Abstract
A medium formation technique for controling Cr segregation at the grain boundaries of CoCrPt thin magnetic film without significant change of the grain size and Hk value has been developed, whereby the effect of magnetic coupling between grains on noise in thin metallic longitudinal media can be investigated simply. In this technique, a Cr film and a CoCrPt film are successively deposited and subsequently annealed. This annealing creates the Cr diffusion from both the underlayer and magnetic grains for the segregation. The Cr segregation can be controled by the annealing time. It has been found that the increase of annealing time causes the decrease of magnetic coupling between grains in magnetic thin film. The decrease of magnetic coupling results in decrease of media noise without decrease of the grain size, Hk value, and output signal.
