| Abstract
| - We report fabrication of CoCr binary nanocluster wires (NCWs) by thermally decomposingCo2(CO)8/Cr(CO)6 metal carbonyl vapors by using a resistive heater placed in the middle ofa pair of permanent disk magnets. In general, NCWs grow through the pile-up of binaryCoCr nanoclusters perpendicularly to the substrates attached to the magnet surfaces. NCWs,ranging from 10 to 20 nm in diameter and also branching out while they grow, exist as abundle. The bundles with lengths up to 2−3 mm form a three-dimensional array. We observedmuch higher coercivities and larger remanences for arrays with magnetic field appliedparallel to the NCWs than those with magnetic field applied perpendicular to the NCWs.Importantly, we observed that arrays of CoCr NCWs with a 0.8−2.2 mol % Cr in which onlyCo-rich phase exists showed enhanced magnetic properties, that is, nearly doubled coercivitiescompared to that of the array of pure Co NCWs. When the Cr mole percentage is above 2.2,however, coercivities decreased because the amount of nonmagnetic Cr-rich phase increasedaccordingly.
- The array of Co99.2Cr0.8 binary nanocluster wires (NCWs) is fabricated by thermally decomposing Co2(CO)8/Cr(CO)6 metal carbonyl vapors with a resistive heater placed in the middle of a pair of permanent disc magnets. The diameter of individual NCWs ranges from 10 to 20 nm and the NCWs exist as bundles with their length up to 2−3 mm. This array shows nearly doubled coercivity compared to that of pure Co NCWs.
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