We report an experimental observation that indicates that a direct relation exists between the
speed of the magnetic domain-wall (DW) motion and the magnitude of the perpendicular
magnetic anisotropy (PMA) in Pt/Co/Pt films. It is found that by changing the thicknesses of
the nonmagnetic Pt layers, the PMA magnitude can be varied significantly and the field-
driven DW speed can also be modified by a factor of up to 50 under the same magnetic field.
Interestingly, the DW speed exhibits a clear scaling behavior with respect to the PMA …