  Magneto-optical Kerr effect (MOKE) microscopy measurements of magnetic bubble
domains demonstrate that Ar+ irradiation around 100 eV can tune the
Dzyaloshinskii-Moriya interaction (DMI) in Pt/Co/Pt trilayers. Varying the
irradiation energy and dose changes the DMI sign and magnitude separately from
the magnetic anisotropy, allowing tuning of the DMI while holding the coercive
field constant. This simultaneous control emphasizes the different physical
origins of these effects. To accurately measure the DMI, we propose and apply a
physical model for a poorly understood peak in domain wall velocity at zero
in-plane field. The ability to tune the DMI with the spatial resolution of the
Ar+ irradiation enables new fundamental investigations and technological
applications of chiral nanomagnetics.
