Abstract
Co-based alloys have been successfully used as sputtered thin film media for hard disk drives. Media with higher recording density and lower media noise are required for the future hard disk drives. The magnetic properties can be controlled by processing and alloy composition. However, the origin of the magnetic properties, such as film coercivity and transition noise, are not fully understood yet. In this paper the analysis of the magnetic properties versus microstructure of Co-based alloy single and multilayer media is reported.Co-alloy media were prepared by DC magnetron sputtering of Cr, Co-alloy (CoCrNi and CoCrPt) and overcoat materials(C and Zr) on Ultra Densified Amorphous Carbon (UDAC) substrates. The sputtering pressure and deposition temperature were 3-5 mTorr and between 30°C and 300°C, respectively.The coercivity of CoCrNi and CoCrPt media increases with the deposition temperature in the range between room temperature and a few hundred degree Celsius. Figure 1 shows cross-section TEM(XTEM) images of CoCrPt media.
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