Arrays of ferromagnetic iron and cobalt nanocluster wires

We report a fabrication of arrays of ferromagnetic iron and cobalt nanocluster wires (NCWs), ranging from 8 to 10 nm in diameter and up to a few millimeters in length. The iron and the cobalt nanoclusters served as building blocks of the corresponding ferromagnetic NCWs. The iron and the cobalt nanoclusters were produced by thermally decomposing the corresponding metal carbonyl vapors with a resistive heater placed in the middle of a pair of permanent disk magnets. The NCWs were produced through pile-up of metallic nanoclusters along lines of magnetic flux, perpendicularly to the substrates attached to a pair of permanent disk magnet surfaces. We observed coercivities as large as 248 and 964 oersteds and remanences as high as 61 and 71% for the ferromagnetic iron and cobalt NCWs, respectively.