HAMR Head Peg Coupler Plasmonic Pad E-Resonator
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Solution Overview
Problem
Current heat-assisted magnetic recording (HAMR) technologies face limitations in achieving high thermal gradients necessary for high-density recording due to the magnetic pole's light absorption, which reduces near-field transducer efficiency and thermal gradient, especially when the pole tip is close to the peg.
Innovation Solution
Incorporating a plasmonic metal pad and peg coupler, formed from materials like Ir, Rh, or Pt, which form an E-resonator with the near-field transducer, amplifies the electric field component normal to the peg, enhancing the down-track thermal gradient while maintaining cross-track thermal gradient, and the peg coupler covers the magnetic pole's bottom surface near its tip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the magnetic pole tip is positioned close to the near-field transducer peg to reduce device complexity, then the device structure is simplified, but the magnetic pole absorbs light which reduces the near-field transducer efficiency and down-track thermal gradient
Solution Approach 1:
A dielectric gap is introduced as an intermediary element between the magnetic pole tip and the near-field transducer peg. This gap allows the magnetic pole to be positioned close to the NFT for structural simplicity while preventing direct light absorption by the magnetic pole, thereby maintaining high down-track thermal gradient and NFT efficiency.
2Manufacturing precision
If the magnetic pole is positioned close to the near-field transducer to improve recording density, then high-density recording is enabled, but light absorption by the magnetic pole reduces thermal gradient efficiency
Solution Approach 1:
The dielectric gap serves as a mediator that enables close positioning of the magnetic pole for high-density recording while blocking direct light absorption, thus preserving thermal gradient efficiency and reducing energy loss.
Solution Approach 2:
The solution applies local quality by introducing the dielectric gap specifically in the region where light propagation occurs, allowing the magnetic pole to be close for high density recording while the gap locally prevents light absorption, maintaining thermal efficiency in the critical recording zone.
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 improves the down-track thermal gradient by 0.7-0.8 K/nm with minimal loss in cross-track thermal gradient, enhancing the efficiency of the near-field transducer and allowing for sharper magnetic transitions.
Implementation Method 1
Incorporating a plasmonic metal pad and peg coupler, formed from materials like Ir, Rh, or Pt, which form an E-resonator with the near-field transducer, amplifies the electric field component normal to the peg
Implementation Method 2
a near-field transducer positioned at or near a media-facing surface... amplifies the electric field component normal to the peg, enhancing the down-track thermal gradient
Data Source
AI summary
A write head includes a waveguide, a magnetic pole, and a near-field transducer. The near-field transducer includes an enlarged portion and a peg. The peg is separated from the magnetic pole in a downtrack direction by a dielectric gap. A peg coupler covers a bottom surface of the magnetic pole and is separated from the peg. The peg coupler is formed of a first plasmonic material. A pad extends from the peg coupler into part of the gap in the downtrack direction towards the peg. The pad is formed of a second plasmonic material and extends into the write head away from the media-facing surface a distance L that is less than a corresponding distance of the peg coupler.