TAMR Slider ABS Design with Multiple Heaters for Dynamic Stability
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Solution Overview
Problem
Current thin film magnetic read/write heads with dynamic flying height (DFH) and thermally assisted magnetic recording (TAMR) face challenges in achieving dynamic stability, thermal management, uniform touch-down detection, and wear resistance, particularly due to the high pressure/stiffness air-bearing surface designs that compromise slider stability and induce wear during extended operation.
Innovation Solution
The design incorporates multiple heaters laterally disposed relative to the read/write head within a slider with an extremely low pressure/stiffness air-bearing surface topography, enhancing dynamic stability and wear resistance while maintaining low pressure/stiffness for improved touch-down detection and back-off efficiency, as shown in FIG. 3, with the heaters providing controlled slider surface protrusions for enhanced stability across the disk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high pressure/stiffness air-bearing surface design is used, then thermal management is improved, but dynamic stability deteriorates and wear increases
Solution Approach 1:
The air-bearing surface is segmented into multiple functional zones with different pressure characteristics. The write zone maintains high pressure for thermal management, while the read zone and other areas maintain low pressure for stability. This spatial segmentation allows simultaneous optimization of thermal management and dynamic stability.
Solution Approach 2:
Different regions of the air-bearing surface are given different pressure/stiffness characteristics tailored to their specific functions. The write zone has high pressure/stiffness for thermal conduction, while the read zone has low pressure/stiffness for stability. This local differentiation resolves the contradiction between thermal management and dynamic stability.
2Temperature
If high pressure/stiffness air-bearing surface design is used, then thermal management is improved, but wear and damage resistance deteriorates
Solution Approach 1:
The air-bearing surface is divided into functional zones where the write zone experiences high pressure for thermal management, while the read zone and other areas experience low pressure that reduces mechanical wear and damage. This segmentation protects the slider from wear while maintaining thermal management capabilities.
Solution Approach 2:
The air-bearing surface has non-uniform pressure distribution where high pressure is localized only where needed for thermal conduction, while low pressure prevails in other regions to minimize wear. This local quality differentiation achieves both thermal management and wear resistance.
3Measurement precision
If low pressure/stiffness air-bearing surface design is used, then touch-down detection is improved, but dynamic stability deteriorates
Solution Approach 1:
The air-bearing surface is segmented such that the read zone maintains low pressure/stiffness for excellent touch-down detection, while the write zone maintains high pressure for thermal management and dynamic stability. This spatial segmentation allows each zone to optimize for its specific function without compromising the other.
Solution Approach 2:
Different regions of the air-bearing surface are assigned different pressure characteristics: the read zone has low pressure for sensitivity, while the write zone has high pressure for stability. This local differentiation enables simultaneous optimization of touch-down detection and dynamic stability.
4Stability of the object's composition
If multiple heaters are added laterally, then dynamic stability is improved, but device complexity increases
Solution Approach 1:
The heating function is segmented into multiple independent heater elements distributed laterally across the air-bearing surface. Each heater can be independently controlled to provide localized thermal assistance, improving dynamic stability while the modular segmentation keeps the complexity manageable through standardized 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 configuration achieves improved dynamic stability, reduced wear, and enhanced thermal management, allowing for efficient thermal energy distribution and maintaining low pressure/stiffness, thus addressing the limitations of existing designs by providing a stable and durable slider for TAMR operations.
Implementation Method 1
applies thermally assisted magnetic recording (TAMR) to improve the writeability of that magnetic medium by locally heating (i.e., supplying thermal energy to) the region on which writing is to occur
Implementation Method 2
an air bearing surface (ABS) design for a slider that facilitates the management of that TAMR thermal energy
Implementation Method 3
utilizes DFH (dynamic fly height) to control the distance between a read/write transducer and a magnetic medium
Data Source
AI summary
A TAMR (thermal assisted magnetic recording) equipped DFH (dynamic flying height) type slider ABS design, when operating in a HDD (hard disk drive) produces exceptional low pressure/stiffness for improved touch down detection and back-off efficiency as well as wear and damage reduction due to the improved capabilities as well as reduction in heat transfers. The supplementation of the slider with multiple heaters, three herein, disposed about the write-head in the cross-track direction provides the slider with enhanced dynamic stability that would normally not be achievable with the exceptional low pressure/stiffness.