Abstract
This paper presents measured surface texture parameter values critical for evaluating the mechanical reliability of the head-disk interface in perpendicular magnetic recording with a small clearance of less than 1 nm. It was found that mean asperity height is ∼0.5 nm and asperity density is ∼5000 μm−2. The asperity radius of curvature has an anisotropic nature but its averaged value is ∼20 nm. The radius of highest asperity group related to asperity contact appears to be close to ∼10 nm.
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