Monte Carlo and micromagnetic study on constructing biskyrmion-like spin textures in bilayer magnetic films

Biskyrmion, a novel topological magnetic structure, has its unique physical properties and potential application value. In this study, we proposed a mechanism for constructing biskyrmions in a bilayer centrosymmetric magnetic thin film with the broken inversion symmetry for each layer. By using Monte Carlo and micromagnetic simulation methods, we found that biskyrmion-like spin textures can be stabilized under the opposite Dzyaloshinskii–Moriya interactions and finite magnetic fields applied. In addition, we also provided insights into the dynamic property of a biskyrmion with the spin polarized current applied to the system. After the current density reaches a certain threshold, the biskyrmion moves forward in a bound state and exhibits a behavior similar to the skyrmion Hall effect. Our findings have provided a theoretical basis for the application of biskyrmions in spintronics.