Magnetic Recording Head Trailing Shield Varying Throat Heights
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Solution Overview
Problem
Magnetic recording heads with existing shield designs suffer from increased areal density and reliability issues due to spill-over magnetic fields, leading to adjacent-track-interference (ATI), wrong-track-interference (WTI), near-track-interference (NTI), and far-track-interference (FTI).
Innovation Solution
A magnetic recording head with a trailing shield having varying throat heights in the cross-track direction, where the central portion has a first throat height that is either less than or greater than the outer portions, enhancing writing capability and reducing interference by tapering the shield along the recessed edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the trailing shield is made with uniform throat height to simplify manufacturing, then manufacturing precision is improved, but writing capability and XTI performance deteriorate
Solution Approach 1:
The trailing shield is designed with non-uniform throat heights where the central portion adjacent to the main pole has a first throat height and the outer portions have a second throat height that is greater than the first. This local variation optimizes the magnetic field distribution to improve writing capability and reduce track interference while maintaining manufacturing feasibility through defined geometric parameters.
2Strength
If the trailing shield throat height is increased to improve writing capability, then writing strength is improved, but magnetic field spill-over increases causing track interference
Solution Approach 1:
The trailing shield employs different throat heights in different regions: a smaller first throat height in the central portion to contain the magnetic field and prevent spill-over, and a larger second throat height in the outer portions to provide adequate shielding. This spatial differentiation resolves the contradiction between writing strength and field containment.
Solution Approach 2:
The trailing shield is segmented into a central portion and outer portions with distinct throat height characteristics. This segmentation allows each region to perform its specific function optimally - the central portion focuses on field containment for writing accuracy, while the outer portions provide extended shielding coverage.
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 solution strengthens the writing capability of the magnetic recording head while minimizing spill-over magnetic erasures, thereby improving the overall performance and reliability by optimizing the throat heights of the trailing shield.
Implementation Method 1
The trailing shield having varying throat heights in the cross-track direction strengthens the writing capability or improves the XTI of the magnetic recording head
Data Source
AI summary
The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole and a trailing shield disposed adjacent to the main pole. A recessed edge of the trailing shield has throat heights varying in the cross-track direction. In one embodiment, the central portion of the trailing shield has a first throat height greater than a second throat height of outer portions of the trailing shield. The trailing shield having varying throat heights in the cross-track direction strengthens the writing capability or improves the XTI of the magnetic recording head.