Gao N, Je S -G, Im M -Y, Choi J W, Yang M, Li Q, Wang T Y, Lee S, Han H -S, Lee K -S, Chao W, Hwang C, Li J, Qiu Z Q
Key Laboratory of Microelectronic Devices and Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing, 100029, China.
Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA.
Nat Commun. 2019 Dec 6;10(1):5603. doi: 10.1038/s41467-019-13642-z.
Merons which are topologically equivalent to one-half of skyrmions can exist only in pairs or groups in two-dimensional (2D) ferromagnetic (FM) systems. The recent discovery of meron lattice in chiral magnet CoZnMn raises the immediate challenging question that whether a single meron pair, which is the most fundamental topological structure in any 2D meron systems, can be created and stabilized in a continuous FM film? Utilizing winding number conservation, we develop a new method to create and stabilize a single pair of merons in a continuous Py film by local vortex imprinting from a Co disk. By observing the created meron pair directly within a magnetic field, we determine its topological structure unambiguously and explore the topological effect in its creation and annihilation processes. Our work opens a pathway towards developing and controlling topological structures in general magnetic systems without the restriction of perpendicular anisotropy and Dzyaloshinskii-Moriya interaction.
在二维铁磁（FM）系统中，拓扑上等同于斯格明子一半的磁单极子只能成对或成组存在。在手性磁体CoZnMn中最近发现的磁单极子晶格，立刻引发了一个具有挑战性的问题：在连续的FM薄膜中能否产生并稳定存在单个磁单极子对，这是任何二维磁单极子系统中最基本的拓扑结构？利用绕数守恒，我们开发了一种新方法，通过从钴盘进行局部涡旋印记，在连续的坡莫合金薄膜中产生并稳定存在一对磁单极子。通过在磁场中直接观察产生的磁单极子对，我们明确确定了其拓扑结构，并探索了其产生和湮灭过程中的拓扑效应。我们的工作为在不受垂直各向异性和Dzyaloshinskii-Moriya相互作用限制的一般磁系统中开发和控制拓扑结构开辟了一条途径。
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