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. 2015 Sep 23;6:8275. doi: 10.1038/ncomms9275

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(a) The interaction energy, U₁₂, versus the distance r₁₂ between two skyrmions (black lines with rectangular markers), and skyrmion and antiskyrmion (red lines with circular markers). Solid (dashed) lines show the interaction for equal (opposite) helicities of the topological defects. (b) Metastable skyrmion with the topological charge Q=2. (c) Metastable skyrmion–antiskyrmion crystal with a rectangular lattice. In b and c, colour indicates the topological charge density, ρ_Q, while arrows show the in-plane components of spins.