-induced variation in magneto-crystalline anisotropy. These results reveal the origin of spiral ordered spin textures in non-chiral centrosymmetric helimagnet, which can serve as a new strategy for searching materials with nanoscale spin order with potential applications in emergent electromagnetism.

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