Abstract
Skyrmions and antiskyrmions are swirling topological magnetic textures realized as emergent particles in magnets. A skyrmion is stabilized by the Dzyaloshinskii–Moriya interaction in chiral magnets and/or a dipolar interaction in thin film magnets, which prefer the twist of the magnetic moments. Here we show by a numerical simulation of the Landau–Lifshitz–Gilbert equation that pairs of skyrmions and antiskyrmions are created from the helix state as the magnetic field is increased. Antiskyrmions are unstable and disappear immediately in chiral magnets, whereas they are metastable and survive in dipolar magnets. The collision between a skyrmion and an antiskyrmion in a dipolar magnet is also studied. It is found that the collision depends on their relative direction, and the pair annihilation occurs in some cases and only the antiskyrmion is destroyed in the other cases. These results indicate that the antiskyrmion offers a unique opportunity to study particles and antiparticles in condensed-matter systems.
Highlights
Skyrmions and antiskyrmions are swirling topological magnetic textures realized as emergent particles in magnets
Skyrmions[4] are a swirling magnetic texture recently found in chiral magnets and identified in dipolar magnets, characterized by a topological integer called the skyrmion number Nsk, attracts intensive interest both theoretically and experimentally[5]
The magnetic texture distorts from those described by equations (2–4) and Y depends on j to reduce the radius of the antiskyrmion for j 1⁄4 0, p and energy cost
Summary
Skyrmions and antiskyrmions are swirling topological magnetic textures realized as emergent particles in magnets. This is a topological phase transition in the magnetic texture; that is, the skyrmion number Nsk is zero in the single-q helix state but Nska[0] in the SkX.
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