Flux Density Insert in Data Writer Side Shield
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Solution Overview
Problem
In reduced form factor data storage devices, magnetic shielding issues such as shunting and domain wall movement degrade the performance of transducing components, and existing shielding configurations fail to optimize magnetic performance while minimizing physical size, leading to data erasure challenges.
Innovation Solution
A magnetic element with a write pole positioned adjacent to and separated from side and trailing shields, where the side shield has a trailing box region partially filled with a flux density insert of a different material, optimizing the write field and shielding by tuning the magnetic extents and containing magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic shielding is enhanced to prevent shunting and domain wall movement, then magnetic performance is improved, but device complexity increases
Solution Approach 1:
The side shield is divided into multiple regions: a first region formed of a first magnetic material and a second region (trailing box region) formed of a second magnetic material with different magnetic properties. This segmentation allows each region to perform specialized functions - the first region provides primary shielding while the second region optimizes flux containment, thereby improving overall magnetic performance without requiring a completely complex shielding structure
Solution Approach 2:
Different regions of the side shield are assigned different magnetic materials with specific properties tailored to local requirements. The trailing box region uses a second magnetic material that differs from the first material to locally optimize flux density and containment in the critical trailing region, while other regions maintain their original shielding function. This local optimization improves magnetic performance without uniformly increasing device complexity
2Volume of moving object
If the physical size of transducing components is reduced, then form factor is improved, but magnetic shielding effectiveness deteriorates
Solution Approach 1:
The trailing box region is nested within the side shield structure, with the second magnetic material positioned in the trailing box region that is formed of the first magnetic material. This nested configuration allows the smaller device to maintain effective shielding by concentrating magnetic flux containment in the critical trailing region where it is most needed, achieving good shielding effectiveness in a reduced form factor
Solution Approach 2:
In the reduced form factor device, the second magnetic material is strategically placed in the trailing box region to locally enhance flux containment where space is most constrained. This localized material optimization ensures shielding effectiveness is maintained in the compact configuration without requiring uniform increases in overall component size
3Manufacturing precision
If trailing box region is filled with flux density insert, then write field gradient is optimized, but manufacturing complexity increases
Solution Approach 1:
The side shield is fabricated in segments during the deposition process - the first magnetic material is deposited to form the primary shield structure, then the trailing box region is defined and filled with the second magnetic material. This segmented fabrication approach enables precise control of the write field gradient through the trailing box region while using standard deposition techniques, avoiding the need for complex post-fabrication assembly
Solution Approach 2:
The trailing box region is defined and prepared during the deposition process itself, with the second magnetic material being deposited in the predetermined trailing box region before final shield formation is completed. This preliminary positioning of the flux density insert ensures optimal write field gradient is achieved from the outset, eliminating the need for complex subsequent manufacturing steps
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 shielding, reduces erasure conditions, and maintains high magnetic fields, allowing for precise data bit access without inadvertently affecting adjacent tracks, thus optimizing the performance of transducing components in data storage devices.
Implementation Method 1
The flux density insert and trailing box region may be tuned to define diverse write pole magnetic extents and contain magnetic flux within the predetermined magnetic extent
Implementation Method 2
The positioning of the flux density insert downtrack and along the trailing edge of the write pole can optimize write field and write field gradient
Data Source
AI summary
A data writer may be generally configured at least with a write pole adjacent to and separated from a side shield and a trailing shield. The side shield may be formed of a first material and configured with a trailing box region that is at least partially filled with a flux density insert formed of a second material that is different than the first material.