THERMAL EFFECTS IN HIGHLY PACKED RECORDING MEDIA

The dependence of coercivity on packing density in media composed of a cicular particles is discussed. We conclude that the nonlinear depende nce at small and the linear dependence at moderate packing densities i s due to dipolar interactions between the particles; at higher packing densities the bulk magnetization reversal mechanism sets in. It is sh own that both the range of linear packing density dependence and the t ransition to the bulk mode are determined by ambient temperature and d riving held frequency. (C) 1998 Elsevier Science B.V. All rights reser ved.