Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-07-24
2007-07-24
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S831000, C428S656000, C428S661000, C428S664000, C428S669000, C428S670000, C428S671000, C428S672000, C428S673000, C428S674000, C428S675000, C428S676000, C428S212000, C428S336000
Reexamination Certificate
active
10764602
ABSTRACT:
A perpendicular magnetic recording medium including an interlayer structure for crystallographically orienting a layer of a hexagonal close-packed (hcp) perpendicular magnetic recording material formed thereon, comprising in overlying sequence from a surface of a magnetically soft underlayer:(1) a first crystalline layer of a material having a first lattice parameter and a strong preferred growth orientation;(2) a second crystalline layer of a material having a second lattice parameter and the same strong preferred growth orientation as the first crystalline layer; and(3) a third crystalline layer of an hcp material, having a [0002] lattice parameter similar to or different from that of the second lattice parameter of the second crystalline layer and a strong <0002> preferred growth orientation, wherein:the second crystalline layer has a lower interfacial energy with the first crystalline layer and a higher interfacial energy with the third crystalline layer, owing to a lower surface energy of the first crystalline layer and a higher surface energy of the second crystalline layer.
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Chang Chunghee
Chen Qixu
Girt Erol
Lee Li-Lien
Nolan Thomas Patrick
Bernatz Kevin M.
McDermott Will & Emery LLP
Seagate Technology LLC
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