We study skyrmion control in an artificial
ultrathin magnetic film
with perpendicular anisotropy. We simulate numerically the skyrmion
motion induced by spatial gradient of the Dzyaloshinskii–Moriya
interaction (DMI) strength. We show that creating the DMI gradient
is an efficient way to move skyrmions. In particular, experimentally
achievable DMI gradients can be as effective as spin-polarized electric
currents with 1011 A/m2 density. At that, the
DMI gradient induces a much weaker skyrmion Hall effect. The DMI gradient
can be created with a mechanical strain in a ferroelectric–ferromagnetic
hybrid system. This opens an alternative way to manipulate skyrmions.
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