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A bsrroet-The effects of grain morphology on the magnetic properties and transition noise, and their correlation with magnetic interactions of longitudinal CoCrTaICr thin film media have been studied. An increase of the Cr deposition temperature increases the Cr grain size resulting in a slight increase in the in-plane coercivity, but neither a reduction In magnetic coupling nor an improvement In signal to noise ratio was observed. However, an Increase of the CoCrTa deposition temperature was found to Increase the in-plane coercivity and reduce the transition noise significantly.