Patent ID: 7608348
Filing Date: 2009-10-27
Classification: G11B

Abstract:
1. A magnetic medium for storing information, comprising: at least two materials A and B connected with one another; said material A being a hard magnetic material, said material Λ having a first coercivity Hc and a first remenence at a given temperature when independently situated; said material B being a material which exhibits metamagnetic behavior in a magnetic field at said given temperature, the metamagnetic behavior of the material B being such that, even after passing repeatedly through an external magnetic field from 0 to 10 Tesla at least at a magnetic field strength below 3 Tesla, an increase in magnetization occurs as a function of the magnetic field, the increase being superproportional and having a positive curvature and occurring at a transition field H said increase in magnetization of said material B at said transition field level H