Fabrication of Anisotropic Particulate Media for Magnetic and Optical Storage Applications
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18
A media fabrication process leads to particulate recording media with controlled particle size and anisotropy. The process is applicable to many types of magnetic and optical recording media. The process consists of two steps. First, an anisotropic texturing is plasma-etched into a substrate or into a layer coated on top of a substrate. This texturing technique is well known and is well practiced in the field of solar absorbers. The size and anisotropy of the texturing can be varied through changes in the plasma conditions. Roughnesses from 100's of Angstroms to about a micron are achievable with aspect ratios as large as 10:1. Secondly, the active medium is vacuum-deposited. Thus, it is possible to make anisotropic particulate films of any active material.