Amorphous Fe89.7P10.3 alloy nanowire arrays were fabri cated in an anodic aluminum oxide template by means of electrodeposition. X-ray diffract ion, transmission electron microscopy, vibrating sample magnetometer and Mssbauer 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 Hc=304 ×104 A/m. The mean hyperfine field and the mean isomer shift of the insi de of nanowires are 215×106 A/m and 007 mm/s, respectively. The mean hype rfine field (233×106 A/m) at the end of nanowires is higher than that of th e inside of nanowires, but the mean isomer shift (004 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° in the the inside of nanowires, but the average angle is 28° 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.
Based on the symmetric fanning mechanism of the sphere-chain model,a systematic study on the hysteresis loops for hexagonal arrays of segmented composite magnetic nanowires fabricated by electrochemical deposition is performed by taking into account the interfacial exchange coupling effect between the segments. The coercivity variation rule with the change of the segments is presented. It is found that the exchange coupling effect between the segments plays an important role for magnetization reversal in the segmented composite nanowire arrays.
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