Patent ID: 6565929
Filing Date: 2003-05-20
Classification: G11B

Abstract:
A method of manufacturing a magnetic medium for data storage, comprising the following steps:supplying a layer of a material capable of varying its magnetic characteristics under an effect of a plurality of charged particles on a nonmagnetic substrate; using a material having a low or zero initial magnetization as said material capable of varying its magnetic characteristics; selectively irradiating said layer with a flux of said plurality of charged particles to vary said magnetic characteristics of said material of said layer on a plurality of the irradiated segments thereof, and forming a plurality of nonmagnetic segments, each having a first, second, and third overall dimension; forming a plurality of magnetic segments on said layer, each of said segments having a first overall dimension which is a maximum, wherein a ratio between said first dimension and said second or third overall dimension being from (3.5Ã·15.0):1; wherein said layer has a thickness equal to said first, second or third overall dimension of any magnetic segment selected from a plurality of said magnetic segments.