Magnetic domain wall propagation in a submicron spin-valve stripe:   influence of the pinned layer
  The propagation of a domain wall in a submicron ferromagnetic spin-valve stripe is investigated using giant magnetoresistance. A notch in the stripe efficiently traps an injected wall stopping the domain propagation. The authors show that the magnetic field at which the wall is depinned displays a stochastic nature. Moreover, the depinning statistics are significantly different for head to head and tail-to-tail domain walls. This is attributed to the dipolar field generated in the vicinity of the notch by the pinned layer of the spin-valve. 
J. Briones (LPM), F. Montaigne (LPM), Daniel Lacour (LPM), M. Hehn   (LPM), M. J. Carey, J. R. Childress