Electrochemical synthesis and magnetic characterization of periodically modulated Co nanowires.

The synthesis of templates with modulated pore channels by combined mild and hard anodization processes is described. The hard anodization pulses, implemented during anodization, are controlled not only in time length and amplitude, but also in shape: square and exponential signals have been applied. Electrodeposition of Co is subsequently performed to obtain uniform and modulated diameter nanowire arrays.

Continuous and nanostructured TiO2 films grown by dc sputtering magnetron.

The growth of Anatase nanostructured films using dc reactive magnetron sputtering and post-annealing treatment is reported. TiO2 has been deposited on Porous Anodic Alumina Films used as templates which were previously grown in phosphoric acid solution and etched to modify their pore diameters. This synthesis via results in the formation of vertically aligned and spatially ordered TiO2 nanostructures replicating the underlying template.

Preparation and magnetic properties of cylindrical NiFe films and antidot arrays.

Continuous NiFe (Permalloy) cylindrical films and arrays of cylindrical NiFe antidots 7 nm thick have been prepared by sputtering onto cylindrical aluminum wires and onto wires anodized to form a porous anodic alumina layer. The antidots are arranged in a close-packed pattern determined by the hexagonal pore arrangement in the porous alumina, with period 103 nm and diameter 42 nm. Hysteresis loops were measured at different angles with respect to the cylinder axis and indicate an easy plane normal to the radius of the wire.

Patterning of rutile TiO2 surface by ion beam lithography through full-solid masks.

In this work we present and discuss the nanopatterning of rutile TiO(2) single crystal surfaces following their irradiation with energetic heavy ions through a stencil mask of Ni filled self-ordered porous anodic alumina. After etching in HF a corrugated surface morphology is obtained composed of parallel alternate furrows and ridges (or nanobars) 50 nm in diameter and with 100 nm pitch. In addition, isolated, but collapsed, TiO(2) nanorods are seen lying on the patterned surface.

Ordered arrays of magnetic polymer-based nanorods by template synthesis.

An ordered array of polymer-based magnetic nanorods has been prepared from poly(vinyl alcohol) solution with dispersed CoFe2O4 nanoparticles by template synthesis using nanoporous anodic alumina. The ordering of the alumina template is transferred to the magnetic nanocomposite in such a way that the magnetic nanorods are located in an orderly fashion. The organic-inorganic nature of the nanorods is proven and their first magnetic characterization reveals a little magnetic anisotropy.