Skyrmion Clusters From Bloch Lines in Ferromagnetic Films

Abstract

Conditions under which various skyrmion objects emerge in experiments on thin magnetic films remain largely unexplained. We investigate numerically centrosymmetric spin lattices in films of finite thickness with ferromagnetic exchange, magnetic anisotropy, and dipole-dipole interaction. Evolution of labyrinth domains into compact topological structures on application of the magnetic field is found to be governed by the configuration of Bloch lines inside domain walls. Depending on the combination of Bloch lines, the magnetic domains evolve into individual skyrmions, biskyrmions, or more complex topological objects. While the geometry of such objects is sensitive to the parameters, their topological charge is uniquely determined by the topological charge of Bloch lines inside the magnetic domain from which the object emerges.

References in corpus (2)

• Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition
• Magnetic skyrmions and skyrmion clusters in the helical phase of Cu${}_2$OSeO${}_3$

Cited by in corpus (9)

• Skyrmion-Skyrmion Interaction in a Magnetic Film
• Stability of Biskyrmions in Centrosymmetric Magnetic Films
• Writing Skyrmions with a Magnetic Dipole
• Thermal Creation of Skyrmions in Ferromagnetic Films with Perpendicular Anisotropy and Dzyaloshinskii-Moriya Interaction
• Biskyrmions Lattices in Centrosymmetric Magnetic Films
• Nematic and smectic stripe phases and stripe-SkX transformations
• Multistep Bloch-line-mediated Walker breakdown in ferromagnetic strips
• Topological charge analysis of dynamic process of transition to Néel-type skyrmion: role of domain wall skyrmions
• Monte Carlo studies of skyrmion stabilization under geometric confinement and uniaxial strain