Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-10-24
2006-10-24
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
07125616
ABSTRACT:
A magnetic recording disk has an antiferromagnetically-coupled (AFC) structure that has three lower ferromagnetic layers (LL1, LL2, LL3) and an upper ferromagnetic layer (UL), all four ferromagnetic layers being antiferromagnetically-coupled together across corresponding antiferromagnetically-coupling layers. The UL has a magnetization-remanence-thickness product (Mrt) greater than the Mrt each of the three lower layers LL1, LL2, LL3, and greater than the sum of the Mrt values of LL1and LL3. The middle lower layer LL2has an Mrt less than the Mrt of each of the other lower layers LL1and LL3, and as a result the composite Mrt of the AFC structure is less than the composite Mrt of a conventional AFC structure having only a single lower layer. The AFC structure achieves this composite Mrt reduction without increasing the Mrt of any of the three lower layers above the maximum Mrt of the single lower layer in the conventional AFC structure.
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Do Hoa Van
Fullerton Eric Edward
Margulies David
Moser Andreas
Bernatz Kevin M.
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
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