Controllable growth and magnetic characterization of electrodeposited nanocrystalline Ni–P alloy nanotube and nanowire arrays inside AAO template

Magnetization reversal and magnetic anisotropy in ordered CoNiP nanowire arrays: effects of wire diameter

Ordered CoNiP nanowires with the same length of 4 µm and varying diameters (d = 100 nm–600 nm) were fabricated by electrodeposition of CoNiP onto polycarbonate templates. X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy confirmed the quality of the fabricated nanowires. Magnetic measurements and theoretical analysis revealed that the magnetization reversal and magnetic anisotropy were significantly influenced by varying of the diameters of the nanowires. There existed a critical wire diameter (d_c ≈ 276 nm), below which the magnetization reversal occurred via a coherent rotation mode, and above which the magnetization reversal occurred via a curling rotation mode. The easy axis of the magnetization tended to change in direction from parallel to perpendicular with respect to the wire axis as the wire diameter exceeded d_c ≈ 276 nm. With increasing wire diameter, the coercive field (H_c) and the remanent to saturation magnetization ratio (M_r/M_s) were also found to rapidly decrease in the range d = 100–400 nm and gradually decrease for d > 400 nm.

Vertical arrays of anisotropic particles by gravity-driven self-assembly

Anisotropic particles assemble to spontaneously form columnar arrays. Hybrid nanotube/nanowire particles (silica nanotubes partially filled with metallic cores) deposit with their denser metallic ends towards the surface, orienting them vertically. Up to 84% are observed to be standing over a 0.64 cm(2) area within 15 min. Standing percentage is found to be dependent on particle surface concentration.