Abstract
Multilayers composed of Ni/sub 81/Fe/sub 19/ and paramagnetic Co/sub 67/Cr/sub 33/ interlayers were prepared by facing targets sputtering as backlayers for perpendicular magnetic recording media. This multilayered film must satisfy the requirements for both improvement of (111) plane orientation and for providing excellent soft magnetic properties. Co/sub 83/Cr/sub 17/ recording layers deposited onto [Ni/sub 81/Fe/sub 19//Co/sub 67/Cr/sub 33/(50 /spl Aring/)]/sub n/ multilayers exhibited good c-axis orientation as a consequence of lattice matching with the (111) oriented fcc Ni-Fe plane. This effect was further improved by depositing the multilayer on to paramagnetic Co/sub 67/Cr/sub 33/ layers. Soft magnetic properties of Ni-Fe layers were also improved by forming multilayered structure. Ferromagnetic resonance (FMR) studies indicated that there is no significant interdiffusion in the multilayered structure. FMR also suggest that one of the origins of soft magnetism in the multilayers was related to the reduction of inhomogeneity of localized anisotropy. Increased Knoop hardness of the multilayers was also observed using multilayers. >
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