Patent ID: 9147423
Filing Date: 2015-09-29
Classification: C22C,G11B

Abstract:
1. A method for making a patterned perpendicular magnetic recording medium having discrete islands of recording layer material, recesses between the islands, and nonmagnetic fill material in the recesses, the method comprising: providing a substrate; depositing on the substrate an underlayer; depositing on the underlayer a recording layer comprising Co, Cr and Pt; depositing on the recording layer a resist layer; patterning the resist layer; etching the recording layer down to the underlayer, using the patterned resist layer as a mask, to transfer the pattern of the patterned resist layer into the recording layer; removing the resist layer to expose discrete islands of recording layer material separated by exposed underlayer, the islands having sidewalls and being arranged in radially-spaced tracks and spaced along the tracks, the exposed underlayer and island sidewalls defining said recesses between the islands without fill material; after removing the resist layer, annealing the islands of recording layer material separated by exposed underlayer, the annealing comprising heating to a temperature greater than or equal to 350 degrees C. and less than or equal to 400 degrees C. and thereafter cooling to below said temperature; and after said cooling, depositing the fill material over the islands into the recesses into contact with the exposed underlayer and island sidewalls.