Magnetic moment orientations in alpha-Fenanowire arrays embedded in anodic aluminum oxide templates

Abstract

Magnetic moment orientations of α-Fenanowire arrays with two different diameters have been investigated bymeans of transmission Mössbauer spectroscopy (MS) and conversionelectron Mössbauer spectroscopy (CEMS). From the intensity ratioin the sextets of MS and CEMS, it is found that inside the α-Fenanowire array (60 nm in diameter) the magnetic moments are well parallel to thenanowires, but near the extremities of the nanowires the magnetic moment orientationdeviates from parallelism to the long axis of the wire. When the diameter of the α-Fenanowires increases (300 nm in diameter), CEM spectra indicate that the meanangle of orientation between the moment direction and the long axis of the wirebecomes larger near the extremities of the nanowires. The calculatedconfigurations of magnetic moment orientations are consistent with the MS andCEMS measurements.