Study On The Magnetic Properties Of Nanowire Arrays Prepared By Template Synthesis Method

FeSb,CoSIb,FePd nanowire arrays were prepared by the electrodeposition method and their physical properties were investigated.A unique method by which single crystalline Fe₂Sb₃ nanowires orientated along [201] can be fabricated has been developed. And Fe₂Sb₃ is new intermetallic compound with teteragonal structure. Using normal electrodeposition, Fe₃Sb₂ orientated along [102] and complexes Fe₂Sb₃ nanowire arrays have been prepared in anodic aluminum oxide templates. Magnetic measurement indicated that the nanowire arrays orientated along [201] and [102] both have perpendicular magnetic anisotropy .Fe_100-xPd_x nanowire arrays with the different composition have been fabricated in anodic aluminum oxide templates by electrodeposition method. Around x = 30, the nanowire arrays still show rather high coercivity and the axial anisotropy. But increase the Pd content to x = 50, the magnetization easy axis is toned to perpendicular to the nanowires. It has been attributed to the discontiguous magnetic layer separated by the non-ferromagnetic sheets grown in the Fe₅₀Pd₅₀ nanowires. The formation of the layer-shaped structure in Fe₅₀Pd₅₀ nanowires has been discussed based on the growth kinetics.At same depositing potentials, two different-orientated Co₈₀Sb₂₀ nanowires have prepared by applying the various depositing currents. The nanowires fabricated at high depositing currents were amorphous and nanocrystalline alloy materials, and the other fabricated at low depositing currents orientated along [002]. Magnetic measurement indicated both nanowires have perpendicular magnetic anisotropy and the nanowires orientated along [002] still have high coercivity at room tempreture.Other alloy system, two different-orientated CoSb3 nanowires, including orientated along [420] and [510], were synthesized by electrodeposition. The morphologies, structure, and composition of the as-synthesized samples have been performed using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDS). The formation of different perferred orientation CoSb3 nanowires has been discussed.