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Effects of Alloying and Processing on the Microstructure and Magnetic Properties of CoCr(PtTa) Longitudinal Recording Media

The performance of thin-film Co-Cr based longitudinal recording media is strongly dependent on their nano-scale structure and chemistry [1]. Detailed structural and compositional characterization is required to make structure-property correlations. A critical microstructural feature in sputtered thin films of CoCr(PtTa) is the Cr grain boundary segregation that produces magnetic isolation between grains. The Cr depletion within the grain interiors also influences recording properties such as thermal stability, since saturation magnetization Ms and magnetocrystalline anisotropy Ku are sensitive to local Cr content [2]. This current investigation is a basic study of the influence of alloy composition and processing parameters on the microstructure and resulting magnetic properties of CoCr(PtTa) sputtered longitudinal recording media.