Near-Field Transducer Stable Material Layer
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Solution Overview
Problem
The challenge in achieving higher recording densities in magnetic media drives is the deformation of near-field transducers (NFTs) due to high temperatures, which limits the effectiveness of heat-assisted magnetic recording (HAMR) technology as the NFTs are prone to deformation when heated for extended periods, especially near the point where the optical near-field is generated.
Innovation Solution
Incorporating a stable material with a wedge or triangular shape on the near-field transducer (NFT) at the media facing surface, which can be in contact with or spaced from a thermal shunt, to manage heat flow and reduce temperature gradients, thereby preventing deformation and enhancing the recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If gold is used for the NFT material to achieve high optical efficiency, then the optical efficiency is improved, but the NFT deforms due to low melting point when heated for long term
Solution Approach 1:
The patent uses a composite structure where the NFT is made of gold (for high optical efficiency) and is coupled with a stable material layer having higher thermal stability. This composite approach allows the gold NFT to maintain its optical performance while the stable material layer protects it from thermal deformation during prolonged heating operations.
2Quantity of substance
If the main pole surface area is decreased to achieve higher recording density, then the recording density is improved, but the recording field becomes smaller limiting the effectiveness
Solution Approach 1:
The patent applies local quality by concentrating the heating function at the NFT location rather than distributing it across the entire main pole. The stable material layer is specifically positioned at the MFS where the optical near-field is generated, providing localized thermal management where it is most needed to maintain small bit dimensions without requiring a larger overall pole area.
3Power
If the NFT is heated to generate optical near-field for HAMR, then the recording capability is improved, but the NFT temperature exceeds operational temperature causing deformation
Solution Approach 1:
The stable material layer acts as an intermediary between the gold NFT and the surrounding environment. It has higher thermal stability than gold, allowing it to withstand the high temperatures generated during HAMR operation while protecting the gold NFT from exceeding its melting point and deforming.
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 stable material design improves the lifetime of the NFT by reducing thermal gradients and maintaining the confinement of the optical near-field, ultimately increasing areal recording density and preventing NFT deformation.
Implementation Method 1
a stable material disposed on the NFT between the thermal shunt and the MFS... to manage heat flow and reduce temperature gradients
Implementation Method 2
a laser source exciting a near-field transducer (NFT) to produce heat at a write location of a magnetic recording medium
Data Source
AI summary
The present disclosure generally relates to a magnetic recording head for a magnetic media drive. The magnetic recording head comprises a main pole, a waveguide disposed adjacent to the main pole, a near field transducer (NFT) coupled between the main pole and the waveguide at a media facing surface (MFS), a thermal shunt disposed on the NFT, the thermal shunt being recessed from the MFS, and a stable material disposed on the NFT at the MFS. In some embodiments, the stable material is wedge-shaped or triangular-shaped. In another embodiment, the stable material comprises a first portion and a second portion, where the first and second portions may each by linear, or where the first portion is triangular-shaped and the second portion is square-shaped. The stable material may be in contact with the thermal shunt, or spaced from the thermal shunt.