Shaped Box Shield Write Pole for Magnetic Field Control
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Solution Overview
Problem
Magnetic elements face challenges in maintaining a strong magnetic field and gradient while conforming to high data bit density and reduced form factor in data storage devices, leading to issues like side track erasure and adjacent track interference due to inadequate shielding and shunting.
Innovation Solution
A magnetic element is configured with a write pole positioned within a box shield, separated by a tuned write gap that maintains a specific separation distance from the leading edge, preventing shunting and optimizing magnetic shielding to define a precise magnetic extent and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the write pole is positioned closer to the box shield to reduce size, then the form factor is reduced, but shunting occurs that degrades magnetic field and gradient
Solution Approach 1:
The write gap is configured with non-uniform thickness, being thinner at the leading edge and thicker at the trailing edge. This local variation in gap dimensions optimizes magnetic field distribution, providing sufficient separation to prevent shunting while maintaining compact overall dimensions.
Solution Approach 2:
The patent optimizes specific dimensional parameters of the write gap, including its thickness profile and separation distances from the box shield. By carefully controlling these parameters, the design achieves the optimal balance between compact form factor and adequate magnetic field strength.
2Productivity
If the magnetic element is reduced in size for high data bit density, then productivity increases, but side track erasure and adjacent track interference worsen
Solution Approach 1:
The box shield acts as an intermediary magnetic shielding structure that confines the magnetic field to the intended track. By positioning the write pole within the box shield and maintaining appropriate separation distances, the shield prevents magnetic flux from spreading to adjacent tracks, thereby eliminating side track erasure and interference.
Solution Approach 2:
The write pole is nested within the box shield structure, with the write gap providing the necessary separation. This nested configuration allows the compact magnetic element to maintain effective magnetic confinement, enabling high data bit density without compromising track isolation.
3Reliability
If shielding is increased to prevent interference, then reliability improves, but device complexity increases
Solution Approach 1:
The magnetic element is segmented into distinct functional components: the write pole, the box shield, and the write gap. This segmentation allows each component to be optimized independently for its specific function while maintaining overall simplicity. The box shield is further segmented into leading edge and trailing edge portions with different separation characteristics.
Solution Approach 2:
The box shield serves multiple functions simultaneously: it provides magnetic shielding to prevent adjacent track interference, defines the magnetic extent of the write pole, and contributes to the overall structural integrity of the compact magnetic element. This multi-functionality reduces the need for additional separate components.
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 enhances magnetic field and gradient, reducing side track erasure and adjacent track interference, thereby improving data storage accuracy and reliability in high-density data environments.
Implementation Method 1
The box shield may be configured to maintain at least a separation distance from a first side of a leading edge of the write pole to an opposite second side of the leading edge
Data Source
AI summary
A magnetic element may be generally configured as a data writer constructed at least with a write pole positioned within and separated from a box shield by a write gap. The box shield may be configured to maintain at least a separation distance from a first side of a leading edge of the write pole to an opposite second side of the leading edge.