Fractal analysis of time‐resolved magnetic domain patterns in Co/Pd multilayer with varying number of repeats

We investigate the fractal behavior of magnetic domain together with analysis of dynamic reversal behavior in Co/Pd multilayer films prepared with different number of repeats n . We utilize a novel magneto‐optical microscope magnetometer technique to visualize the time‐resolved domain evolution patterns in these films. Quantitative analysis of the time‐resolved domain evolution patterns allows us to determine the fractal dimension D f and the reversal ratio V / R depending on n , where V / R represents the counterbalance between the wall‐motion speed V and the nucleation rate R . As n increases, domain shape becomes more ragged and complex and thus, D f increases. Interestingly enough, the change in D f clearly seems to be coupled to the change in V / R with varying n , which implies that the correlation between D f and V / R is mediated via the distributed defects. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)