The film structures and magnetic properties of Co/Pt multilayers prepared by magnetron sputtering are examined. The multilayer consists of columns of 50 approximately 100 AA diameter grown vertically to the film plane, and the coercive field becomes smaller with decreasing thickness ratio of Co to Pt layers and with decreasing also total film thickness. The coercivity, however, can be enlarged up to about 3 kOe by a Pt underlayer even in ultrathin Co/Pt films. The magnetization process and the behaviour of the magnetic domains are explained by the mixing mode of the wall motion and the moment rotation.>
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Honda et al. (1990) studied this question.
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