Magnetic recording medium having a patterned exchange-coupling control layer and method of manufacturing same
AssigneeFuji Electric Device Technology Co., Ltd.
InventorSadayuki Watanabe
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Abstract
A magnetic recording medium is formed by stacking in order, on a nonmagnetic base, at least an underlayer, magnetic recording layer, and protective layer. The magnetic recording layer includes a plurality of magnetic layers and an exchange-coupling control layer, and the magnetic recording medium is characterized in that a physical pattern is formed in the exchange-coupling control layer. The exchange-coupling control layer is located between the magnetic layers of the magnetic recording layer.
Claims17
A perpendicular magnetic recording medium comprising:
- a nonmagnetic base;
- an underlayer formed on the nonmagnetic base;
- and
- a magnetic recording layer formed on the underlayer;
- wherein the magnetic recording layer includes a continuous first magnetic layer, a continuous second magnetic layer and a patterned exchange-coupling control layer having a thickness of 2 nm or less located between the first magnetic layer and the second magnetic layer
- wherein the magnetic recording layer is divided into signal recording regions and non-signal recording regions, each having different magnetic characteristics, and wherein the difference in the magnetic characteristics is brought about by the presence or absence of, or by a difference in the film thickness of, the patterned exchange-coupling control layer, and wherein the exchange coupling control layer is arranged such that the signal recording region is thicker than the non-signal recording regions.
A magnetic recording medium manufacturing method of manufacturing a perpendicular magnetic recording medium, the method comprising:
- forming an underlayer on a nonmagnetic base;
- forming a magnetic recording layer on the underlayer;
- and
- forming a protective layer on the magnetic layer;
- wherein the forming of the magnetic recording layer includes forming a patterned exchange-coupling control layer having a thickness of 2 nm or less between a continuous first magnetic layer and a continuous second magnetic layer
- wherein the magnetic recording layer is divided into signal recording regions and non-signal recording regions, each having different magnetic characteristics, and wherein the difference in the magnetic characteristics is brought about by the presence or absence of, or by a difference in the film thickness of, the patterned exchange-coupling control layer, and wherein the exchange coupling control layer is arranged such that the signal recording region is thicker than the non-signal recording regions.
Dependencies are inferred from the claim text.