Multilayer perpendicular media with high-boron or...

Details Multilayer perpendicular media with high-boron or... Multilayer perpendicular media with high-boron or...

2008-01-29

2008-01-29

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S832100, C428S834000, C428S836100

Reexamination Certificate

active

07323259

ABSTRACT:
Carbon or boron is added into the CoCr layers of a multiplayer perpendicular magnetic media structure to reduce media noise. The perpendicular magnetic media structure has sharp interfaces between Co-alloy layers and Pd or Pt layers and significantly reduced exchange coupling. In accordance with one embodiment of the invention, the perpendicular magnetic media structure with carbon or boron additives is 700 Å FeCo30.8B12/20 Å TaOx/700 Å FeCo30.8B12/20 Å TaOx/700 Å FeCo30.8B12/20 Å TaOx/158 Å FeCo30.8B12/17 Å Ta/49 Å ITO/33 Å CoCr37Ru10/2.5 Å COy/2.5 Å C/[(CoCr9)C6.8/Pd]19/50 Å CHN. [(CoCr9)C6.8/Pd]19means 19 layers of the bi-layer stack (CoCr9)C6.8/Pd. TaOxstands for surface-oxidized Ta and COystands for C oxides. ITO stands for Indium Tin Oxide and consists of In2O3and Sn2O5at 80 and 20 molecular percent respectively. CHN refers to hydrogenated and nitrogenated carbon.

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Y. Kubota et al.: “Development of CoX/Pd Multilayer Perpendicular Magnetic Recording Media With Granular Seed Layers” Journal of Magnetism and Magnetic Materials., vol. 242-245, Apr. 2002, pp. 297-303, XP004358683 Elsevier Science Publishers, Amsterdam, NL ISSN: 0304-8853.

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