Abstract
Arrays of Fe1-xCox (0.0⩽x⩽0.92) nanowires havebeen prepared by an electrochemical process, co-depositing Fe and Coatoms into the pores of anodic aluminium; their compositions weredetermined by atomic absorption spectroscopy. Transmission electronmicroscope results show that the nanowires are regularly spaced anduniform in shape with lengths of about 7.5 µm and diameters of20 nm. The x-ray diffraction indicates a texture in the depositednanowires. For the composition below 82 at.% cobalt, the nanowireshad a body-centred-cubic structure with a [110] preferredorientation. For the 92 at.% cobalt sample, the alloy exhibited amixture of bcc and face-centred-cubic structure. The roomtemperature 57Fe Mössbauer spectra of the arrays ofFe1-xCox nanowires have second and fifth absorption linesof the six-line pattern with almost zero intensity, indicating thatthe internal magnetic field in the nanowires lies along the longaxis of the nanowire. The maximum values of the hyperfine field(Bhf = 36.6±0.1 T) and isomer shift (IS = 0.06±0.01 mm s-1) occur for 44 at.% cobalt. The variations of theisomer shift and the linewidths with composition indicate that theFe1-xCox alloy nanowires around the equiatomic compositionare in an atomistic disordered state.
Published Version
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