Write Pole Sidewall Angles for Data Storage Density
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Solution Overview
Problem
In data storage systems, reducing the non-magnetic gap between the write pole and side shields to increase data bit areal density leads to magnetic flux leakage, compromising writeability and on-track recording density due to the shape of the write pole distal to the air bearing surface.
Innovation Solution
The write pole is designed with multiple sidewall sections at varying angles relative to the air bearing surface, optimizing the balance between magnetic flux delivery and leakage prevention by configuring the sidewall angles to maintain high write field amplitude and gradient without increasing the risk of flux leakage to adjacent shields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the non-magnetic gap between the write pole and side shields is reduced to increase data bit areal density, then data bit areal density is improved, but magnetic flux leakage increases compromising writeability and on-track recording density
Solution Approach 1:
The write pole is configured with non-uniform sidewall angles where the distal portion (farther from air bearing surface) has a smaller sidewall angle than the proximal portion. This local variation in geometry optimizes magnetic flux distribution at different locations, allowing the pole to maintain strong write fields while reducing flux leakage to side shields, thereby resolving the contradiction between increasing areal density and preventing flux leakage.
2Object-generated harmful factors
If the write pole geometry is modified to prevent magnetic flux leakage, then flux leakage is reduced, but write field amplitude and gradient may be compromised
Solution Approach 1:
The write pole sidewall is segmented into at least two distinct portions: a proximal portion and a distal portion, each with different sidewall angles. The proximal portion maintains a larger angle to preserve write field strength near the air bearing surface, while the distal portion uses a smaller angle to redirect magnetic flux away from side shields, thus preventing flux leakage without sacrificing write field performance.
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 results in a significant increase in write field performance metrics, such as maximum write field, write field gradient, and curvature, enhancing data bit areal density and writeability while minimizing flux leakage, thereby optimizing data writing performance.
Implementation Method 1
magnetic flux leakage, compromising writeability and on-track recording density due to the shape of the write pole distal to the air bearing surface
Data Source
AI summary
A data writer may be configured with a write pole that has one or more sidewalls continuously extending from an air bearing surface. A write pole sidewall can have a plurality of different wall angles. A portion of a write pole sidewall contacting the air bearing surface can have a first wall angle with respect to a trailing edge of the write pole, parallel to the air bearing surface. A second portion of the write pole sidewall can be half or less of the first wall angle. A third portion of the write pole sidewall can be smaller than the second wall angle.