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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
Nature communications, 12/2019, Letnik: 10, Številka: 1Journal Article
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 Co Zn Mn 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.
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