Segmented Write Gap Structure for Magnetic Recording Head
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Solution Overview
Problem
Current magnetic recording heads face challenges in achieving higher field gradients for increased storage density due to limitations in write gap width, which can lead to reduced performance from flux leakage and field strength degradation.
Innovation Solution
A write gap structure with multiple segments is introduced, featuring a narrow write gap width of less than 25 nanometers proximate to the air bearing surface and a larger gap width behind it, formed by a beveled pole tip and front shield configuration, to enhance field gradients and reduce flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the write gap width is reduced to enhance field gradient for higher density recording, then storage density is improved, but flux leakage increases and field strength degrades
Solution Approach 1:
The write gap is divided into multiple segments along the beveled pole tip surface, with each segment having a different gap width. The proximal segment has a narrow gap width (less than 25 nm) to enhance field gradient for high density recording, while the distal segment has a larger gap width to reduce flux leakage and maintain field strength. This segmentation allows simultaneous optimization of both storage density and field strength.
Solution Approach 2:
Different regions of the write gap are assigned different gap widths based on their functional requirements. The proximal region (near the air bearing surface) has a narrow gap for high field gradient, while the distal region (behind the pole tip) has a wider gap for flux containment. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Measurement precision
If a narrow write gap width is used proximate to the air bearing surface, then field gradient is enhanced, but manufacturing complexity increases
Solution Approach 1:
The write gap structure is segmented into multiple sections with different dimensions. The proximal segment provides the narrow gap width (less than 25 nm) for enhanced field gradient, while the distal segment has a larger gap width. This segmentation is achieved through selective etching processes that create the multi-level gap structure, balancing performance requirements with manufacturing capabilities.
Solution Approach 2:
The write gap structure extends in the depth direction (away from the air bearing surface) with varying gap widths. By utilizing the third dimension (depth), the patent creates a multi-level gap structure that provides both narrow and wide gap regions, resolving the contradiction between field gradient enhancement and manufacturing complexity through spatial differentiation.
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 enables higher data storage density while maintaining strong write field strength by optimizing the write gap structure with multiple segments, specifically a proximal and distal gap segment design, to balance field gradient and flux leakage.
Implementation Method 1
Inductive write elements include a main pole and pole tip and one or more return poles. Current is supplied to write coils to induce a flux path in the main pole to record data on one or more magnetic storage layers of the media.
Data Source
AI summary
The present application relates to a write gap structure for a magnetic recording head. In illustrated embodiments, the write gap structure includes multiple write gap segments along a beveled pole tip surface between a top edge and a bottom edge of the beveled pole tip surface to provide a narrow write gap proximate to the air bearing surface and a larger write gap behind the air bearing surface. In illustrated embodiments, the narrow write gap segment is formed between the beveled pole tip surface and a lower back surface of front shield and the larger write gap is formed between the beveled pole tip surface and an upper back surface of the front shield.