Abstract
Highly ordered arrays of Ni nanowires (NWs) and nanotubes (NTs) were electrodeposited into porous anodic alumina templates with 200 nm pore diameter. The geometrical parameters of the NW/NT arrays were tuned by the deposition conditions. The fabricated NWs and NTs had various lengths depending upon deposition time and NTs had a wall thickness of ~40 nm. Morphological characterizations were performed using a scanning electron microscope and transmission electron microscope yields the topology of NWs and NTs, structural properties were determined using X-ray diffraction, and magnetic characterization was done using SQUID. Dynamic properties have been studied by ferromagnetic resonance technique in frequency sweep mode. A comparative study of the magnetization reversal processes was also performed by analyzing the angular variation of resonance frequency of NWs/NTs. The resonance frequency increases linearly with magnetic field for studied arrays. In NWs the magnetization reversal mode is curling mode, whereas for NTs it is coherent rotation mode.
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