Domain wall relaxation, creep, sliding, and switching in superferromagnetic discontinuous Co(80)Fe(20)/Al(2)O3 multilayers.
The ac susceptibility of a superferromagnetic discontinuous multilayer [Co(80)Fe20(1.4 nm)/Al(2)O3(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.
Chen
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X
Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität, Duisburg, D-47048 Duisburg, Germany.
Sichelschmidt
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O
Kleemann
W
W
Petracic
O
O
Binek
Ch
Ch
Sousa
J B
JB
Cardoso
S
S
Freitas
P P
PP