Method of Producing Magnetic Disks With Capacitively Sensed Position Tracks
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Capacitively sensed tracks may be created for a magnetic disk having a silicon substrate by depositing an amorphous silicon film on the substrate and forming a pattern of servo tracks in the amorphous film by selectively annealing the amorphous layer with a laser before deposition of the ferrite film. Silicon has been proposed as a substrate material for high quality magnetic recording disks. We propose a method of laying down "servo tracks" which do not take up valuable magnetic area on the disk, and which could conceivably have higher resolution than the approximately 7-micron resolution of existing magnetic heads. A highly doped n or p type silicon wafer would be the starting point. The silicon wafer then would be highly chemically polished on both sides, and a mandrel hole would be formed in the center.