Abstract: A method for preparing a film of aligned rod-like nanostructures or nanotubes comprises preparing a solution that comprises rod-like nanostructures or nanotubes, wherein the rod-like nanostructures or the nanotubes are well-dispersed, and performing vacuum filtration of the solution through a filtration membrane, wherein the vacuum filtration produces a film on the filtration membrane where the rod-like nanostructures or the nanotubes are aligned. The well-dispersed individual rod-like nanostructures or nanotubes may be separately suspended in the solution. The concentration of rod-like nanostructures or nanotubes may be below a threshold value and/or the filtration speed may be as slow as possible. Where a surfactant is utilized to aid dispersion, the surfactant concentration may be below a critical micelle concentration (CMC).

Abstract: A ferromagnetic III-V semiconductor material and method for nonthermally recording information on the same. In one embodiment, the method comprises providing a ferromagnetic III-V semiconductor material, wherein the semiconductor material comprises at least one Group III element, at least one Group V element, and a dopant. In addition, the method comprises exposing the ferromagnetic material to laser pulses to produce transient carriers. Further embodiments include the dopant comprising manganese.