Magnetostatic interaction between two bubble skyrmions

Abstract

A detailed analytic and numerical analysis of the interaction between two bubble skyrmions has been carried out. Results from micromagnetic calculations show a strong dependence of the parameters of the skyrmion magnetic profile as a function of the magnetostatic interaction. The magnetic core and edge-width sizes of the skyrmion increase or decrease depending on the relative position between the skyrmions and the uniaxial perpendicular anisotropy. In particular, when a magnetic disk is over another, there is a transition from a Bloch-like skyrmion configuration to a Néel-like skyrmion configuration as the distance between the disks decreases, as a consequence of the magnetostatic interaction. Therefore, it is possible to stabilize a bubble skyrmion with a Néel configuration without the Dzyaloshinskii-Moriya interaction. Thus, these results can be used for the parameters control of the skyrmions in magnetic spintronic devices that need to use these configurations. 2/1311/13

Dynamics of magnetic system formed by two semi-skyrmions in circular nano-pillars with a perpendicular anisotropy

“…When the current (J = 3.27 × 10 11 A m −2 ) and magnetic field (B = 0.34 T) is applied perpendicular to the free layer plane (figure 1(a)), two semi-skyrmions become generated at its border. There will be a repulsive force between two semiskyrmion [30][31][32][33]. When the distance between the two semiskyrmions is too large, the repulsive force becomes negligible.…”