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| Achieving progressively higher areal densities
involves new media materials and structures. Below 40 Gbits/in2
conventional longitudinal media appeared adequate for efficient
magnetic recording, above this, AFC effectively minimized thermal
stability influences based on superparamagnetism. The future
may require an entirely new recording mode, perpendicular recording
which involves changes in both head and media technologies.
The far future may involve a radically different approach to
disk media design, patterned media. In this technique the media
is preprocessed to define a bit pattern on the disk surface
which will determine areal density. This bit pattern consists
of islands of magnetic material surrounded by a non magnetic
matrix, resulting in a significant reduction in the demagnetizing
fields within the bit pattern. |
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