Enhance in the magneto-optical properties of magnetic grating

The magneto-optical properties of one-dimensional magnetic grating structure of Co$_{2}$MnSi film were investigated. By using the interference pattern of two femtosecond-laser beams, a selective-area annealing of the as-deposited Co$_{2}$MnSi film was performed and one-dimensional magnetic grating structures were fabricated. The atomic-force-microscopy image showed regularly-spaced alternating lines with a periodicity of 2\textit{ $\mu $}m. The corresponding magnetic-force-microscopy image also revealed periodic patterns of two different magnetic states in the sample. The longitudinal Kerr rotations of the zeroth- and the first-order diffracted beams were measured. The longitudinal Kerr rotation of the first-order diffracted beam is nearly 18 times larger than that of the zeroth-order beam.