Abstract

Recording densities in magnetic recording products manufactured today are of the order of 200 Mbit/in. However, it is projected that densities as high as 10 Gbit/in will be achieved in the future. To achieve this, substantial improvements in the thin film magnetic materials used for magnetic heads and media are required.To support higher recording density in thin film media, it is necessary to increase the coercivity, while simultaneously achieving small grain size and small intergranular coupling. To achieve high coercivity, materials with large magnetocrystalline anisotropy are used, while to achieve small, well-isolated grains, special materials are used and deposited under conditions which promote either heavily voided grain boundaries or the segregation of non-magnetic species to the grain boundaries. It is also thought to be important to control the orientation of the crystallites so that a preferred axis of magnetization lies parallel to the direction of recording.

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