Magnetization reversal in nanostructured Co/Pd multilayers

We report the experimental results on magnetization reversal in Co/Pd multilayers. Interestingly enough, reversal phenomena in this system were found to be strongly dependent on the magnetic properties varied with the Co-sublayer thickness. Direct domain observations and magnetization viscosity measurements revealed that wall motion was dominant In the samples having 2-Angstrom-thick Co sublayer, whereas nucleation was dominant in those having 4-Angstrom-thick Co sublayer. Magnetization reversal was theoretically studied using a nanomagnetic model and the strong dependence of reversal behavior on the magnetic properties could be qualitatively explained.