Recessed Antiferromagnetic Read Head Thermal Stabilization
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Solution Overview
Problem
The need for increased data density in magnetic media drives has been limited by the physical and manufacturing constraints on reducing the gap thickness of magnetic read heads, particularly due to the reduced antiferromagnetic pinning strength when the antiferromagnetic layer is recessed from the media facing surface.
Innovation Solution
A magnetic read head design that includes an antiferromagnetic layer recessed from the media facing surface, a reference layer, a free layer, and a thermally conductive structure with a 'T' shape, where the thermally conductive structure extends towards the media facing surface to align with the free layer, enhancing thermal stabilization and maintaining pinning strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the antiferromagnetic layer is recessed from the media facing surface to achieve smaller read gap, then the resolution is improved, but the antiferromagnetic pinning strength is reduced
Solution Approach 1:
The patent applies local quality by creating a non-uniform thermally conductive structure with different portions having different thermal conductivities. The first portion (aligned with the free layer) has higher thermal conductivity than the second portion, providing localized thermal stabilization exactly where needed to maintain pinning strength at the recessed antiferromagnetic layer while allowing the overall gap to be reduced for improved resolution.
2Measurement precision
If the gap thickness is decreased to increase data density, then the resolution is improved, but the manufacturing precision becomes more difficult to achieve
Solution Approach 1:
The thermally conductive structure serves as an intermediary element between the antiferromagnetic layer and the surrounding environment. This mediator provides controlled thermal pathways that stabilize the recessed antiferromagnetic layer, enabling the manufacturing of smaller gaps with adequate pinning strength through thermal management rather than relying solely on precise mechanical gap control.
3Length of moving object
If the antiferromagnetic layer is recessed from the media facing surface, then the read gap is reduced, but the stability of the read head is negatively affected
Solution Approach 1:
The patent changes the thermal conductivity parameter of the structure by incorporating a thermally conductive material with specific thermal properties. This parameter change creates localized thermal pathways that stabilize the recessed antiferromagnetic layer, allowing the read gap to be reduced while maintaining read head stability through thermal field control rather than relying solely on the physical proximity of the antiferromagnetic layer to the media facing surface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves thermal stabilization and improved pinning strength, allowing for smaller read gaps and higher resolution while maintaining the stability of the read head.
Implementation Method 1
a thermally conductive structure disposed over the reference layer. The thermally conductive structure is recessed from the MFS. The thermally conductive structure includes a first portion and a second portion. The first portion of the thermally conductive structure extends from the second portion of the thermally conductive structure towards the MFS. The first portion of the thermally conductive structure is aligned with the free layer in a stripe height direction. With the thermally conductive structure, thermal stabilization of the read head is achieved.
Data Source
AI summary
The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic read head. The magnetic read head includes an antiferromagnetic layer recessed from the MFS, a reference layer disposed over the antiferromagnetic layer, a free layer disposed over the reference layer, and a thermally conductive structure disposed over the reference layer. The thermally conductive structure is recessed from the MFS. The thermally conductive structure includes a first portion and a second portion. The first portion of the thermally conductive structure extends from the second portion of the thermally conductive structure towards the MFS. The first portion of the thermally conductive structure is aligned with the free layer in a stripe height direction. With the thermally conductive structure, thermal stabilization of the read head is achieved.