Magnetic and Distribution of Magnetic Moments in Amorphous Fe_89.7P_10.3 Alloy Nanowire Arrays

Binary amorphous Fe_89.7P_10.3 alloy nanowire arrays in diameter of about 40nm and length of about 3μm have been fabricated in an anodic aluminium oxide template by electrodeposition. Magnetic properties of the samples are
investigated by mean of vibrating sample magnetometer, transmission
Mossbauer spectroscopy and conversion electron Mossbauer spectroscopy at room temperature. It is found that the nanowire arrays have obvious perpendicular magnetic anisotropy, and are ferromagnetic at room temperature, with its Mossbauer spectra consisting of six broad lines. The average angles between the Fe magnetic moment and the wire axis are about 14° inside and 28° at the end of the amorphous Fe_89.7P_10.3 alloy
nanowire arrays, respectively. The magnetic behaviour is decided by the shape anisotropy and the dipolar interaction between wires. In addition, the magnetic moments distribution is theoretically demonstrated by using the symmetric fanning mechanism of the spheres chain model.