Vertical Orientation of Acicular Magnetic Particles
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
Vertical inductive magnetic recording, in which the medium has its easy axis of magnetization perpendicular to the plane of the medium, has been seriously considered in recent years as a means of increasing recording density. The increase in density arises from the expected disappearance of the demagnetization field for vertical recording. Demagnetization places an upper limit on the recording density that can be obtained for a given medium coercivity. Two approaches for producing a particulate vertical recording medium can be considered. First, one can simply replace the normally used q-Fe2O3 particles with different particles. An example of such particles are disk-shaped barium ferrite particles.