Magnetic recording medium for perpendicular recording
View Patent ↗A perpendicular magnetic recording medium at least comprises a perpendicular magnetic recording layer and a backing layer backing the perpendicular magnetic recording layer. The backing layer has an in-plane magnetization and is formed of a ferrimagnetic material having a compensation temperature in the vicinity of a recording/reproducing temperature in which reproducing of magnetic information is made from the perpendicular magnetic recording layer. A magnetic storage apparatus for recording and reproducing magnetic information using the perpendicular magnetic recording medium is also disclosed.
1. A perpendicular magnetic recording medium comprising at least a perpendicular magnetic recording layer and a backing layer backing said perpendicular magnetic recording layer, said backing layer having an in-plane magnetization,
characterized in that said backing layer is formed of a ferrimagnetic material having a compensation temperature in the vicinity of a recording/reproducing temperature in which reproducing of magnetic information is made from said perpendicular magnetic recording layer,
wherein said ferrimagnetic backing layer has an easy axis in an in-plane direction.
2. The perpendicular magnetic recording medium as claimed in claim 1 , characterized in that said recording/reproducing temperature is −20 to +100°C.
3. The perpendicular magnetic recording medium as claimed in claim 1 or 2 , characterized in that said ferrimagnetic material is any of an alloy of GdFe, an alloy of DyFe and a garnet ferrite.
4. The perpendicular magnetic recording medium as claimed in claim 3 , characterized in that said perpendicular magnetic recording layer is any of a single layer perpendicular magnetic film or a multilayer perpendicular magnetic film.