Dielectric Resonator for HAMR Near Field Transducer
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Solution Overview
Problem
In heat-assisted magnetic recording (HAMR), the proximity of the near-field transducer (NFT), magnetic write pole, and heat sink to the waveguide core leads to excessive absorption of electromagnetic radiation, degrading the coupling efficiency and reliability of the HAMR head due to heating and potential corrosion.
Innovation Solution
A dielectric resonator is inserted between the waveguide core and the NFT to increase the distance and reduce light absorption in the magnetic write pole and heat sink, enhancing the reliability of the HAMR head by efficiently transferring electromagnetic radiation to the NFT for surface plasmon generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NFT, magnetic write pole, and heat sink are positioned close to the waveguide core to improve coupling efficiency, then electromagnetic radiation absorption increases, but this degrades reliability due to heating and potential corrosion
Solution Approach 1:
A dielectric resonator is introduced as an intermediary component between the waveguide core and the NFT. This resonator transfers electromagnetic energy from the waveguide to the NFT through evanescent field coupling, reducing direct absorption by the NFT, magnetic pole, and heat sink while maintaining efficient energy transfer. The resonator acts as a mediator that decouples the conflicting requirements of proximity for coupling efficiency and distance for reduced absorption.
2Productivity
If the NFT is positioned close to the waveguide core to enhance surface plasmon generation, then coupling efficiency improves, but thermal stability deteriorates due to excessive heating
Solution Approach 1:
The dielectric resonator serves as a mediator that enables efficient surface plasmon generation in the NFT while maintaining thermal stability. By positioning the resonator between the waveguide core and NFT, the system achieves strong evanescent field coupling for effective plasmon excitation, while the resonator's dielectric properties and spatial separation prevent excessive heat accumulation in the NFT and surrounding components.
3Temperature
If the distance between the waveguide core and NFT is increased to reduce light absorption, then thermal stability improves, but coupling efficiency decreases
Solution Approach 1:
The dielectric resonator exploits resonant oscillation of electromagnetic fields at specific frequencies to enhance coupling between the waveguide core and NFT. By designing the resonator with appropriate dimensions and dielectric properties, the system achieves strong resonant coupling that maintains high energy transfer efficiency despite the increased physical distance between the waveguide core and NFT, thereby preserving coupling efficiency while improving thermal stability.
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
The dielectric resonator enhances the reliability of the HAMR head by reducing electromagnetic radiation absorption in the NFT, magnetic pole, and heat sink, thereby improving coupling efficiency and maintaining thermal stability for precise data storage.
Implementation Method 1
A dielectric resonator is inserted between the waveguide core and the NFT to increase the distance and reduce light absorption in the magnetic write pole and heat sink, enhancing the reliability of the HAMR head by efficiently transferring electromagnetic radiation to the NFT for surface plasmon generation.
Implementation Method 2
The electromagnetic radiation is converted to surface plasmons in the NFT.
Implementation Method 3
A dielectric resonator is inserted between the waveguide core and the NFT
Data Source
AI summary
An apparatus includes a near field transduce (NFT), a waveguide core, and a dielectric resonator. The waveguide core is configured to propagate electromagnetic radiation. The dielectric resonator is disposed between the waveguide core and the NFT and is configured to transfer energy of the electromagnetic radiation to the NFT.