Non-Abrasive, Magnetic Metal Thin-Film Disk and Method for Making Same
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15
The disk comprises the illustrated substrate 1, an underlayer 2, 4 with embedded non-abrasive particles 3 of a substantially homogeneous diameter, a magnetic thin film 5 and, optionally, a carbon overcoat 6 with particles 3 extending beyond the surface of film 5. To form the disk on substrate 1 of, e.g., aluminum, a thin seed layer 2 of, e.g., NiP, is deposited by plating in a first bath in which non-abrasive particles 3 of, e.g., Al2O3, are dispersed. The non- abrasive particles 3 are built into the growing seed layer 2. Subsequently, in a second electroplating bath, whose composition, except for the particles, is the same as that of the first bath, the deposition process continues until underlayer 2, 4 has its desired thickness.