Correlation between fractal dimension and reversal behavior of magnetic domain in Co/Pd nanomultilayers

Kim, Dong-Hyun; Cho, Yoon-Chul; Choe, Sug-Bong; Shin, Sung-Chul
May 2003
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3698
Academic Journal
We report the experimental finding that there is a close correlation between fractal geometry and reversal mechanism of magnetic domain in Co/Pd nanomultilayers. We have measured the fractal dimension D[sub f] of magnetic domain as well as the wall-motion speed V, the nucleation rate R, and the reversal ratio V/R in Co/Pd nanomultilayer films during magnetization reversal via time-resolved direct domain observation. Interestingly enough, D[sub f] is inversely related to the reversal ratio V/R, which could be quantitatively explained using a micromagnetic simulation based on thermally activated relaxation model. We find that the fractal dimension is a crucial parameter to characterize magnetization reversal behavior as well as jaggedness of domain geometry.


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