  The dynamics of magnetic skyrmion driven by spin-polarized current is
theoretically studied in the chiral ferromagnetic film with spatially modulated
Dzyaloshinskii-Moriya interaction. Three cases including linear, sinusoidal,
and periodic rectangular modulations have been considered, where the increase,
decrease, and the periodic modification of the size and velocity of the
skyrmion have been observed in the microscopic simulations. These phenomena are
well explained by the Thiele equation, where an effective force on the skyrmion
is induced by the inhomogeneous Dzyaloshinskii-Moriya interaction. The results
here suggest that the dynamics of skyrmion can be manipulated by artificially
tuning the Dzyaloshinskii-Moriya interaction in chiral ferromagnetic film with
material engineering methods, which will be useful to design skyrmion-based
spintronics devices.
