Micromagnetics of anti-skyrmions in ultrathin film

Micromagnetics of anti-skyrmions in ultrathin films

Lorenzo Camosi, Nicolas Rougemaille, Olivier Fruchart (SPINTEC), Jan Vogel, Stanislas Rohart (LPS)
(Submitted on 13 Dec 2017)

We present a combined analytical and numerical micromagnetic study of the equilibrium energy, size and shape of anti-skyrmionic magnetic configurations. Anti-skyrmions and skyrmions are compared in systems with the same strength of magnetic interactions. Anti-skyrmions may be stabilized when the magnetic circular symmetry is broken due to the inversion of the chirality between perpendicular directions. Despite this symmetry breaking, if the dipolar interactions are neglected the skyrmion and the anti-skyrmion have the same energy and size. However, when dipolar interactions are considered, the energy of the anti-skyrmion is strongly reduced and its equilibrium size increased with respect to the skyrmion. This arises from the fact that both magnetic configurations are stable when the magnetic energies almost cancel each other, which means that a small variation of one parameter can drastically change their configuration, size and energy.

https://arxiv.org/abs/1712.04743