Inventors:
Wei H. Yao - Fremont CA
Yuh-Jen Cheng - Cupertino CA
Li-Ping Wang - Fremont CA
David S. Kuo - Castro Valley CA
Chiao-Ping Ku - Fremont CA
Bruno Marchon - Palo Alto CA
Assignee:
Seagate Technology LLC - Scotts Valley CA
International Classification:
G11B 582
US Classification:
428141, 428 642, 428 653, 428426, 428694 SG, 360135
Abstract:
A magnetic data recording medium substrate has a contact zone and a data zone. The contact zone is textured by forming multiple texturing features, each having a bell-shaped profile resembling a Gaussian curve. The features preferably are formed by pulsed laser energy applied to a glass substrate, or to an aluminum nickel-phosphorous substrate coated with a glass layer. As compared to previous laser texturing approaches, the laser beam is less narrowly focused to provide a beam impingement area with a diameter of at least three microns, forming texturing features with diameters of at least three microns. The texturing features preferably are uniform in height and diameter, and may be symmetrical or have asymmetrical aspects, so long as bell-shaped profiles are present in the direction of travel of the recording medium, relative to transducing heads.