Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2009-08-03
2010-12-07
McNeil, Jennifer C (Department: 1784)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S831200, C428S828100, C428S832000, C428S800000, C360S125020, CG9BS005104
Reexamination Certificate
active
07846563
ABSTRACT:
A perpendicular magnetic recording system and medium has a multilayered recording layer that includes an exchange-spring structure and a ferromagnetic lateral coupling layer (LCL). The exchange-spring structure is made up of two ferromagnetically exchange-coupled magnetic layers (MAG1and MAG2), each with perpendicular magnetic anisotropy. MAG1and MAG2may have a coupling layer (CL) located between them that permits ferromagnetic exchange coupling of MAG1with MAG2. The LCL is located either above or below MAG1and in direct contact with MAG1and mediates an effective intergranular exchange coupling in MAG1. The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy in MAG1, which typically will include segregants such as oxides. The LCL is preferably free of oxides or other non-metallic segregants, which would tend to reduce intergranular exchange coupling in the LCL. Because the LCL grain boundaries overlay the boundaries of the generally segregated and decoupled grains of MAG1, and the LCL and MAG1grains are strongly coupled perpendicularly, the LCL introduces an effective intergranular exchange coupling in the MAG1.
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Berger Andreas Klaus
Fullerton Eric E.
Lengsfield, III Byron Hassberg
Margulies David Thomas
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
Katz Vera
McNeil Jennifer C
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