DISCRETE TRACK MEDIA WITH A CAPPED MEDIA STRUCTURE HAVING HIGH MOMENT AND EXCHANGE
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United States of America Patent
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Issued Date -
Jun 18, 2009
app pub date -
Dec 14, 2007
filing date -
Dec 14, 2007
priority date (Note) -
Abandoned
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Abstract
A media architecture is optimized for discrete track recording. A capped or exchange-spring media uses a thin media structure and incorporates higher moment density magnetic layers. A thin exchange coupling layer is used in conjunction with a cap layer to control the reversal mechanism and exchange. Thus, the exchange coupling layer mediates the interaction between the two outer magnetic layers. The thickness of the exchange coupling layer is tuned by monitoring the media signal-to-noise ratio, track width and bit error rate. The recording performance is enhanced by tuning the intergranular exchange in the system through the use of the high-moment cap as writeability, resolution and noise are improved.
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