HAMR Transducer Diffusion Barrier Layers
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Solution Overview
Problem
Conventional heat-assisted magnetic recording (HAMR) transducers face performance and reliability issues due to high temperatures affecting the near-field transducer, waveguide, and main pole, leading to degradation and reduced performance.
Innovation Solution
Incorporation of diffusion barrier layers between the near-field transducer and the main pole, as well as between the main pole and surrounding structures, to prevent material diffusion and corrosion, thereby maintaining component properties and enhancing transducer performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HAMR transducer structure is used, then light coupling and focusing function is achieved, but material diffusion and corrosion occur at high temperatures leading to performance degradation
Solution Approach 1:
A diffusion barrier layer comprising tungsten, ruthenium, or rhodium is introduced as an intermediary between the near-field transducer and the main pole. This barrier layer prevents direct contact and material diffusion between the two components while withstanding the high temperatures generated during HAMR operation, thereby maintaining transducer performance stability without interfering with the optical writing function.
2Object-affected harmful factors
If diffusion barrier layer is added, then material diffusion is prevented, but device structure becomes more complex
Solution Approach 1:
The diffusion barrier layer is applied selectively only in the regions where material diffusion occurs between the near-field transducer and the main pole, rather than coating the entire transducer structure. This localized application prevents material intermixing at critical interfaces while minimizing the addition of structural complexity and maintaining the overall simplicity of the HAMR transducer design.
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 diffusion barrier layers effectively reduce intermixing of materials, prevent corrosion, and enhance the performance and reliability of the HAMR transducer by isolating the main pole from diffusing materials, leading to improved thermal management and extended component lifespan.
Implementation Method 1
Incorporation of diffusion barrier layers between the near-field transducer and the main pole, as well as between the main pole and surrounding structures, to prevent material diffusion and corrosion
Implementation Method 2
Light from the laser is incident on and coupled into the waveguide. Light is guided by the conventional waveguide to the NFT near the ABS.
Implementation Method 3
The NFT focuses the light to magnetic recording media (not shown), such as a disk. This region is thus heated.
Implementation Method 4
The NFT focuses the light to magnetic recording media... This region is thus heated
Implementation Method 5
The main pole is energized and field from the pole tip is used to write to the heated portion of the recording media.
Data Source
AI summary
A heat assisted magnetic recording (HAMR) writer is described. The HAMR writer is coupled with a laser and has an air-bearing surface (ABS) that resides near a media during use. The HAMR writer includes a waveguide, a near-field transducer (NFT), a main pole, coil(s) and at least one of a first and a second diffusion barrier layer. The waveguide is optically coupled with the laser and directs energy from the laser toward the ABS. The NFT is optically coupled with the waveguide and focuses the energy onto a region of the media. The main pole writes to the region of the media. The main pole has a top, a bottom, and a plurality of sides. The first diffusion barrier layer is between at least the NFT and the bottom of the pole. The second diffusion barrier layer is adjacent to the plurality of sides of the main pole.