Write Pole Magnetic Guard With Tuned Saturation
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Solution Overview
Problem
In data storage systems, the reduced physical size and proximity of magnetic materials lead to increased magnetic volatility, compromising the accuracy and speed of data access and integrity, necessitating a solution for optimized magnetic stability and shielding.
Innovation Solution
A data writer design featuring a write pole with a side shield comprising a first magnetic layer on the air bearing surface and a guard layer separated by a non-magnetic layer, allowing for tuning of magnetic saturation flux density and position to optimize magnetic gradients and stability, thereby reducing magnetic shunting and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If magnetic materials are reduced in physical size and placed in closer proximity to increase data storage capacity, then data storage capacity is improved, but magnetic stability deteriorates leading to increased magnetic volatility
Solution Approach 1:
A non-magnetic spacer layer is introduced between the write pole and the magnetic guard layer to prevent direct magnetic interaction. This intermediary layer allows the guard layer to be positioned close to the write pole for effective shielding while preventing magnetic shunting and maintaining magnetic stability of the write pole
Solution Approach 2:
The magnetic guard layer is designed with different magnetic saturation flux density compared to the first magnetic layer, allowing optimization of magnetic gradients. By tuning the material properties and position of the guard layer, the system achieves improved magnetic stability while maintaining close proximity configuration
2Device complexity
If a single-layer magnetic shield is used to simplify the structure, then device complexity is reduced, but magnetic shielding effectiveness deteriorates due to magnetic saturation
Solution Approach 1:
The magnetic shield is divided into two distinct layers: a first magnetic layer positioned on the air bearing surface and a magnetic guard layer separated by a non-magnetic spacer. This segmentation allows each layer to perform optimized functions, preventing magnetic saturation and improving overall shielding effectiveness
Solution Approach 2:
The shield structure combines different magnetic materials with different saturation flux densities in a layered composite configuration. This composite structure enables the system to handle stronger magnetic fields without saturation, improving reliability while maintaining reasonable structural complexity
3Reliability
If the guard layer is positioned closer to the air bearing surface to improve magnetic shielding, then magnetic shielding effectiveness is improved, but magnetic shunting increases compromising data integrity
Solution Approach 1:
A non-magnetic spacer layer is positioned between the write pole and the magnetic guard layer to act as an intermediary that prevents magnetic shunting. This allows the guard layer to be positioned close to the air bearing surface for effective shielding while the non-magnetic material blocks direct magnetic flux paths that would cause shunting
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 data writing performance by providing stable magnetic shielding, reducing the risk of accidental data erasure and improving magnetic field gradients, thus maintaining data integrity and access speed.
Implementation Method 1
The guard layer is configured with a similar or dissimilar magnetic saturation flux density compared to the first magnetic layer
Implementation Method 2
tuning the material, size, and position of the guard layer... the shield can have optimized magnetic gradients that are magnetically stable
Data Source
AI summary
A data storage system may have at least one data writer that incorporates a write pole that continuously extends from an air bearing surface. The write pole can be separated from the air bearing surface by a side shield that consists of a first magnetic layer positioned on the air bearing surface and a guard layer separated from the air bearing surface by the first magnetic layer. The guard layer may be configured with a different magnetic saturation flux density than the first magnetic layer.