Twisted domain walls and skyrmions in perpendicularly magnetized multilayers

Abstract

We present an analytical theory to describe three-dimensional magnetic textures in perpendicularly magnetized magnetic multilayers that arise in the presence of magnetostatic interactions and the Dzyaloshinskii-Moriya interaction (DMI). We demonstrate that domain walls in multilayers develop a complex twisted structure, which persists even for films with strong DMI. The origin of this twist is surface-volume stray field interactions that manifest as a depth-dependent effective field whose form mimics the DMI effective field. We find that the wall twist has a minor impact on the equilibrium skyrmion or domain size, but can significantly affect current-driven dynamics. Our conclusions are based on the derived analytical expressions for the magnetostatic energy and confirmed by micromagnetic simulations.

arXiv comment30 pages, 8 figures

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• Controlled Evolution of Three-Dimensional Magnetic States in Strongly Coupled Cylindrical Nanowire Pairs
• Discovery of a Bloch point quadrupole constituting hybrid topological strings
• Quantitative imaging of hybrid chiral spin textures in magnetic multilayer systems by Lorentz microscopy
• Magnetic chirality controlled by the interlayer exchange interaction
• Walker breakdown with a twist: Dynamics of multilayer domain walls and skyrmions driven by spin-orbit torque
• Tuneable terahertz oscillation arising from Bloch-point dynamics in chiral magnets
• Tailored flux pinning in superconductor/ferromagnet multilayers with engineered magnetic domain morphology from stripes to skyrmions
• Lorentz TEM investigation of chiral spin textures and Néel Skyrmions in asymmetric [Pt/(Co/Ni)${}_M$/Ir]${}_N$ multi-layer thin films
• Control of stripe domain wall magnetization in perpendicular anisotropy multilayers
• Three-Dimensional Structure of Hybrid Magnetic Skyrmions Determined by Neutron Scattering
• Direct observation of Néel-type skyrmions and domain walls in a ferrimagnetic DyCo${}_3$ thin film
• Magnetization Reversal Signatures of Hybrid and Pure Néel Skyrmions in Thin Film Multilayers
• Stabilizing chiral spin-structures via an alternating Dzyaloshinskii-Moriya interaction
• Determination of the energy of the Dzyaloshinskii-Moriya interaction in [Co/Pd(111)]5 superlattices with different Co thickness by micromagnetic simulations of labyrinth domain structures
• Role of magnetic skyrmions for the solution of the shortest path problem
• Field-driven collapsing dynamics of skyrmions in magnetic multilayers
• Factors affecting the topological Hall effect in strongly correlated layered magnets: spin of the magnetic atoms, polar and azimuthal angle subtended by the spin texture
• Hybrid Skyrmions in Magnetic Multilayer Thin Films are Half-Integer Hopfions
• Skyrmion stacking in stray field-coupled ultrathin ferromagnetic multilayers