2008 Volume 33 Issue 4 Pages 885-888
A hard/soft magnetic composite pillar array medium is proposed for the ultra high density recording medium. Magnetization reversal process for a single hard/soft magnetic composite pillar in the medium is calculated using the Landau-Lifshitz-Gilbert equation. In the case that the pillar size which corresponds to 1 Tbits/inch2 or higher areal recording density, magnetization vectors for the soft magnetic unit do not form a domain wall nor a vortex. Hence, noise caused by the domain wall or the vortex for the soft magnetic unit is considered to be none. Magnetization reversal of the soft magnetic unit helps the magnetization reversal for the hard magnetic unit, reducing the effective coercivity for the hard magnetic unit greatly. Accordingly saturation recording to the high-Ku hard magnetic material used for perpendicular magnetic recording will be realizable.
