Magnetic Writer Shield Saturation Gradient
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Solution Overview
Problem
Conventional magnetic recording heads face challenges in achieving high recording densities due to flux leakage and degradation in performance, particularly with mismatched saturation magnetizations in side and trailing shields, leading to issues like wide area track erasure and shunting of flux, which affect writing quality and areal density recording.
Innovation Solution
Implementing side shields with a gradient in saturation magnetization, where the magnetization increases in the yoke direction, reducing flux shunting and improving field gradients, and configuring leading and trailing shields similarly to enhance recording performance, particularly for shingle recording schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic recording heads use uniform saturation magnetization in shields, then manufacturing is simple, but flux leakage and wide area track erasure occur at higher recording densities
Solution Approach 1:
The side shields are configured with a gradient in saturation magnetization along the track direction, where the saturation magnetization varies from a first value at the leading end to a second value at the trailing end. This local variation in magnetic properties optimizes flux containment and field gradient at different positions, resolving the contradiction between simple uniform structure and complex high-performance structure.
Solution Approach 2:
The saturation magnetization parameter of the side shields is changed continuously along the track direction to create a gradient profile. This parameter change enables the shields to adapt to different flux distribution requirements at different positions, improving recording performance without requiring multiple discrete shield components.
2Reliability
If side shields have high saturation magnetization to contain flux, then flux shunting is reduced, but wide area track erasure occurs due to mismatched magnetization with trailing shield
Solution Approach 1:
The gradient in saturation magnetization creates different magnetic properties at different locations within the side shields. The trailing end has lower saturation magnetization that better matches the trailing shield, preventing flux leakage and wide area track erasure, while the leading end maintains higher saturation magnetization for effective flux containment during writing.
Solution Approach 2:
The gradient structure converts what would normally be a harmful mismatch between side shield and trailing shield magnetization into a beneficial feature. The gradual transition in saturation magnetization allows for controlled flux distribution that prevents both flux shunting and wide area track erasure simultaneously.
3Ease of manufacture
If conventional heads use conformal side shields with constant gap thickness, then manufacturing is easy, but performance degrades at higher areal densities
Solution Approach 1:
While maintaining the overall conformal structure for ease of manufacture, the side shields incorporate a gradient in saturation magnetization that creates local variations in magnetic properties. This allows the shields to be manufactured using standard conformal deposition techniques while achieving enhanced performance at higher areal densities through the magnetic property gradient.
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
The gradient in saturation magnetization of side shields reduces flux shunting and improves field gradients, addressing issues like wide area track erasure and enhancing the overall performance of magnetic recording heads, especially at higher areal densities.
Implementation Method 1
the gradient in saturation magnetization of side shields reduces flux shunting and improves field gradients
Implementation Method 2
side shields with a gradient in saturation magnetization, where the magnetization increases in the yoke direction
Data Source
AI summary
A method and system provide a magnetic transducer. The transducer includes a main pole, a side gap, at least one coil and at least one of a leading shield, a trailing shield and side shield(s). A portion of the main pole resides at the ABS. The coil(s) are configured to energize the main pole. The side gap is being between the main pole and the at least one side shield. At least one of the leading shield, the side shield(s) and the trailing shield has a gradient in a saturation magnetization (Bs) such that the saturation magnetization increases in a yoke direction perpendicular to the ABS.