US 2019/0325905 A1Published application

Magnetic media design with multiple non-magnetic exchange control layers

AssigneeWestern Digital Technologies, Inc.

InventorsKai Tang, Arien Michael Ghaderi, Tuqiang Li, Chi Ho Lo

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Abstract

Magnetic media including a magnetic recording layer structure of at least six magnetic recording sublayers and at least six non-magnetic exchange control sublayers in an alternating pattern are provided. The magnetic recording layer structure includes a gradient of platinum content across the magnetic recording sublayers such that a top magnetic recording sublayer has a lowest platinum content and a bottom magnetic recording sublayer has a highest platinum content. In one such case, the magnetic media includes a substrate and the magnetic recording layer structure on the substrate. In another case, a method of fabricating such magnetic media is provided.

Claims30

Dependent claims

A magnetic medium, comprising:

a substrate;
and
a magnetic recording layer structure on the substrate, the magnetic recording layer structure comprising an alternating pattern of magnetic recording sublayers and non-magnetic exchange control sublayers;
wherein the magnetic recording layer structure comprises at least six of the magnetic recording sublayers and at least six of the non-magnetic exchange control sublayers;
and
wherein the magnetic recording layer structure further comprises a gradient of platinum content across the magnetic recording sublayers such that a bottom magnetic recording sublayer of the magnetic recording sublayers that is nearest the substrate comprises a highest platinum content among the magnetic recording sublayers and a top magnetic recording sublayer of the magnetic recording sublayers that is furthest from the substrate comprises a lowest platinum content among the magnetic recording sublayers.

3 more elements

A method for fabricating magnetic media, comprising:

providing a substrate;
forming a soft underlayer on the substrate;
forming a seed layer on the soft underlayer;
and
forming a magnetic recording layer structure on the seed layer, the magnetic recording layer structure comprising an alternating pattern of magnetic recording sublayers and non-magnetic exchange control sublayers;
wherein the magnetic recording layer structure comprises at least six of the magnetic recording sublayers and at least six of the non-magnetic exchange control sublayers;
and
wherein the magnetic recording layer structure further comprises a gradient of platinum content across the magnetic recording sublayers such that a bottom magnetic recording sublayer of the magnetic recording sublayers that is nearest to the substrate comprises a highest platinum content among the magnetic recording sublayers and a top magnetic recording sublayer of the magnetic recording sublayers that is furthest from the substrate comprises a lowest platinum content among the magnetic recording sublayers.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/959,120Filed 20 Apr 2018
Published: 24 Oct 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G11B 5/678
Having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer: having three or more magnetic…
G11B 5/82
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum: disk carriers
G11B 5/84
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: processes or apparatus…
G11B 5/851
Processes or apparatus specially adapted for manufacturing record carriers: coating a support with a magnetic layer by sputtering