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Thermally assisted domain wall motion of perpendicular Co/Pt multilayers was characterized by observing domain expansion using a Kerr microscope and measuring magnetization decay curves. Unlike conventional longitudinal recording media, the viscosity coefficient was found to be highly time dependent over a large range. Activation energies of the domain wall motion were found to be in the range from 60 to 140 kT for the samples examined. A simple model was developed to determine the thermal stability of a circular domain in Co/Pt multilayers and used to project the stability of circular domains in these materials. Based upon the data collected, circular domains with diameter down to 20 nm are predicted to be thermally stable with a relaxation time constant of greater than 10 years.
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Chen et al. (1999) studied this question.
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