Three-dimensional structure and formation mechanism of biskyrmions in uniaxial ferromagnets

Abstract

Magnetic biskyrmions are observed in experiments but their existences are still under debate. In this work, we present the existence of biskyrmions in a magnetic film with tilted uniaxial anisotropy via micromagnetic simulations. We find biskyrmions and bubbles share a unified three-dimensional structure, in which the relative position of two intrinsic Bloch points dominates the two-dimensional topological property in the film middle. The film edge can drive Bloch points and transform bubbles into biskyrmions via the demagnetizing field. This mechanism is found in the formation process of biskyrmions in confined geometry under zero field. Our work clarifies the structure and formation mechanism of biskyrmions, emphasizing the three-dimensional aspect of skyrmion-related nanostructures.

6 pages, 4 figures

References in corpus (3)

• Tailoring magnetic energies to form dipole skyrmions and skyrmion lattices
• Spirit: Multifunctional Framework for Atomistic Spin Simulations
• Stability and dynamics of in-plane skyrmions in collinear ferromagnets

Cited by in corpus (5)

• Discovery of a Bloch point quadrupole constituting hybrid topological strings
• Photonic torons, topological phase transition and tunable spin monopoles
• Sewing skyrmion and antiskyrmion by quadrupole of Bloch points
• Observation of Hybrid Magnetic Skyrmion Bubbles in Fe3Sn2 Nanodisks
• Stabilized biskyrmion states in annealed CoFeB bilayer with different interfaces