Coplanar Dual Loop Reader Heater for HAMR
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Solution Overview
Problem
Current magnetic recording technologies, particularly in heat-assisted magnetic recording (HAMR), face challenges in balancing the size and shape of the contact area of the reader heater to manage temperature and resistance effectively, leading to inefficient read signal strength and reliability.
Innovation Solution
The implementation of a dual loop reader heater design with planar loops positioned in the same plane, which reduces electrical resistance and spreads heat density across a larger area, providing independent control over stroke efficiency and contact area size/shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single loop reader heater is used, then the device complexity is low, but the electrical resistance is high and heat density is concentrated
Solution Approach 1:
The reader heater is divided into multiple planar loops (first loop and second loop) that are positioned in the same plane. This segmentation allows the heater to have multiple current paths, reducing electrical resistance while distributing heat generation across a larger area. The loops are configured to be coplanar, enabling independent control of stroke efficiency and contact area characteristics.
2Ease of manufacture
If a single loop reader heater is used, then the manufacturing is simple, but the contact area control is limited
Solution Approach 1:
The dual loop configuration enables dynamic control over the contact area characteristics. By adjusting the geometry, size, and positioning of the first and second planar loops, the contact area size and shape can be independently optimized for different operational requirements. The coplanar arrangement allows for precise control of heat distribution patterns.
3Device complexity
If a single loop reader heater is used, then the structure is simple, but the read sensor element temperature is high
Solution Approach 1:
The heater is segmented into multiple planar loops that distribute heat generation across a larger area. This segmentation reduces the concentration of heat at any single point, thereby lowering the read sensor element temperature while maintaining effective heating for the reading operation.
Solution Approach 2:
The heater design transitions from a single-loop configuration to a multi-loop coplanar arrangement, effectively utilizing the planar dimension to spread heat distribution. This dimensional expansion of the heater structure allows for better thermal management by distributing power density across multiple locations in the same plane.
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 a lower read sensor element temperature, increased control over the contact area, and improved reliability of the read signal while maintaining efficient heat generation, addressing the limitations of single loop heater configurations.
Implementation Method 1
a reader heater configured to cause a protrusion of the ABS proximate the reader
Data Source
AI summary
An apparatus comprises a slider comprising an air bearing surface (ABS). The slider comprises a reader, a writer, and a reader heater. The reader heater is configured to cause a protrusion of the ABS proximate the reader, and the reader heater comprises a first planar loop and a second planar loop, wherein the first and second loops are in the same plane.