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Article Dans Une Revue Physical Review B Année : 2020

Asymmetric skyrmion-antiskyrmion production in ultrathin ferromagnetic films

Résumé

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.
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Dates et versions

hal-02933903 , version 1 (29-11-2021)

Identifiants

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Ulrike Ritzmann, Louise Desplat, Bertrand Dupé, Robert E. Camley, Joo-Von Kim. Asymmetric skyrmion-antiskyrmion production in ultrathin ferromagnetic films. Physical Review B, 2020, 102 (17), pp.174409. ⟨10.1103/PhysRevB.102.174409⟩. ⟨hal-02933903⟩
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