Magnetic properties of amorphous Fe89.7P10.3 alloy nanowire arrays

Amorphous Fe89.7P10.3 alloy nanowire arrays were fabricated in an anodic aluminum oxide template by means of electrodeposition. X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mossbauer spectrometer are employed to study the structure and magnetic properties of the nanowire arrays. The results show that the nanowire arrays are amorphous with a perpendicular magnetic anisotropy and high coercivity H-c = 3.04 x 10(4) A/m. The mean hyperfine field and the mean isomer shift of the inside of nanowires are - 2.15 x 10(6) A/m and 0.07 mints, respectively. The mean hyperfine field (2.33 x 10(6) A/m) at the end of nanowires is higher than that of the inside of nanowires, but the mean isomer shift (0.04 mm/s) at the end of nanowires is smaller than that of the inside of nanowires. The average angle between the Fe magentic moment and the wire axis is 16 degrees in the the inside of nanowires, but the average angle is at the end of nanowires. Due to the shape anisotropy of nanowires, the ordered alignment of magnetic moments is realized in the disordered amorphous alloy system.