Tuning the magnetic properties of high aligned strontium ferrite nanowires formed in alumina template

Ordered hexagonal array of strontium ferrite nanowires were fabricated by dip coating in alumina templates and the influence of diameter and length on the magnetic properties of high aligned nanowire arrays were studied. The diameter of nanowires, synthesized in high aspect ratios, was changed from 30 to 60 nm while maintaining the same center to center distance between them. The samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray spectrum (EDS). Magnetic properties of nanowires were measured by a SQUID; the hysteresis loops were obtained with the applied magnetic field parallel and perpendicular to the wire axis. Magnetic properties of nanowire arrays were also investigated as a function of temperature. The Results showed that both coercivity and squareness increased with increasing wire length, while for constant center-to-center distance, coercivity decreased with increasing the diameter. Parallel anisotropy was achieved for 30 +/- 4 nm diameter nanowire array having 15 +/- 0.01 mu m length. A curling mode of magnetization was suggested in strontium nanowires. (C) 2015 Elsevier B.V. All rights reserved.