Structure and magnetic properties of [FePt／Ag]10 multilayer films

FePt/Ag]10 multilayers were deposited on glass substrates by magnetron sputtering. After being annealed at 550℃ for 30 rain, the coercivities of FePt/Ag]10 multilayer films were observably improved. Magnetic properties ofFePt/Ag]10 multilayer films are influenced by the Ag content. The highest coercivity is obtained for those multilayer films that the Ag content is about 25%. The analysis for the remanence curves shows that the lower FePt layer thickness is favorable for decreasing the intergranular interaction. Result of XRD shows that a thick Ag layer can enhance the intensity of FePt(001) peak. A magnetic activation volume of the order of 10^-24 m^3 is obtained by the measurement of magnetic viscosity, showing that it is promising to be ultrahigh density recording media.