The skyrmion-bubble transition in a ferromagnetic thin film

Abstract

Magnetic skyrmions and bubbles, observed in ferromagnetic thin films with perpendicular magnetic anisotropy, are topological solitons which differ by their characteristic size and the balance in the energies at the origin of their stabilisation. However, these two spin textures have the same topology and a continuous transformation between them is allowed. In the present work, we derive an analytical model to explore the skyrmion-bubble transition. We evidence a region in the parameter space where both topological soliton solutions coexist and close to which transformations between skyrmion and bubbles are observed as a function of the magnetic field. Above a critical point, at which the energy barrier separating both solutions vanishes, only one topological soliton solution remains, which size can be continuously tuned from micrometer to nanometer with applied magnetic field.

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• Room temperature skyrmions at zero field in exchange-biased ultrathin films
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• Proposal for a micromagnetic standard problem for materials with Dzyaloshinskii-Moriya interaction
• Synthetic chiral magnets promoted by the Dzyaloshinskii-Moriya interaction
• Modeling the shape of axisymmetric skyrmions in magnetic multilayers
• Universality of annihilation barriers of large magnetic skyrmions in chiral and frustrated magnets
• Formation of Néel Type Skyrmions in an Antidot Lattice with Perpendicular Magnetic Anisotropy
• A quantitative description of skyrmions in ultrathin ferromagnetic films and rigidity of degree $\pm 1$ harmonic maps from ${\mathbb{R}}^2$ to ${\mathbb{S}}^2$
• Atomistic perspective of long lifetimes of small skyrmions at room temperature
• Material systems for FM-/AFM-coupled skyrmions in Co/Pt-based multilayers
• Mapping different skyrmion phases in double wedges of Ta/FeCoB(tFeCoB)/Ta(tTa)Ox
• Magnetic domain walls of the van der Waals material Fe${}_3$GeTe${}_2$
• Skyrmion instabilities and distorted spiral states in a frustrated chiral magnet
• Unveiling the emergent traits of chiral spin textures in magnetic multilayers
• Skyrmion generation from irreversible fission of stripes in chiral multilayer films
• Chiral magnetic skyrmions across length scales
• Computational search for ultrasmall and fast skyrmions in the Inverse Heusler family
• Theory of magnetic field-stabilized compact skyrmions in thin film ferromagnets
• Multifunctional Oxides for Topological Magnetic Textures by Design
• Chiral breakdown engineered by mesoscale Dzyaloshinskii-Moriya interaction in biaxial magnetic nanotubes