We discuss results of finite-temperature Monte Carlo simulation for the switching field of multilayers of hard and soft magnets. The maximum of the energy product as a function of the soft layer thickness is very weak and becomes weaker as the temperature is increased. However, the maximum becomes more pronounced for the energy product cost as a function of the soft layer thickness. The effect of the dipolar interaction is significant but does not change the qualitative trend of the coercive field as a function of the soft layer thickness.
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Ma et al. (2000) studied this question.
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