  The internal and lattice structures of magnetic skyrmions in B20-type FeGe
are investigated using off-axis electron holography. The temperature, magnetic
field and angular dependence of the magnetic moments of individual skyrmions
are analyzed. Whereas the internal skyrmion shape is found to vary with
magnetic field, the inter-skyrmion distance remains almost unchanged in the
lattice phase. The amplitude of the local magnetic moment is found to depend on
temperature, while the skyrmion shape does not. Deviations from a circular to a
hexagonal skyrmion structure are observed in the lattice phase.
