Abstract
Ordered coral−globular−like cobalt (Co) particles of different sizes and magnetic properties were prepared by electrodeposition. After the passivation of directionally solidified NiAl–W eutectic alloys, W fibers were raised on the surface of NiAl matrix. The Co particles were grown around the protruding W fibers. Cathodic potential experiments indicated that an instantaneous nucleation was generated by the deposition potential of −0.8 V. The interspace of Co was consistent with the interspace of W fibers distributed in the NiAl matrix. With increasing deposition time, the diameter and height of Co particles, coercivity and remanent magnetization increased. Co particles featured a labyrinth domain and their magnetic structures were in multidomain state.
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