Magnetic recording medium and magnetic recording apparatus

Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media

Reexamination Certificate

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Reexamination Certificate

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07005202

ABSTRACT:
The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

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L. Lee et al, NiAl Underlayers for CoCrTa Magnetic Thin Films, IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994, pp. 3951-3953.
L. Lee et al, “MgO Seed Layers for CoCrPt/Cr Longitudinal Magnetic Recordin Media”, Applied Physics Letters, vol. 67, No. 24, Dec. 1995, pp. 3638-3640.

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