Compositionally graded Fe_(1−x)-Pt_(x) nanowires produced by alternating current electrodeposition into alumina templates

Fe_(1−x)-Pt_(x) (0rms and a frequency of 50 Hz, produces nanowires with nearly stoichiometric composition (Fe₄₂Pt₅₈) and a reasonably good uniformity of pore filling. However, there is a gradual change of composition in Fe-Pt alloy nanowires along the length under certain AC parameters. The observed dependency of alloy composition on the deposition voltage and frequency of AC electrodeposition is explained by an interplay between reduction potentials and diffusion coefficients of Fe and Pt ions which makes FePt system able to access compositionally graded nanowires. Magnetic measurements of nanowires of as-deposited nanowires confirm that maximum coercivity of 1.55 kOe is observed for nearly stoichiometric composition which increases up to 1.81 kOe after thermal annealing at 550 °C. - Graphical abstract: Evaluation of synthesizing extrinsic parameters (such as deposition voltages and frequency) and intrinsic parameters (diffusion coefficient and reduction potential of ion species) in compositionally graded Fe_(1−x)-Pt_(x) nanowires prepared by alternating current electrodeposition into alumina templates.