Magnetic Transducer Gap Segmentation for Throat Height Control
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Solution Overview
Problem
Conventional magnetic recording transducers in disk drives face challenges in optimizing the effective throat height of the writer pole, which affects the magnetic write field and recording efficiency.
Innovation Solution
The implementation of a magnetic recording transducer with a writer pole featuring two gap layers between the main pole and the trailing shield, where the first gap layer is in contact with the writer pole's trailing surface and the second gap layer is on a section of the bevel, reducing the effective throat height and enhancing the magnetic write field by allowing a thicker trailing shield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the effective throat height of the writer pole is reduced, then the magnetic write field and recording efficiency are improved, but the trailing shield thickness is constrained
Solution Approach 1:
The gap structure is segmented into two distinct gap layers: a first gap layer in contact with the writer pole trailing surface, and a second gap layer on a section of the bevel. This segmentation allows independent optimization of each gap layer's thickness and material properties, enabling the effective throat height to be reduced while maintaining adequate trailing shield thickness for proper shielding function.
Solution Approach 2:
Different sections of the gap structure are assigned different qualities through the two gap layers. The first gap layer provides a specific magnetic property profile near the pole, while the second gap layer on the bevel section provides a different profile further along the throat. This local differentiation allows the effective throat height to be shortened without compromising the overall magnetic field distribution and shield performance.
2Reliability
If a thicker trailing shield is used, then the magnetic shielding performance is improved, but the effective throat height increases
Solution Approach 1:
The gap structure extends along the bevel surface of the writer pole, utilizing the dimensional space created by the bevel geometry. By placing the second gap layer on a section of the bevel rather than directly extending the vertical gap, the design effectively uses the slanted dimensional space to accommodate the gap structure without increasing the vertical effective throat height, thereby allowing a thicker trailing shield.
Solution Approach 2:
The two gap layers act as intermediaries between the writer pole and the trailing shield. They provide the necessary magnetic circuit properties and field distribution control, allowing the trailing shield to be made thicker for improved shielding performance without directly increasing the effective throat height, as the gap layers mediate the magnetic field transitions.
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 magnetic write field and recording efficiency by reducing the effective throat height and enabling a thicker trailing shield, thereby enhancing data storage capabilities.
Implementation Method 1
The effective throat height of the writer main pole is reduced by the use two gap layers between the writer main pole and the trailing shield
Data Source
AI summary
A magnetic recording transducer for use in a data storage device includes a writer pole with a ABS surface, trailing edge bevel and a trailing shield. The effective throat height of the writer main pole is reduced by the use two gap layers between the writer main pole and the trailing shield. A first gap layer is on and in contact with the writer pole trailing surface, and a second gap layer is on a section of the first gap layer on the writer pole trailing edge bevel, from a point removed from the ABS surface and absent from a part on a section of the first gap layer on the writer pole trailing edge bevel nearest the ABS. A method of fabricating the transducer is also provided.