Vacuum Deposited Particulate Magnetic Recording Layer
Original Publication Date: 1979-Mar-01
Included in the Prior Art Database: 2005-Feb-20
Magnetic storage layers used widely with tapes and disks consist of Gamma Fe(2)O(3) particles embedded in an epoxy resin matrix. These layers, resistant to mechanical wear, are problematical with regard to the storage density obtainable. The storage density is governed by various factors mutually influencing each other. Higher storage densities require thinner layers, and the filling factor, i.e., the volume fraction of the particles in the layer, must not exceed 20 per cent, because, otherwise, with the usual liquid dispersion coating technique, coagulation of the particles caused by magnetic interaction cannot be avoided. The natural fluctuations in the number of particles per bit cell lead to read signal noise.