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comprehensive sNdy of the magnetic pmperries of nonheracting single-domain panicles with cubic magnetocrystalline anisotropy h presented. k numerical calwlations extend the m-temperature predictions of Joffe and Heuberger and enable the e t k n of thermally activaled magnetizalion revenal on the hysteresis loop at finite temperahlm to be determined. Variations in particle s i u distribution are also considered. Calculations indicale a reduction in the intrinsic coercivity as the mean particle diameter is reduced and an i n m e in coercivity for small particle diameter systems as the standard deviation of the size distribution is increased.

The nature of media recording noise in metallic, quasiparticulate thin films is principally related to the grain size, crystallographic orientation, and intergranular exchange and magnetostatic coupling in the films. In this study the results of a magnetic evaluation of magnetostatic interactions in CoNiCr thin films of varying Cr underlayer thickness are reported. The evaluation is undertaken through the measurement and comparison of remanence curves. The results presented here indicate enhanced cooperative switching as Cr underlayer thickness is reduced from 2000 to 100 Å, with a strong correlation between signal-to-noise measurements. In addition, the transition from principally exchange-coupled to quasiparticulate thin films, as Cr underlayer thickness increases, has been established.<lz> <lz> <lz> <lz> <lz> <lz>

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Abrtmct -In thh papa the effects of different demagnetisation procasu on intaactionr in thin fikn media have been examined.InterrCtion &ectr are examined using the now well established 6 1 tachnique. Tht study giver a better understanding to the nature of intaactionr in thin film media and in particular the effect of the initial magnetic state on the 61 technique.