Patent ID: 8070919

Claim:
A method for preparing a one-dimensional spin photonic crystal device having magnetic and nonmagnetic regions, comprising forming magnetic and nonmagnetic regions by the interference of laser beams generated from a femtosecond laser light source, wherein the interference of laser beam is made by splitting a laser beam generated from the femtosecond laser light source into first and second laser beams, followed by incidence of the first and second split laser beams via different paths, wherein a fringe spacing between the magnetic and nonmagnetic regions is adjusted by controlling an intersection angle between the first and second laser beams and wavelengths of the first and second laser beams, wherein the fringe spacing between the magnetic and nonmagnetic regions is tuned according to the following equation 1: a =Î»/(2Ã—sin(Î¸/2))â€ƒâ€ƒ(Equation 1) wherein a represents a fringe spacing between the magnetic and nonmagnetic regions, Î» represents a laser beam wavelength, and Î¸ represents the intersection angle between the first and second laser beams wherein the spin photonic crystal device comprises a substrate and a thin film deposited on the substrate, and wherein the thin film is deposited by magnetron sputtering, and wherein the thin film includes a composition of Co 2 MnSi.