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Recently, magnetization reversal has been extensively studied in a number of magnetic films and interestingly, the contrasting behaviors of wall-motion dominant reversal and nucleation dominant one have been reported among similar samples of many systems(1,2]. These reversal behaviors have been analyzed by the thermally activated relaxation model based on Fatuzzo's theory[3,4] and also, compared with the theoretical predictions using micromagnetic simulations(5]. In this paper, we describe a new method to quantitatively analyze the magnetization reversal behaviors considering both the nucleation and wall-motion processes based on the time-dependent domain patterns. Model We modelize the time-dependent domain patterns of magnetization reversal based on circular domains formed by nucleation process and subsequently, expanded by wallmotion process as shown in FIG. 1. The expansion of the circular domain dr in time dt due to the wall-motion process is given by dr V dt, while the number of nucleation dn in time dt is given by dn = R ( s a )dt where V is the wall-motion speed, R is the dn =2 • •

QUANTITATIVE DETERMINATION OF DOMAIN DYANMICS PARAMETERS IN Co/Pd MULTILAYERED MAGNETO-OPTIC RECORDING MEDIA