Abstract
The spatial distribution of coercivities in a CoCrPt-SiO2 granular perpendicular magnetic recording medium was measured by using in situ magnetic force microscopy. The coercivity map that shows the spatial distribution of coercivities was obtained at 1kOe intervals in the medium. The “local” coercivities within microscopic areas of less than 100nm square were evaluated with a good reproducibility. Measuring coercivity map will become a technique for investigating the influence of the spatial distribution of coercivities on the medium noise in perpendicular recording.
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