  Competing magnetic anisotropies in chiral crystals with Dzyaloshinskii Moriya
exchange interactions can give rise to non-trivial chiral topological
magnetisation configurations with new and interesting properties. One such
configuration is the magnetic soliton, where the moment continuously rotates
about an axis. This magnetic system can be considered to be one dimensional
and, because of this, it supports a macroscale coherent magnetisation, giving
rise to a tunable chiral soliton lattice (CSL) that is of potential use in a
number of applications in nanomagnetism and spintronics. In this work we
characterise the transitions between the forced-ferromagnetic (F-FM) phase and
the CSL one in CrNb$_3$S$_6$ using differential phase contrast imaging in a
scanning transmission electron microscope, conventional Fresnel imaging,
ferromagnetic resonance spectroscopy, and mean-field modelling. We find that
the formation and movement of dislocations mediate the formation of CSL and
F-FM regions and that these strongly influence the highly hysteretic static and
dynamic properties of the system. Sample size and morphology can be used to
tailor the properties of the system and, with the application of magnetic
field, to locate and stabalise normally unstable dislocations and modify their
dimensions and magnetic configurations in ways beyond that predicted to occur
in uniform films.
