Asymmetric skyrmion-antiskyrmion production in ultrathin ferromagnetic films

Abstract

Ultrathin ferromagnets with frustrated exchange and the Dzyaloshinskii-Moriya interaction can support topological solitons such as skyrmions and antiskyrmions, which are metastable and can be considered particle-antiparticle counterparts. When spin-orbit torques are applied, the motion of an isolated antiskyrmion driven beyond its Walker limit can generate skyrmion-antiskyrmion pairs. Here, we use atomistic spin dynamics simulations to shed light on the scattering processes involved in this pair generation. Under certain conditions a proliferation of these particles and antiparticles can appear with a growth rate and production asymmetry that depend on the strength of the chiral interactions and the dissipative component of the spin-orbit torques. These features are largely determined by scattering processes between antiskyrmions, which can be elastic or result in bound states or annihilation.

7 pages, 6 figures

References in corpus (4)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Fractional statistics in anyon collisions
• Skyrmion knots in frustrated magnets

Cited by in corpus (5)

• Statics and Dynamics of Skyrmions Interacting with Pinning: A Review
• Spin-orbit enabled all-electrical readout of chiral spin-textures
• Metaheuristic conditional neural network for harvesting skyrmionic metastable states
• Design of 2D Skyrmionic Metamaterial Through Controlled Assembly
• Strongly enhanced lifetime of higher-order bimerons and antibimerons