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Patterned Media Based on Soft/Hard, Composite Nanowire Array of Ni/CoPt

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5 Author(s)
A. Gapin ; University of California San Diego, La Jolla, CA, USA ; X. Ye ; J. F. Aubuchon ; L. Chen
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A composite nanowire geometry consisting of soft magnetic (Ni) nanowire lower part and hard magnetic (CoPt) L10 nanowire upper part, has been prepared by electrodeposition into anodized aluminum oxide (AAO) nanopores with ~20-30 nm diameter, ~100 nm tall. The as-deposited nanowires within the AAO pores were then annealed at 700 degree C for 1 hour for conversion to L10 phase. The The microstructure and magnetic properties were characterized using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and an alternating gradient magnetometer (AGM). When compared to Ni nanowire and CoPt nanowire coercivity, the two-step Ni/CoPt nanowires exhibit an intermediate coercivity of ~ 1.96 KOe. The decrease in coercivity may be caused by exchange interactions or the interdiffusion during annealing between the Ni and CoPt segments resulting in the formation of a ternary L10 alloy of Co-Pt-Ni.

Published in:

INTERMAG 2006 - IEEE International Magnetics Conference

Date of Conference:

8-12 May 2006