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Highly-ordered Fe nanowires (NWs) were successfully electrodeposited in a laboratory made anodic aluminum oxide template with a diameter of 30 nm. The as prepared Fe NWs were used as a substrate to prepare core–shell Fe@Fe 3 O 4  NWs after annealing and hydrogen reduction at high temperature. The phase transformation of the oxide shell of electrodeposited Fe NWs took the form Fe 2 O 3  → α-Fe 2 O 3  → Fe 3 O 4 . Transmission electron microscopy images revealed that the surface of Fe@Fe   x −1 O   x    NWs was smooth and orderly, and the oxide layer was dense and uniform. The magnetic analysis of Fe@Fe   x −1  O   x    nanowires was carried out using a vibrating sample magnetometer. It was found that Fe@Fe 3 O 4  nanowires manifested the characteristics of super-paramagnetism in the direction perpendicular to the nanowires due to smaller coercive force, and they can be suitable material for future biomedical applications.

Fabrication of magnetic core–shell Fe nanowires by electrochemical deposition