Change of magnetic anisotropy from in-plane to perpendicular state was observed in Co films after laser pulse annealing. High power laser pulses generated by the Chameleon Ultra Coherent laser were focused with a lens of 20 mm focal length on the epitaxial Au/Co/Au sandwich prepared by magnetron sputtering. The laser pulses are of 700 nm wavelength, 200 fs width, the repetition rate is 80 MHz, and average power 2W. Magnetic properties of irradiated samples are characterized by magneto-optic Kerr microscopy, magnetic force microscopy (MFM) and magneto-optic vector magnetometry. Irradiation effect is studied as function of Co thickness, laser power and exposition time. Perpendicular magnetization states were obtained for Co films thicker that corresponding spin reorientation transition (SRT) thickness of non-irradiated one.

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