Magnetic recording medium
AssigneeKabushiki Kaisha Toshiba
InventorsToshiyuki Suzuki, Reiji Nishikawa
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Abstract
In a magnetic recording disk of a double-sided recording type according to a perpendicular magnetic recording technique of the invention, recording layers having different film thicknesses are formed on two surfaces of a base layer. The film thickness of one magnetic recording layer is set to be larger than the film thickness of the other magnetic recording layer. Thus, a curl phenomenon can be prevented. In addition, a coercive force of the thicker recording layer is set to be higher than that of the thinner recording layer. A difference in a perpendicular recording density between the two recording layers due to a difference in the film thickness thereof can be compensated for.
Claims4
A disk-shaped magnetic recording medium which can record data on two surfaces thereof in accordance with a perpendicular magnetic recording technique, comprising:
- a flexible base layer;
- and
- magnetic recording layers which sandwich said base layer therebetween and are formed to have different film thicknesses whose ratio is set so as to prevent a curl phenomenon from occurring in said magnetic recording medium, wherein a first recording layer is, thicker than a second recording layer, and has a perpendicular coercive force which is higher than that of said second recording layer so as to compensate for a decrease in a perpendicular recording density of said first recording layer due to the enlargement in thickness thereof, whereby the amount of a curl occurring in said recording medium may be minimized, and any non-coincidence between perpendicular recording densities of said first and second recording layers may be simultaneously compensated for.
Dependencies are inferred from the claim text.