Ultra High Frequency Properties of Periodically Ordered Fe Nanowires

Abstract The periodically ordered Fe nanowires embedded in anodic alumina nanoporous templates have been prepared by electrochemical deposition. The length and diameter of nanowire is 40 μm and 90 nm, respectively. The magnetic anisotropic field is found to be 10,000 Oe. The coercivity (356 Oe) is found much smaller than the theoretical value (10,800 Oe), which is believed due to the ‘nucleation-propagation’ mechanism which has been verified by micromagnetics simulation. The significant reduced remanence manifests the strong magnetic dipolar interaction among plentiful nanowires. The ultra high frequency properties of prepared nanowires array have been measured within 0.5 -12 GHz. Both the experiments and micromagnetics simulation reveal the multiple natural resonances in nanowires array, which is believed due to the inhomogeneous localized magnetic anisotropic field. The inhomogeneous alignment of magnetic moments has been verified by Mossbauer spectra.