Domain wall relaxation, creep, sliding, and switching in superferromagnetic discontinuous Co80Fe20/Al2O3 multilayers -: art. no. 137203

The ac susceptibility of a superferromagnetic discontinuous multilayer [Co80Fe20(1.4 nm)/Al2O3(3 nm)](10) is measured as a function of temperature, frequency, and field amplitude and compared to static and dynamic hysteresis loops. Its properties are successfully mapped onto the predicted [T. Nattermann, V. Pokrovsky, and V. M. Vinokur, Phys. Rev. Lett. 87, 197005 (2001).] dynamical phase transitions, which link the relaxation, creep, sliding, and switching regimes of pinned domain walls.