Magnetic recording media including magnetically soft composite layer and method of making same
AssigneeSeagate Technology LLC
InventorsDmitri Litvinov, Sakhrat Khizroev
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Abstract
Magnetic recording disks having a composite soft magnetic layer are provided. The soft magnetic layer includes a relatively thick layer of low saturation moment soft magnetic material and a relatively thin layer of high saturation moment soft magnetic material. In a preferred embodiment, the thin layer of soft magnetic material is deposited over the thick layer, followed by deposition of a magnetically hard perpendicular recording layer.
Claims24
A magnetic recording disk comprising a magnetically hard recording layer and a magnetically soft layer, wherein the magnetically soft layer includes a layer of low saturation moment magnetically soft material and a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material adjacent to the magnetically hard recording layer, and the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material.
A method of making a soft magnetic layer of a magnetic recording disk, the method comprising:
- depositing a layer of low saturation moment soft magnetic material on the disk;
- and
- depositing a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material over the layer of low saturation moment magnetically soft material, wherein the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material.
A magnetic recording disk comprising a magnetically hard recording layer and a magnetically soft layer, wherein the magnetically soft layer includes a layer of low saturation moment magnetically soft material and a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material adjacent to the magnetically hard recording layer, and the layer of low saturation moment magnetically soft material has a thickness at least five times greater than the layer of high saturation moment magnetically soft material.
A magnetic recording disk comprising a magnetically hard recording layer and a magnetically soft layer, wherein the magnetically soft layer includes a layer of low saturation moment magnetically soft material and a layer of high saturation moment magnetically soft material having a higher saturation moment ,than the low saturation moment magnetically soft material adjacent to the magnetically hard recording layer, the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material, and the layer of high saturation moment magnetically soft material has a BS of greater than 1.6 Tesla.
A magnetic recording disk comprising a magnetically hard recording layer and a magnetically soft layer, wherein the magnetically soft layer includes a layer of low saturation moment magnetically soft material and a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material adjacent to the magnetically hard recording layer, the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material, and the layer of high saturation moment magnetically soft material comprises at least one material selected from the group consisting of FeAlN, FeTaN and CoFe.
A magnetic recording disk comprising a magnetically hard recording layer, a magnetically soft layer and an exchange decouple layer between the magnetically hard recording layer and the magnetically soft layer, wherein the magnetically soft layer includes a layer of low saturation moment magnetically soft material and a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material adjacent to;
- the magnetically hard recording layer, and the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material.
A method of making a soft magnetic layer of a magnetic recording disk, the method comprising:
- depositing a layer of low saturation moment soft magnetic material on the disk;
- polishing the surface of the layer of low saturation moment magnetically soft material;
- and
- depositing a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material over the layer of low saturation moment magnetically soft material, wherein the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material.
A method of making a soft magnetic layer of a magnetic recording disk, the method comprising:
- depositing a layer of low saturation moment soft magnetic material on the disk by plating;
- and
- depositing a layer of high saturation moment magnetically soft material having a higher saturation moment than the low saturation moment magnetically soft material over the layer of low saturation moment magnetically soft material, wherein the layer of high saturation moment magnetically soft material is thinner than the layer of low saturation moment magnetically soft material.
Dependencies are inferred from the claim text.