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Open Access Publications from the University of California

Creation and annihilation of topological meron pairs in in-plane magnetized films.

  • Author(s): Gao, N
  • Je, S-G
  • Im, M-Y
  • Choi, JW
  • Yang, M
  • Li, Q
  • Wang, TY
  • Lee, S
  • Han, H-S
  • Lee, K-S
  • Chao, W
  • Hwang, C
  • Li, J
  • Qiu, ZQ
  • et al.

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 Co8Zn9Mn3 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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