Thermally assisted recording system
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsFumiko Akagi, Masukazu Igarashi, Hideki Saga
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Abstract
A thermally assisted magnetic recording system is provided to achieve excellent thermal resistance and low noise. In one embodiment, a magnetic recording medium is used, in which the magnetic intergrain exchange coupling is large to let the magnetization be thermally stable by coupling the magnetic grains constituting the recording layer at room temperature (the temperature maintaining the magnetization) and reduced by heating during recording to let the recording magnetization transition slope become steep. Parameter A normalizing the slope around the coercivity of the MH-loop of the medium is 1.5≦A<6.0 at room temperature, and it becomes approximately 1.0 with heating.
Claims5
A thermally assisted recording system comprising a magnetic recording medium, a magnetic pole applying a magnetic field to said magnetic recording medium, and a heating mechanism to heat a magnetic field applied region of said magnetic recording medium, wherein
- said magnetic recording medium has a substrate and a recording layer formed on a substrate,
- said recording layer is a CoCr system alloy layer consisting of magnetic grains and grain boundaries, in which the Cr content of said grain boundaries is about 30-40 at %,
- and an amorphous TbFeCo layer, a CoCr layer, a lamination layer of CoCr and Pt, or a lamination layer of CoCr and Pd, with a film thickness of about 5 nm or less are sputter-deposited on said substrate side.
Dependencies are inferred from the claim text.