  The perpendicular magnetic anisotropy K$_e$$_f$$_f$, magnetization reversal,
and field-driven domain wall velocity in the creep regime are modified in
Pt/Co(0.85-1.0 nm)/Pt thin films by strain applied via piezoelectric
transducers. K$_e$$_f$$_f$, measured by the extraordinary Hall effect, is
reduced by 10 kJ/m$^3$ by tensile strain out-of-plane {\epsilon}$_z$ = 9 x
10-4, independently of the film thickness, indicating a dominant volume
contribution to the magnetostriction. The same strain reduces the coercive
field by 2-4 Oe, and increases the domain wall velocity measured by wide-field
Kerr microscopy by 30-100 %, with larger changes observed for thicker Co
layers. We consider how strain-induced changes in the perpendicular magnetic
anisotropy can modify the coercive field and domain wall velocity.
