Abstract
The microstructural and magnetic properties of CoNiPt alloy films :with SiO2 added were studied to determine the films' potential for use in high-density longitudinal recording media. The Si in the sputtered film is in the form of SiO2 and is segregated at the grain-boundary. With the addition of the SiO2, the grain size becomes smaller and grain separation becomes well developed. These changes in the grain structure are attributed to the presence of segregated SiO2.The in-plane coercivity increases and media noise decreases significantly with an increase of SiO2, while the crystal orientation dose not change. A magnetic ripple structure indicating the clustering of exchange-coupled grains fades out with the addition of the SiO2. Thus, the well-developed grain separation due to the addition of SiO2 is responsible for the excellent magnetic properties, which are suitable for high-density recording media.
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