Fabrication, structural and magnetic properties of electrodeposited Fe80Pt20 nanowires and nanotubes

Summary form only given. Magnetic nanostructures have attracted a great deal of attention during the last decade because of their prospective applications not only in microwave absorption, high density recording media, and biosensor applications but also in functional micro and nanodevices. Recently, significant investigations have been motivated to get excess of 1Tbit/in² in magnetic storage devices but at smaller bit size superparamagnetic limit arises. The process of DC electrodeposition has been employed to synthesize highly ordered Fe₈₀Pt₂₀ nanowires (NWs) and nanotubes (NTs) in anodic aluminum oxide (AAO) templates with average pore diameter of about 200 nm. The structural and magnetic properties of nanostructures has been investigated before and after simple and magnetic field annealing. A significant influence of magnetic field annealing with field strength of 1 T has been observed in the direction parallel and perpendicular to NWs and NTs axis respectively. X-Ray Diffraction analysis showed face centered cubic (fcc) as the dominant phase for Fe₈₀Pt₂₀ NWs and post annealing led to better crystallinity with retained fcc phase. On the other hand, Fe₈₀Pt₂₀ NTs shows amorphous behavior before and after simple and magnetic field annealing. Furthermore, magnetic properties, including saturation magnetization (Ms), squareness (Mr/Ms), and coercivity (Hc), have been investigated as a function of annealing temperature by Vibrating Sample Magnetometer. In conclusion, behavior of coercivity (Hc) was based on prolate ellipsoid chain model. Microstructural and magnetic properties strongly correlate with each other.