Pseudo-monocrystalline properties of cylindrical nanowires confinedly grown by electrodeposition in nanoporous alumina templates

Four different cylindrical nanowires systems with single-crystal-like properties have been characterized by transmission electron microscopy and selected area electron diffraction (SAED) under different tilting angles.

Comparison of high pressure and nanoscale confinement effects on crystallization of the molecular glass-forming liquid, dimethyl phthalate

We have systematically investigated the crystallization and melting behavior of a molecular liquid under high-pressure and geometrical confinement provided by nanoporous alumina templates of different pore sizes.

Magnetic Behavior of Single Ni Nanowires and its Arrays Embedded in Highly Ordered Nanoporous Alumina Templates

We report on magnetization reversal and geometry dependent magnetic anisotropy of Ni nanowire arrays electrodeposited in nanoporous alumina templates. Using micromagnetic simulation we have found that magnetization reversal mechanism in arrays with different nanowire diameters is curling. This magnetic behavior appears with propagation of the domain wall along a nanowire. The calculations have been proven by the analysis of hysteresis curves. To explain magnetic properties of closely-spaced nanowire arrays we have taken into consideration the magnetostatic interaction between adjacent nanowires and their structural defects, like as boundary grains. The investigated magnetic domain pattern of individual bended nanowires confirms rather complicated magnetization reversal mechanism than either coherent rotation of magnetization or its curling. Competition between the shape and magnetoelastic anisotropies can induce an unusual zigzag-like domain pattern in a single nanowire.

Effect of Barrier Layer on Fabrication of FePt Nanowires by Electrodeposition into Nanoporous Alumina Templates

It is well known that the nanoporous aluminum oxide film is an electrical insulator. In addition the homogeneity of electrodeposited nanowire arrays in nanoporous alumina templates increases drastically with the usage of AC electrodeposition in comparison to DC electrodeposition. This is revealing of the effect of dielectric properties of alumina that is used as template for electrodeposition. In this work integrated nanowire arrays of FePt alloys were successfully fabricated by alternating current electrodeposition on nanoporous alumina; also we characterize the nanoporous alumina membrane that is used as a template for FePt nanowire electrodeposition using EIS allowing the electrochemical impedance contributions from the barrier layer, nanoporous structure, and electrolyte solution resistance to be calculated through the use of an equivalent circuit model. The impedance spectra of the porous film prepared under different anodization conditions were measured. The data is attained at open circuit potential over a frequency range between 1 Hz to 100 KHz with an AC potential amplitude of 10 mV. As our result demonstrates the resistance of the bariyer layer decreases with the anodization temperature then the electrochemical process of FePt nanowires at template which fabricated on low anodization temperature will be difficult due to the higher resistance.