Flared Peg Near-Field Transducer Thermal Resistance
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Solution Overview
Problem
Heat buildup in near-field transducers used in heat-assisted magnetic recording (HAMR) devices poses a challenge, leading to increased thermal resistance and potential reliability issues, which affects the performance and longevity of the recording heads.
Innovation Solution
The design incorporates a plasmonic near-field transducer with a flared region acting as a heat sink, reducing thermal resistance by increasing the cross-sectional area and minimizing the length of the peg region, thereby lowering the temperature of the transducer without compromising coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the peg region length is reduced to lower thermal resistance, then heat dissipation improves, but coupling efficiency may deteriorate
Solution Approach 1:
The patent applies local quality by creating a flared region with varying cross-sectional area along the peg structure. The flare angle is optimized to balance thermal conduction (wider base for heat dissipation) with optical coupling (narrower tip for focused near-field radiation). This local geometric variation allows simultaneous optimization of thermal and optical performance without compromising either function.
2Temperature
If the flared region cross-sectional area is increased to act as heat sink, then thermal resistance decreases, but device complexity increases
Solution Approach 1:
The transducer is segmented into distinct functional regions: an enlarged input end region for light coupling, a flared intermediate region for thermal management, and a narrow output end for near-field radiation. This segmentation allows each region to be optimized independently - the flared region provides heat sinking while maintaining a compact overall footprint, avoiding the need for complex external heat dissipation structures.
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 approach effectively reduces the temperature increase within the peg region by 5% to 23% while maintaining or improving coupling efficiency, addressing the reliability issues and heat dissipation challenges in HAMR devices.
Implementation Method 1
The flared region can act as a heat sink and can lower the thermal resistance of the peg region of the near-field transducer, thus reducing its temperature
Implementation Method 2
delivering a surface plasmon-enhanced near-field radiation pattern proximate the output end of the plasmonic transducer in response to receiving the light
Data Source
AI summary
Disclosed are plasmonic near-field transducers that are useful in heat-assisted magnetic recording. The disclosed plasmonic near-field transducers have an enlarged region and a flared region. In some embodiments the disclosed plasmonic near-field transducer can also include a peg region. The flared region can act as a heat sink and can lower the thermal resistance of the peg region of the near-field transducer, thus reducing its temperature. Also disclosed are methods that include delivering light to a magnetic transducer region via a waveguide, receiving the light at a plasmonic near-field transducer having an output end and disposed in proximity to the magnetic transducer region, and delivering a surface plasmon-enhanced near-field radiation pattern proximate the output end of the plasmonic transducer in response to receiving the light.