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, further comprising a first recording layer, an auxiliary recording layer, and a second recording layer laminated in this sequence on the soft magnetic lining layer;
whereinthe first recording layer and the second recording layer are ferromagnetic layers having a magnetization easy axis perpendicular to the layers;
the auxiliary recording layer includes a plurality of magnetic particles that are mutually separated by a non-magnetism members, wherein the magnetic particles are formed perpendicular to the layer, and the magnetic particles have a magnetization easy axis in a direction slanted to the layer; and
the auxiliary recording layer is exchange-coupled with the first recording layer and the second recording layer.
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Accused Products
Abstract
A perpendicular magnetic recording medium, its manufacturing method, and a magnetic storage apparatus including the perpendicular magnetic recording medium are disclosed.
The 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 22.
17 Citations
20 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, further comprising a first recording layer, an auxiliary recording layer, and a second recording layer laminated in this sequence on the soft magnetic lining layer;
whereinthe first recording layer and the second recording layer are ferromagnetic layers having a magnetization easy axis perpendicular to the layers; the auxiliary recording layer includes a plurality of magnetic particles that are mutually separated by a non-magnetism members, wherein the magnetic particles are formed perpendicular to the layer, and the magnetic particles have a magnetization easy axis in a direction slanted to the layer; and the auxiliary recording layer is exchange-coupled with the first recording layer and the second recording layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A manufacturing method of a perpendicular magnetic recording medium, comprising:
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a step of forming a soft magnetic lining layer on a substrate; a step of forming a first recording layer that has a magnetization easy axis perpendicular to the layer on the soft magnetic lining layer; a step of forming an auxiliary recording layer on the first recording layer; and a step of forming a second recording layer that has a magnetization easy axis perpendicular to the layer on the auxiliary recording layer;
whereinthe step of forming the auxiliary recording layer forms the auxiliary recording layer by a sputtering method, wherein a target includes a ferromagnetic material that mainly includes CoCr, wherein Cr content ranges between 5 at % and 25 at %. - View Dependent Claims (20)
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19. A manufacturing method of a perpendicular magnetic recording medium, comprising:
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a step of forming a soft magnetic lining layer on a substrate; a step of forming a first recording layer that has a magnetization easy axis perpendicular to the layer on the soft magnetic lining layer; a step of forming an auxiliary recording layer on the first recording layer; a step of forming a second recording layer that has a magnetization easy axis perpendicular to the layer on the auxiliary recording layer;
whereinthe step of forming the auxiliary recording layer forms the auxiliary recording layer by a sputtering method wherein a ferromagnetic material that mainly includes CoCr, wherein Cr content ranges between 5 at % and 25 at %, and a non-magnetism compound that is non-solid-soluble are simultaneously sputtered.
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Specification