Abstract

The thermal activation volume (VA) is studied for CoCrPtTa longitudinal magnetic recording media. VA is found to strongly increase for smaller reversing fields. This trend is also continued in small positive applied fields. The activation area (SA) at the same reversing fields are found to be in reasonable agreement to each other for different media thicknesses. The thinner magnetic films show a larger SA near the coercivity, while δM remanence curves indicate that the intergranular exchange coupling becomes stronger for thinner media. Surprisingly comparable read/write performances are found for different media thicknesses.

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