Vertical recording medium with improved perpendicular magnetic a

Details Vertical recording medium with improved perpendicular magnetic a Vertical recording medium with improved perpendicular magnetic a

1985-04-22

1986-12-30

Lesmes, George F.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428660, 428666, 428667, 428668, 428680, 428681, 428694, 428900, 428928, H01F 1030

Patent

active

046328831

ABSTRACT:
A thin film alloy disk for vertical magnetic recording has a cobalt-chromium-tantalum (CoCrTa) magnetic layer with perpendicular magnetic anisotropy deposited on an underlayer of beta-tantalum (.beta.-Ta). The .beta.-Ta layer is deposited on a suitable substrate, such as silicon, which is compatible with the formation of the beta phase of tantalum. The highly preferred orientation of the .beta.-Ta film on the substrate and the incorporation of Ta in the magnetic film results in the magnetic film having improved perpendicular magnetic anisotropy, high perpendicular coercivity and low horizontal coercivity. A nickel-iron (NiFe) layer may be deposited between the substrate and the .beta.-Ta underlayer to provide a magnetic flux return path.

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patent: 4552820 (1985-11-01), Lin et al.
patent: 4576700 (1986-03-01), Kadokura et al.
"High Density Perpendicular Magnetic Recording on Rigid Disks", Fujitsu Sci. Tech. J., 19, 1, pp. 99-126, Mar. 1983.
"Recording on Perpendicular Anisotropy Media With Ring Heads", IEEE Transactions On Magnetics, vol. Mag-17, No. 6, Nov. 1981, pp. 2547-2549.
Tantalum Thin Films, W. D. Westwood, et al., Academic Press (1975), pp. 76-88.
"The Growth Characteristics of Ion-Beam Sputtered CoCr Films on Ta Isolation Layers", IEEE Transactions on Magnetics, vol. Mag-20, No. 5, Sep. 1984.

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