Perpendicular magnetic recording medium, its manufacturing method, and a magnetic storage apparatus
First Claim
1. A perpendicular magnetic recording medium, comprising:
- a substrate;
a soft magnetic lining layer formed on the substrate; and
a recording layer comprising a first recording layer, an auxiliary recording layer, and a second recording layer laminated in this sequence on the soft magnetic lining layer;
wherein each of the first recording layer and the second recording layer is formed by a ferromagnetic layer having a magnetization easy axis perpendicular to the ferromagnetic layer;
the auxiliary recording layer includes a plurality of magnetic particles that are mutually separated by non-magnetism membersand are formed perpendicular to the ferromagnetic layer;
the magnetic particles have magnetization easy axes uniformly angled at a predetermined angle selected within a range between 60°
(degrees) and 80°
(degrees) with reference to the ferromagnetic layer; and
the auxiliary recording layer is exchange-coupled to the first recording layer and the second recording layer, and in contact with the first recording layer or the second recording layer.
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Accused Products
Abstract
A perpendicular magnetic recording medium includes a substrate, a soft magnetic lining layer formed on the substrate, and a recording layer. The recording layer includes a first recording layer, an auxiliary recording layer, and a second recording layer that are laminated in this sequence. The first and the second recording layers are ferromagnetic layers that have a magnetization easy axis perpendicular to the layers. The auxiliary recording layer includes two or more magnetic particles mutually separated by non-magnetism members, wherein the magnetic particles are arranged approximately perpendicular to the layer and have the magnetization easy axis in a direction slanted with reference to the layer. The auxiliary recording layer is exchange-coupled with the adjoining first recording layer and second recording layer. The perpendicular magnetic recording medium may include an exchange-coupling-strength control layer between the first recording layer and the auxiliary recording layer, or alternatively, between the auxiliary recording layer and the second recording layer.
3 Citations
16 Claims
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1. A perpendicular magnetic recording medium, comprising:
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a substrate; a soft magnetic lining layer formed on the substrate; and a recording layer comprising a first recording layer, an auxiliary recording layer, and a second recording layer laminated in this sequence on the soft magnetic lining layer; wherein each of the first recording layer and the second recording layer is formed by a ferromagnetic layer having a magnetization easy axis perpendicular to the ferromagnetic layer; the auxiliary recording layer includes a plurality of magnetic particles that are mutually separated by non-magnetism members and are formed perpendicular to the ferromagnetic layer; the magnetic particles have magnetization easy axes uniformly angled at a predetermined angle selected within a range between 60°
(degrees) and 80°
(degrees) with reference to the ferromagnetic layer; andthe auxiliary recording layer is exchange-coupled to the first recording layer and the second recording layer, and in contact with the first recording layer or the second recording layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification