High density information recording medium, and manufacturing method of the same medium
AssigneeGovernor of Akita Prefecture
InventorsToshio Suzuki, Naoki Honda, Kazuhiro Ouchi
Life of this patent
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Abstract
To present an information recording medium for achieving high density information recording, in particular, a high signal output and a high resolution in magnetic recording, for example, an information recording medium sequentially forming a layer made of soft magnetic material, a layer made of nonmagnetic material, and an information recording layer of ordered alloy with L10 crystal structure selected from group A is manufactured in a specified manufacturing method. Herein the group A is defined to include FePt ordered alloy, CoPt ordered alloy, FePd ordered alloy, and their alloy.
Claims8
An information recording medium comprising:
- (a) a layer structure sequentially forming a layer made of soft magnetic material;
- (b) a layer made of MgO;
- and
- (c) an information recording layer of ordered alloy with L10 crystal structure selected from the group consisting of FePt ordered alloy, CoPt ordered alloy, FePd ordered alloy, and alloys thereof.
A manufacturing method for an information recording medium comprising sequentially fabricating a soft magnetic layer, a nonmagnetic layer, and an information recording layer of an ordered alloy with L10 crystal structure selected from the group consisting of FePt ordered alloy, CoPt ordered alloy, FePd ordered alloy, and alloys thereof, wherein said information recording layer of ordered alloy L10 crystal structure is fabricated by a sputter-deposition method at a substrate temperature of 400° C. or less, using a sputtering target manufactured by a melting method.
An information recording medium in a layered structure sequentially comprising:
- (a) an underlayer consisting essentially of an element or compound selected from the group consisting of Cr, Pt, Pd, Au, Fe, Ni, MgO, and NiO, said element or compound controlled so that the Miller index (100) of its crystal lattice plane is parallel to the other adjacent layers;
- (b) a layer made of soft magnetic material;
- (c) a layer made of MgO;
- and
- (d) an information recording layer of ordered alloy with L10 crystal structure selected from the group consisting of FePt ordered alloy, CoPt ordered alloy, FePd ordered alloy, and alloys thereof.
An information recording medium in a layered structure sequentially comprising:
- (a) an underlayer consisting essentially of an element or compound selected from the group consisting of Cr, Pt, Pd, Au, Fe, Ni, MgO, and NiO, said element or compound controlled so that the Miller index (100) of its crystal lattice plane is parallel to the other adjacent layers;
- (b) a layer made of soft magnetic material, wherein said soft magnetic material is selected from the group consisting of Fe, Fe—Si alloy, and Ni—Fe alloy;
- (c) a layer made of MgO;
- and
- (d) an information recording layer of ordered alloy with L10 crystal structure selected from the group consisting of FePt ordered alloy, CoPt ordered alloy, FePd ordered alloy, and alloys thereof.
Dependencies are inferred from the claim text.