Research Papers in Physics and Astronomy


Date of this Version

January 2002


Published in Journal Of Physics: Condensed Matter 14 (2002), pp. 715–721. Copyright © 2002 Institute of Physics/IOP Publishing. Used by permission.


Ni nanowire arrays were produced by electrodeposition of Ni into self-assembled porous anodic alumina templates. With different anodization voltages, the wires show different surface morphologies. The temperature dependence of the coercivity and activation volume of wires with regular shape can be explained by thermal activation over an energy barrier with a 3/2 power dependence on the field. The wires with irregular surface morphologies show abnormal temperature dependences of the coercivity and activation volume. Possible mechanisms for these behaviors are discussed.

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