Write Coil Cooling Arms at Air Bearing Surface
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Solution Overview
Problem
Conventional writer designs in magnetic recording heads fail to effectively dissipate heat generated during write operations, leading to Writer-Induced-Writer Protrusion (WIWP) and Laser-Induced-Writer-Protrusion (LIWP), which affects the consistent performance and head-to-medium spacing in heat-assisted magnetic recording (HAMR) systems.
Innovation Solution
The implementation of a write coil cooling arrangement where the write coil and cooling arms are exposed to the air bearing surface (ABS), facilitating heat dissipation through increased air pressure and improved thermal transfer, thereby reducing thermal expansion and protrusion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional writer designs are used, then the structure is simple, but heat dissipation is insufficient leading to WIWP and LIWP
Solution Approach 1:
The writer structure is segmented into multiple functional components: write pole, return pole, write coil, and cooling arms. This segmentation allows the cooling arms to be specifically optimized for heat dissipation while other components handle writing functions, resolving the contradiction between simple structure and effective heat dissipation.
Solution Approach 2:
The cooling arms extend laterally from the write coil in a direction perpendicular to the write direction, utilizing the cross-track dimension for heat dissipation. This dimensional extension provides additional surface area for thermal management without interfering with the primary write function, effectively adding heat dissipation capability without proportionally increasing structural complexity.
2Temperature
If write coil is exposed to ABS for cooling, then heat dissipation improves, but manufacturing precision requirements increase
Solution Approach 1:
The cooling arms are pre-configured with specific geometries and positioning features during manufacturing that anticipate the thermal management requirements. The arms are designed with predetermined lengths, widths, and orientations that optimize cooling while accommodating manufacturing tolerances, reducing the stringency of precision requirements for the final assembly.
Solution Approach 2:
The cooling arms are designed to self-align and self-position relative to the write coil through geometric constraints and mechanical interfaces. This self-service mechanism reduces the need for high-precision external positioning during assembly, as the cooling structure automatically achieves optimal configuration through its own geometric features.
3Stability of the object's composition
If cooling arms are added to write coil, then thermal expansion reduces, but device complexity increases
Solution Approach 1:
The cooling arms are merged with the write coil structure, forming an integrated writer assembly. The cooling arms are directly attached to or formed as part of the coil structure, combining the writing and cooling functions into a single unified component rather than separate assemblies, thereby reducing overall device complexity.
Solution Approach 2:
The writer structure is designed with multi-functionality: the write coil serves both the primary writing function and the heat generation that drives the cooling process. The cooling arms serve dual purposes of thermal management and structural support, while the entire writer assembly maintains both data writing capability and head-to-medium spacing stability, reducing the need for additional dedicated components.
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 solution significantly reduces WIWP and LIWP, maintaining consistent head-to-medium spacing and improving the performance of HAMR systems by effectively dissipating heat generated during write operations.
Implementation Method 1
Cooling arms project laterally from peripheral surfaces of the write coil and extend along the ABS. The media-facing surface of the write coil and the cooling arms are exposed to the ABS to facilitate cooling of the write coil at the ABS.
Data Source
AI summary
A slider comprises an air bearing surface (ABS) and is configured to interact with a magnetic recording medium. A writer is provided on the slider and comprises a write coil having a media-facing surface situated at the ABS. Cooling arms project laterally from peripheral surfaces of the write coil and extend along the ABS. The media-facing surface of the write coil and the cooling arms are exposed to the ABS to facilitate increased cooling of the write coil at the ABS.