Western Digital Corporation

Other

Keith Samuel Goodson

Stella Zofia Gornicki

Chanapatna Krishnamorthy Prabhakara

Amrik Singh Lehil

Wing Tsang Tang

Duncan W Frew

A recording medium on a hard disk is provided that includes a magnetic data recording layer on the disk, a hydrogenated carbon buffer layer over the data recording layer, and a nitrogenated carbon overcoat layer over the hydrogenated carbon buffer layer. The composition ratios and thickness of the recording and nitrogenated carbon overcoat layers are suitably controlled to optimum ranges.

Buffered nitrogenated carbon overcoat for data recording disks and

A method for manufacturing a recording medium on a hard disk includes forming a data recording layer on the disk, forming a nitrogenated carbon overcoat layer over the data recording layer, (with or without intervening layers), and the processing data recording layer to protect it from the nitrogen used in the process of forming the nitrogenated carbon. In one approach, the step of processing the data recording layer is accomplished by forming a buffer layer between the data recording layer and the overcoat layer by depositing carbon on the data recording layer using a carbon deposition process excluding nitrogen, then forming the overcoat layer by depositing carbon on the buffer layer using a carbon deposition process that includes a nitrogen source. In an alternative, the step of processing the data recording layer is accomplished with or without a buffer layer in an automated process by transferring the disk after deposition of the data recording layer into an isolation chamber that has no nitrogen, and then into a nitrogenated carbon deposition chamber thereby preventing contamination of the data recording layer deposition process by nitrogen used in the overcoat layer deposition step.

A coating composition for use in the preparation of magnetic recording media is described. The composition contains finely divided magnetic particles dispersed in an organic solvent, containing in solution a hydroxyl group containing polymer having an OH number between about 100-500, a polyether urethane elastomer, an aliphatic polyisocyanate and a copper containing chelate catalyst, the organic portion of said chelate being of the general chemical structure ##STR1## wherein R and R' can be the same or different and represent alkyl groups containing 1-18 carbon atoms and aromatic groups, both substituted and unsubstituted.

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San Jose, CA, United States of America

Keith Samuel Goodson