Abstract
Electrodeposition method has allowed the preparation of submicron CoPt particles covered with CoNi shells of different thicknesses. The magnetic properties of these particles have been analysed; a contribution of semi-hard magnetic behaviour and soft-magnetic behaviour, associated with the particles, and the CoNi shell, respectively, has been detected. Although a gradual decrease of the coercivity was observed by increasing the CoNi shell thickness, the CoPt core always dominates the magnetization–magnetic field curve shape.
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