Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1991-10-21
1992-10-06
Thibodeau, Paul J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428694, 428900, 428928, 428678, 428680, 427129, 427131, 2041922, G11B 500
Patent
active
051530449
ABSTRACT:
A method for manufacturing a disk includes the step of forming a first nickel-phosphorus alloy layer on an aluminum substrate, e.g., by electroless plating. A second nickel-phosphorus layer is then sputtered onto the first nickel-phosphorus layer, and a magnetic alloy is sputtered onto the second nickel-phosphorus layer. The magnetic alloy is typically sputtered immediately after the second nickel-phosphorus layer is formed without removing the disk from the sputtering apparatus between the time the second nickel-phosphorus layer is formed and the time the magnetic alloy is formed. Because of this, contaminants are not capable of lodging on or affecting the surface of the disk prior to formation of the magnetic alloy. The second nickel-phosphorus layer is typically amorphous and therefore masks any nonuniformities in the surface of the first nickel-phosphorus layer. Because of this, the second nickel-phosphorus layer serves as a uniform nucleation surface for forming the magnetic alloy, and thus the magnetic alloy exhibits uniform magnetic characteristics.
REFERENCES:
patent: 3520664 (1970-07-01), York
patent: 3832168 (1974-08-01), Gulla
patent: 4079169 (1978-03-01), Nigh et al.
patent: 4210946 (1980-07-01), Iwasaki et al.
patent: 4224381 (1980-09-01), Patel et al.
patent: 4371590 (1983-02-01), Izumi et al.
patent: 4514451 (1985-04-01), Suzuki et al.
patent: 4520076 (1985-05-01), Saito et al.
patent: 4552820 (1985-11-01), Lin et al.
patent: 4576700 (1986-03-01), Kadokura et al.
patent: 4576876 (1986-03-01), Shiiki et al.
patent: 4610911 (1986-09-01), Opfer et al.
patent: 4622273 (1986-11-01), Nakashima et al.
patent: 4629660 (1986-12-01), Sagoi et al.
patent: 4735853 (1988-04-01), Okudaira et al.
patent: 4759996 (1988-07-01), Ogawa et al.
patent: 4789598 (1988-12-01), Howard et al.
Jian-Gang Zhu and H. Neal Bertram, "Recording and Transition Noise Simulations in Thin Film Media," IEEE Transactions on Magnetics, vol. 24, No. 6, Nov. 1988, pp. 2706-2708.
S. Iwasaki et al., "Perpendicular Magnetic Recording with a Composite Anisotropy Film," IEEE Transactions on Magnetics, vol. MAG-15, No. 6, Nov. 1979, pp. 1456-1458.
M. Futamoto et al., "Microstructure and Magnetic Properties of CoCr Thin Films Formed on Ge Layer," IEEE Transactions on Magnetics, vol. MAG-21, No. 5, Sep. 1985, pp. 1426-1428.
R. Ranjan et al., "Effect of Ferromagentic NiP on the Properties of Longitudinal Recording Media," Journal of Magnetism and Magnetic Materials 79 (1989) pp. 242-248, North-Holland, Amsterdam.
Tu Chen et al., "Physical Origin of Limits in the Performance of Thin-Film Longitudinal Recording Media," IEEE Transactions on Magnetics, vol. 24, No. 6, 1988, pp. 2700-2705.
H. S. Gill et al, "The Growth Characteristics of Ion-Beam Sputtered CoCr Films on Ta Isolation Layers," IEEE Transactions on Magnetics, vol. MAG-20, No. 5, Sep. 1, pp. 776-778.
R. Sugita et al., "Co-Cr Perpendicular Recording Medium by Vacuum Deposition," IEEE Transactions on Magnetics, vol. MAG-17, No. 6, Nov. 19, pp. 3172-3174.
Howard, "Thin Films for Magnetic Recording Technology: A Review", Journal of Vacuum Science & Technology, Jan. 1985, pp. 1-13.
Potter, "Analysis of Saturation Magnetic Recording Based on Arctangent Magnetization Transitions", Journal of Applied Physics, vol. 41, No. 4, Mar. 15, 1970, pp. 1647-1651.
Opfer et al., "Thin-Film Memory Disc Develoment", Hewlett-Packard Journal, Nov. 1985, pp. 4-10.
Chen, "The Micromagnetic Properties of High-Coercivity Metallic Thin Films and Their Effects on the Limit of Packing Density in Digital Recording", IEEE Transactions on Magnetics, vol. MAG-17, No. 2, Mar. 1981, pp. 1181-1191.
Daval et al, "Electron Microscopy on High-Coercive-Force Co-Cr Composite Films", IEEE Transactions on Magnetics, vol. MAG-6, No. 4, Dec. 1970, pp. 768-773.
Dressler et al., "A Study of Digitally Recorded Transitions in Thin Magnetic Fields", IEEE Transactions on Magnetics, vol. MAG-10, 1974, pp. 674-677.
Curland et al., "Transition Region in Recorded Magnetization Patterns", Journal of Applied Physcis, vol. 41, No. 3, Mar. 1, 1979, pp. 1099-1101.
Bonyhard et al., "A Theory of Digital Magnetic Recording on Metallic Films", IEEE Transactions of Magnetics, vol. MAG-2, No. 1, Mar., 1966, pp. 1-5.
Chen et al., "High Coercivity and High Hysteresis Loop Squareness of Sputtered Co-Re Thin Film", Journal of Applied Physics 50(6), Jun. 1979, pp. 4285-4291.
Weidner et al., "Elementary Modern Physics", pp. 145-150, published by Allyn and Bacon, Inc, 1973.
Fisher et al., "Magnetic Properties and Longitudinal Recording Performance of Corrosion-Resistant Alloy Films" IEEE Trans. on Magnetics, vol. MAG-22, No. 5, Sep. 1986, pp. 352-354.
Yamada et al., "CoNiCr/Cr Sputtered Thin Film Disks", IEEE Trans. on Magnetics, vol. MAG-21, No. 5, Sep., 1985, pp. 1429-1431.
Abe et al., "Orientation Controlled Sputtered CoNi/Cr Recording Rigid Disk", IEEE Transactions on Magnetics, vol. MAG-22, No. 5, Sep. 1986, pp. 570-572.
Teng, "Anisotropy Induced Signal Wafeform Modulation of DC Magnetron Sputtered Thin Film Disks", IEEE Trans. on Magnetics, vol. MAG-22, Sep. 1986, pp. 579-581.
Yamaguchi et al., "Magnetic Properties and Structures of Sputtered CoNi/Cr Films", IEEE Trans. on Magnetics, vol. MAG-22, No. 5, Sep. 1986, pp. 576-578.
Ishikawa et al., "Film Structure and Magnetic Properties of CoNiCr/Cr Sputtered Thin Film", IEEE Trans. on Magnetics, vol. MAG-22, No. 5, Sep. 1986, pp. 573-575.
Tanaka et al., "Noise Characteristics in Plated Co-Ni-P Film for High Density Recording Medium", Journal of Applied Physics 53(3), Mar. 1982, pp. 2576-2578.
Suganuma et al., "Production Process and High Density Recording Characteristics of Plated Disks (Invited)", IEEE Trans. on Magnetics, vol. MAG-18, No. 6, Nov. 1982, pp. 1215-1220.
Uchinami et al., "Magnetic Anisotropic Sputtered Thin Film Disks", Intermag. Conf. Digests, 1987, p. GA-03.
Wolf et al., "The Influence of Ni(P) Underlayers on Magnetic Properites of Electrodeposited Permalloy Films", IEEE Transactions on Magnetics, Sep. 1969, p. 515.
B. D. Cullity, "Introduction To Magnetic Materials", Addison-Wesley Publishing Co., 1972, pp. 534-539.
Doss et al., "Corrosion Mechanism Of Thin Film Disk Magnetic Recording Structures", International Symposium For Testing And Failure Analysis, 1986, pp. 35-38.
Rossi et al., "Vacuum-Deposited Thin-Metal-Film Disk", J. Appl. Phys., vol. 55, No. 6, Mar. 15, 1984, pp. 2254-2256.
Chen Tu
Yamashita Tsutomu T.
Komag, Inc.
Resan Stevan A.
Thibodeau Paul J.
LandOfFree
Magnetic disk for longitudinal recording comprising an amorphous does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic disk for longitudinal recording comprising an amorphous, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic disk for longitudinal recording comprising an amorphous will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1188097