Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1996-09-24
2000-02-01
Padgett, Marianne
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
427555, 427556, 427557, 427129, 427131, 428694TR, 428694TP, 428694SG, B05D 300, B05D 512, G11B 566, G11B 570
Patent
active
060200456
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the recording, storage and reading of magnetic data, particularly rotatable magnetic recording media, such as thin film magnetic disks having textured surfaces for contact with cooperating magnetic transducer heads. The invention has particular applicability to high density magnetic recording media exhibiting low noise and having improved flying stability, glide performance and head-media interface reliability.
BACKGROUND ART
Magnetic disks and disk drives are conventionally employed for storing data in magnetizable form. Typically, one or more disks are rotated on a central axis in combination with data transducer heads positioned in close proximity to the recording surfaces of the disks and moved generally radially with respect thereto. Magnetic disks are usually housed in a magnetic disk unit in a stationary state with a magnetic head having a specific load elastically in contact with and pressed against the surface of the disk.
In operation, the magnetic disk is normally driven by the contact start stop (CSS) method, wherein the head begins to slide against the surface of the disk as the disk begins to rotate. Upon reaching a predetermined high rotational speed, the head floats in air at a predetermined distance from the surface of the disk due to dynamic pressure effects caused by the air flow generated between the sliding surface of the head and the disk. During reading and recording operations, the transducer head is maintained at a controlled distance from the recording surface, supported on a bearing of air as the disk rotates. The magnetic head unit is arranged such that the head can be freely moved in both the circumferential and radial directions of the disk in this floating state allowing data to be recorded on and retrieved from the surface of the disk at a desired position.
Upon terminating operation of the disk drive, the rotational speed of the disk decreases and the head begins to slide against the surface of the disk again and eventually stops in contact with and pressing against the disk. Thus, the transducer head contacts the recording surface whenever the disk is stationary, accelerated from a stop and during deceleration just prior to completely stopping. Each time the head and disk assembly is driven, the sliding surface of the head repeats the cyclic operation consisting of stopping, sliding against the surface of the disk, floating in the air, sliding against the surface of the disk and stopping.
It is considered desirable during reading and recording operations to maintain each transducer head as close to its associated recording surface as possible, i.e., to minimize the flying height of the head. This objective becomes particularly significant as the areal recording density increases. The areal density (Mbits/in.sup.2) is the recording density per unit area and is equal to the track density (TPI) in terms of tracks per inch times (.times.) the linear density (BPI) in terms of bits per inch. Thus, a smooth recording surface is preferred, as well as a smooth opposing surface of the associated transducer head, thereby permitting the head and the disk to be positioned in closer proximity with an attendant increase in predictability and consistent behavior of the air bearing supporting the head. However, another factor operates against that objective. If the head surface and recording surface are too flat, the precision match of these surfaces gives rise to excessive stiction and friction during the start up and stopping phases, thereby causing wear to the head and recording surfaces eventually leading to what is referred to as a "head crash." Thus, there are competing goals of reduced head/disk friction and minimum transducer flying height.
In order to satisfy these competing objectives, the recording surfaces of magnetic disks are conventionally provided with a roughened surface to reduce the head/disk friction by techniques referred to as "texturing." Conventional texturing techniques involve polishing the surface of a disk sub
REFERENCES:
patent: 3674340 (1972-07-01), Jacob
patent: 3764218 (1973-10-01), Schedewie
patent: 3938878 (1976-02-01), Fox
patent: 4060306 (1977-11-01), Swaminathan
patent: 4139263 (1979-02-01), Lehureau et al.
patent: 4724219 (1988-02-01), Ridinger
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5128914 (1992-07-01), Kurata et al.
patent: 5166606 (1992-11-01), Lal et al.
patent: 5167096 (1992-12-01), Eltouky et al.
patent: 5202810 (1993-04-01), Nakamura et al.
patent: 5273834 (1993-12-01), Hoover et al.
patent: 5391522 (1995-02-01), Goto et al.
patent: 5402407 (1995-03-01), Eguchi et al.
patent: 5416755 (1995-05-01), Endo et al.
patent: 5506017 (1996-04-01), Ranjan et al.
patent: 5520981 (1996-05-01), Yang et al.
patent: 5567484 (1996-10-01), Baumgart et al.
patent: 5582878 (1996-12-01), Ogawa et al.
patent: 5586040 (1996-12-01), Baumgart et al.
patent: 5595791 (1997-01-01), Baumgart et al.
patent: 5614114 (1997-03-01), Owen
patent: 5853820 (1998-12-01), Kuo et al.
Translation of Arita et al PE 195 24 220 A1 (Patent previously cited) Jan. 1996.
Chrisey et al, ed, Pulsed Laser Deposition of Thin Films, John Wiley & Sons, Inc. N.Y. , excerpts p. 34-39, 1994 (no month).
Abstracts of 1996 Intermag Conference, Seattle, WA; p. HA-01: Kuo et al "Design of laser Zone texture for low Glide Media"; p. HA-02:Teng et al, "Laser zone texture on Alternate Substrate disks"; p. HA-05: Kozu et al"Tribological Behavior of Ridgid disks . . . ", 1996 no month given.
Krajnovich et al; Abstracts of 1996 Intermag Conference, Seattle, WA; page unknown "Experimental & Theoretical Studies of Bump Formation During Laser Texturing of N-P " 1996 no month .
Tam et al, Experimental & Theoretical Studies of Bump Formation During Laser Texturing of Ni-P Disk substrates; IEEE Transactions on Magnetics, vol. 32, No. 5 pp. 3771-3773 Sep. 1996.
P. Baumgart et al., "A New Laser Texturing Technique For High Performance Magnetic Disk Drives," IEEE Trans. on Mag, vol. 31, No. 6, pp. 2946-2951, Nov. 1995.
Chen Ga-Lane
Xuan Jialuo Jack
Padgett Marianne
Seagate Technology Inc.
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