The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1996
Filed:
Oct. 06, 1993
Christopher V Jahnes, Monsey, NY (US);
James H Kaufman, San Jose, CA (US);
Serhat Metin, San Jose, CA (US);
Mohammad T Mirzamaani, San Jose, CA (US);
Anthony W Wu, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A thin film metal alloy magnetic recording disk has an improved protective overcoat that creates a low level of static friction in a contact start/stop disk drive. The disk has an amorphous carbon overcoat containing a transition liquid metal interlayer (TLMI). The carbon overcoat is formed by depositing an initial amorphous carbon layer to a first thickness, then depositing an interlayer material of a low-melting point metal or metal alloy (such as In or In--Nb) while maintaining the temperature of the disk substrate above the melting point of the interlayer material, and then depositing a top additional layer of amorphous carbon. Because the initial carbon layer presents a nonwetting surface, the interlayer material 'balls up' on the carbon and forms discontinuous spheres of the interlayer material. The additional top layer of carbon bonds to the initial carbon layer and to the metal or metal alloy spheres. The completed disk protective overcoat presents a continuous but textured surface of amorphous carbon for the head-disk interface in the disk drive.