| Summary: | 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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