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By using the recently developed alternating-gradient magnetometer, that combines very high sensitivity and measurement rapidity, we have made observations of magnetic aftereffect in ferromagnetic films of a few atomic layers. These Co films have a perpendicular easy axis due to a large interface anisotropy and square hysteresis loop. The study of the field dependence of the relaxation rate gives information on the activation energy. The results are discussed in connection with the possible existence of domains and wall motion.
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Bayreuther et al. (1989) studied this question.
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