Co/Pd1-xMnx multilayers with Mn concentration x=0 to 20.8 % have been sp uttered on a glass substrate with 40 nm thick Pd or PdMn buffer. With the combin ation of small_ and large_angle x_ray analyes, the crystal structure of the samp les were investigated. Hysteresis loop and perpendicular magnetic anisotropy (PM A) were measured by means of an alternating_gradient magnetometer and magnetic t orque. Domain structure was observed by magnetic force microscopy. Saturation ma gnetization, PMA and the Kerr rotation spectrum of the samples were investigated . It is shown that the change of Kerr rotation with the increase of Mn concentr ation in Pd could be ascribed to the variation of diagonal and off_diagonal elem ents of the dielectric tensor.
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