Magnetic properties and crystalline structures of Fe21Ni79 nanowire arrays

Fe21Ni79 nanowire arrays have been fabricated by the electroforming method using AAO (anodic aluminum oxide) as a template, which was prepared by anodizing the pure aluminum foil. According to the magnetic property of Fe21Ni79 nanowire prepared, it was found to have the coercivity more than 1 kOe due to the shape anisotropy and squareness (Mr/Ms) very close to 1. Especially, it could be noted that Fe21Ni79 nanowire showed the preferred crystallographic orientation of (220). Annealing treatment of Fe21Ni79 nanowire at 500 degree C resulted in the enhancement of coercivity by 18% while the squareness was not varied by annealing treatment. However, the random orientation of Fe21Ni79 disk and the preferred orientation of nanowire arrays were maintained without respect to the annealing treatment up to 500 degree C