Formation of Magnetic Images
Original Publication Date: 1980-Nov-01
Included in the Prior Art Database: 2005-Feb-14
The formation of magnetic images and patterns and discrete-magnetic tracks can aid in servo operation of transducers on magnetic media to minimize off-track operation and reduce guard band. Magnetic images can be produced on a surface in situ by X-ray or E-beam irradiation of iron, cobalt or nickel salts dispersed in a polymer matrix along with the use of a suitable mask, e.g., one made from lead, to selectively shield portions of the sample from irradiation. Although some darkening of the exposed areas occurs during irradiation, the image is enhanced by subsequent development in a bath containing a salt of iron, cobalt or nickel in conjunction with sodium hypophosphite, ammonium hydroxide or other base and, optionally, a stabilizer such as sodium citrate.