Recessed HAMR Transducer Pole for Magnetic Field Alignment
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Solution Overview
Problem
The integration of magnetic and optical components in conventional heat-assisted magnetic recording (HAMR) transducers is challenging, leading to performance issues due to misalignment of the magnetic field with respect to the air-bearing surface, affecting the recording media.
Innovation Solution
The HAMR transducer design includes a recessed main pole and auxiliary poles, with the main pole positioned to minimize interference between optical and magnetic components, allowing for a more perpendicular magnetic field orientation and improved alignment, enhancing both optical and magnetic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pole design is used in HAMR transducer, then the structure is simple, but the magnetic field orientation is misaligned with the air-bearing surface
Solution Approach 1:
The pole is recessed into the slider substrate, transitioning from a surface-level component to a three-dimensional structure embedded within the substrate. This dimensional change allows the pole to be positioned at an optimal depth where the magnetic field achieves the desired perpendicular orientation to the air-bearing surface, resolving the alignment issue without complicating the overall device architecture
2Reliability
If the pole is positioned close to the air-bearing surface, then the magnetic field strength at the media is maximized, but optical components experience interference
Solution Approach 1:
The recessed pole structure acts as an intermediary solution, positioning the magnetic source at an intermediate depth between the optical components and the recording media. This intermediate positioning allows the magnetic field to reach the media with sufficient strength while being spatially separated from the optical components, thereby reducing optical interference and improving overall system reliability
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 design improves the performance and reliability of the HAMR transducer by reducing optical component interference and achieving a more desirable magnetic field orientation, leading to enhanced writing capabilities and higher density bit recording.
Implementation Method 1
Light from a laser is incident on and coupled into the waveguide 12. Light is guided by the conventional waveguide 12 to the NFT 20 near the ABS.
Implementation Method 2
The NFT 20 focuses the light to magnetic recording media (not shown), such as a disk. This region is thus heated.
Implementation Method 3
The NFT 20 focuses the light to magnetic recording media (not shown), such as a disk. This region is thus heated.
Implementation Method 4
The write pole 30 is energized and field from the pole tip 32 is used to write to the heated portion of the recording media.
Data Source
AI summary
A heat assisted magnetic recording (HAMR) write transducer has an air-bearing surface (ABS) configured to reside in proximity to a media during use and is coupled with a laser that provides energy. The HAMR transducer includes a main pole, at least one additional pole adjacent to the main pole in a down track direction, a waveguide and at least one coil for energizing the main pole. The main pole is configured to write to a region of the media and is recessed from the ABS by a first distance. The additional pole(s) are recessed from the ABS by a second distance greater than the first distance. The waveguide is optically coupled with the laser and directs a portion of the energy toward the ABS at an acute angle from the ABS. A portion of the waveguide resides between the additional pole(s) and the ABS.