Plasma Ash or Laser Burn Pattern of Submicron Holes at Disk ID for Improved Lubricant Distribution With Time
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Depletion of the surface lubricant on a magnetic recording disk is primarily due to spin-off initiated by a centrifugal field. Under centrifugal stress, lubricant will migrate from the inside diameter (ID) to the outside diameter (OD). Some subsurface (within the magnetic coating itself) lubricant is thought to be a potential reservoir for replenishing the spun-off (lost) lubricant. Described here is a laser burning or plasma ashing of a pattern of submicron holes at the ID edge of the magnetic coating (preferably off the data storage area) which would hold a larger volume of lubricant and which would release lubricant with time to replenish lubricant that is spun off. This would require holes only at the ID rather than over the whole magnetic surface.