High resolution Kerr microscopy has been used to study newly developed Co25Pt75 alloy films with perpendicular magnetic anisotropy. In particular, the dynamics of magnetization reversal processes wase investigated by means of time resolved domain pattern analysis. Domain wall motion dominated magnetization reversal as well as nucleation dominated processes were observed. Magnetic aftereffect phenomena were confirmed by relaxation measurements of magnetic domains. The fractal dimension of the observed domains is correlated to the macroscopic coercivity determined from hysteresis loop measurements.
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T, K., W.S, K., J, V. et al. Magnetization Reversal in CoPt Magnetooptic Recording Alloys. MRS Online Proceedings Library 313, 315–319 (1993). https://doi.org/10.1557/PROC-313-315