Magnetic recording medium with high non-operational shock resist

Details Magnetic recording medium with high non-operational shock resist Magnetic recording medium with high non-operational shock resist

1998-11-17

2000-11-28

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428 653, 428694TR, 428694SG, 428900, 360135, 360 9701, 427129, 427131, 427554, G11B 571

Patent

active

061532843

ABSTRACT:
Non operational shock resistance is achieved by preventing separation of the read/write head from the disk. Embodiments include optimizing the normal stiction force of a lubricant topcoat by controlling the texture geometry of the landing zone and lubricant topcoat thickness, particularly the density of protrusions. Laser textured landing zones having a protrusion density above about 4,500 protrusions/mm.sup.2 can provide an optimal normal stiction force in excess of 25 gf per interface and a lateral stiction force below 10 gf per interface.

REFERENCES:
patent: 5550696 (1996-08-01), Nguyen
patent: 5742518 (1998-04-01), Gui et al.
patent: 5949612 (1999-09-01), Gudeman et al.
patent: 5976714 (1999-11-01), Arita et al.
patent: 6007896 (1999-12-01), Bhushan
"Overcoats and Lubrication for Thin Film Disks", A.M. Homola, et al., MRS Bulletin, Mar. 1990, pp. 45-52.
"Application of Disjoining and Capillary Pressure to Liquid Lubricant Films in Magnetic Recording", C. Mathew Mate, J. Appl. Phys. 72 (7), Oct. 1, 1992, pp. 3084-3090.
"A Stiction Model for a Head-disk Interface of a Rigid Disk Drive", J. Gui, et al., J. Appl. Phys. 78 (6), Sep. 15, 1995, pp. 4206-4217.

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