Bimeron clusters in chiral antiferromagnets
Bimeron clusters in chiral antiferromagnets
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DOI：
10.1038/s41524-020-00435-y
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发表时间：
2020-11-09
影响因子：
9.7
通讯作者：
Zhou, Yan
中科院分区：
文献类型：
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作者：
Li, Xiaoguang;Shen, Laichuan;Zhou, Yan
磁性双翼是磁性天象的平面内拓扑对应。尽管它们在拓扑上是等价的，但它们的静力学和动力学可能是截然不同的，这使得它们从物理和自旋电子应用的角度来看都很有吸引力。在这项工作中，我们证明了在具有界面Dzyaloshinskii-Moriya相互作用(DMI)的反铁磁(AFM)薄膜中双翼孤子和团簇的稳定化。与一般的原子力显微镜孤子一样，双分子粒子表现出高的电流驱动迁移率，同时具有面内和面外极化电流分别激发的各向异性和相对论动力学特性。此外，这些自旋织构可以吸收平移方向上的其他双翼孤子或团簇，从而获得大范围的Neel拓扑数。这种聚集涉及到拓扑结构的重新排列，并引起了静态和动态性质的显著变化。原子力显微镜双翼集群的优点揭示了一条潜在的途径，可以在同一材料系统中统一多比特数据的创建、传输、存储，甚至基于拓扑的计算，并可能刺激自旋电子器件，从而实现数据处理的创新范例。
A magnetic bimeron is an in-plane topological counterpart of a magnetic skyrmion. Despite the topological equivalence, their statics and dynamics could be distinct, making them attractive from the perspectives of both physics and spintronic applications. In this work, we demonstrate the stabilization of bimeron solitons and clusters in the antiferromagnetic (AFM) thin film with interfacial Dzyaloshinskii-Moriya interaction (DMI). Bimerons demonstrate high current-driven mobility as generic AFM solitons, while featuring anisotropic and relativistic dynamics excited by currents with in-plane and out-of-plane polarizations, respectively. Moreover, these spin textures can absorb other bimeron solitons or clusters along the translational direction to acquire a wide range of Neel topological numbers. The clustering involves the rearrangement of topological structures, and gives rise to remarkable changes in static and dynamical properties. The merits of AFM bimeron clusters reveal a potential path to unify multibit data creation, transmission, storage, and even topology-based computation within the same material system, and may stimulate spintronic devices enabling innovative paradigms of data manipulations.