Creep and flow regimes of magnetic domain wall motion in ultrathin Pt/Co/Pt films with perpendicular anisotropy, Metaxas, P.J., Jamet, J.-P., Mougin, A., Cormier, M., Ferré, J., Baltz, V., Rodmacq, B., Dieny, B., Stamps, R.L., Physical Review Letters, 99, 217208 (2007)