Perpendicular magnetic recording medium with...

Details Perpendicular magnetic recording medium with... Perpendicular magnetic recording medium with...

2007-04-16

2009-12-29

Bernatz, Kevin M (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S828100, C428S829000, C428S212000, C360S135000

Reexamination Certificate

active

07638210

ABSTRACT:
A perpendicular magnetic recording medium has an “exchange-spring” type magnetic recording layer (RL) with an improved coupling layer (CL). The RL includes the first or lower ferromagnetic layer MAG1, sometimes called the “media” layer, the second or upper ferromagnetic layer MAG2, sometimes called the “exchange-spring” layer, and the intermediate CL that provides ferromagnetic exchange coupling between MAG1and MAG2. The CL is formed of NiCr or RuCr based alloys, or CoCr or CoCrB alloys with high Cr and/or B content (Cr plus B>about 25 atomic percent), or RuCoCr alloys with low Co content (<about 65 atomic percent). For each CL composition there is a CL thickness range that provides the optimal interlayer exchange coupling between MAG1and MAG2. The selected CL materials provide an exchange-type perpendicular magnetic recording medium with good magnetic performance, while the relatively high amount of Cr of the CL improves the corrosion resistance of the medium.

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