Abstract
This paper reports the fabrication, formation mechanism, nanostructure and magnetic properties of Fe50Co50, Fe65Co35 and Fe50Ni50 (at.%) nanocluster wires (NCWs) with different aspect ratios fabricated by thermal decomposition of metal nitrates and subsequent hydrogen reduction in nanoporous anodized aluminum oxide (AAO) templates. The as-synthesized NCWs have diameters in the range of 80-360 nm, and lengths in the range of 0.5-10 μm. The NCWs are composed of roughly round-shaped nanoclusters in the range of about 5-50 nm in size and a weighted average size of 14 nm with a mixture of single-crystal and poly-crystalline structures. The Fe-Co NCWs have a bcc structure while the Fe50Ni50 NCWs have an fcc structure. An intrinsic coercivity at room temperature iHc of 1.15 kOe was obtained for the Fe65Co35 NCWs. The NCWs exhibit the easy magnetization direction along the length of the nanowires as a result of the shape anisotropy.
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