Temperature dependent structural and magnetic properties of permalloy (Ni80Fe20) nanotubes.

• Permalloy (Ni 80 Fe 20) nanotubes (NTs) are fabricated using Anodic Aluminum Oxide (AAO) templates by using dc electrodeposition method. • Ni 80 Fe 20 grows in FCC crystal structures and which is clearly polycrystalline nature. • Magnetic properties of Ni 80 Fe 20 NTs are strongly influenced by annealing temperature. • H C Vs θ and SQ Vs θ with bell shape behavior verifies the easy axis of magnetization along the direction perpendicular long axis of tube. • After annealing, the increase in H C can be explained based on the Prolate ellipsoid chains model. One dimensional Permalloy (Ni 80 Fe 20) nanotubes (NTs) were successfully fabricated using Anodic Aluminum Oxide (AAO) templates with 100 nm diameter by employing a low-cost electrodeposition route at room temperature. As prepared Ni 80 Fe 20 NTs morphology, elemental analysis and structural details have been investigated by using field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS) and X-Ray diffraction (XRD) respectively. The structure of prepared Permalloy nanostructures has face centered cubic (FCC) phase with polycrystalline in nature. The Ni 80 Fe 20 NTs were annealed at 200 °C, 400 °C and 600 °C. The vibrating sample magnetometer (VSM) measurements showed that all the samples exhibit ferromagnetic nature. Furthermore, VSM has been employed to study the saturation magnetization (M S), Squareness (SQ) and Coercivity (H C) as the function of annealing temperature. A comparative study of magnetization reversal mechanism has also been conducted. The easy axis lies in the direction perpendicular to the NTS axis due to the dominance in shape anisotropy. Annealing temperature improved the magnetic properties of Permalloy (PA) NTs. This work will provide significant applications in the field of spintronics and high-density data storage devices. [ABSTRACT FROM AUTHOR]