EXPERIMENTAL-VERIFICATION OF A MICROMAGNETIC MODEL OF DUAL-LAYER MAGNETIC-FILMS

A micromagnetic model has been used to characterize the magnetic prope rties of dual-layer magnetic films. The model calculations, with exper imentally determined input parameters, have been compared with measure ments on fabricated Co alloy dual-layer films. Calculations are done w ith a more general version of a previous micromagnetic model, modified to allow the variation of certain media parameters which were previou sly held constant. Each of the experimental media consists of a bilaye r of 30-nm-thick CO0.75Ni0.25 magnetic films separated by a Cr decoupl ing layer. The calculations predict a split in the coercivities of the layers for small Cr thicknesses which is observed experimentally. The model correlates an observed increase in media squareness ratio and c oercivity, as the Cr thickness is increased, with diminishing exchange and magnetostatic interactions between the magnetic layers.