Tapered Magnetic Write Pole With Non-Magnetic Front Bump Layer
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Solution Overview
Problem
Magnetic write heads face challenges with side writing and side erasure due to magnetic flux leakage and fringing, which become more pronounced as areal density increases, limiting the effectiveness of existing shields in minimizing these issues.
Innovation Solution
The fabrication of magnetic write heads with tapered magnetic poles and a non-magnetic front bump layer, which increases the separation distance between the write pole and the shield, thereby improving the magnetic performance by concentrating the magnetic field and reducing bit error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing shields are used to minimize magnetic flux leakage, then side writing and side erasure are reduced, but as areal density increases, the shields become less effective and magnetic flux leakage worsens
Solution Approach 1:
The patent applies local quality by creating a tapered write pole with varying thickness - thinner at the air-bearing surface (ABS) end and thicker at the rear end. This non-uniform structure concentrates magnetic flux at the ABS where it is most needed for high-density recording, while the gradually increasing thickness toward the rear provides structural support and flux return path without causing excessive fringing fields. This localized variation in pole geometry optimizes the magnetic field distribution to reduce both side writing and side erasure effects.
Solution Approach 2:
The invention introduces a dimensional change by transitioning from a conventional uniform-thickness write pole to a three-dimensional tapered structure. The pole thickness varies continuously along its length, creating a gradient that modifies the magnetic flux distribution in the vertical dimension. This dimensional transformation allows the pole to concentrate flux at the ABS interface while providing a gradual transition that reduces fringing effects, thereby improving writing accuracy at high areal densities.
2Manufacturing precision
If the write pole thickness is reduced to concentrate magnetic field, then magnetic flux density improves, but the write pole becomes more susceptible to saturation and manufacturing difficulties
Solution Approach 1:
The patent implements parameter changes by systematically varying the write pole thickness parameter along its length. The thickness transitions from a minimum value at the ABS end to a maximum value at the rear end, creating an optimized gradient profile. This continuous parameter variation allows precise control of magnetic flux density at the recording interface while maintaining sufficient pole volume throughout the structure to prevent saturation and ensure manufacturing feasibility.
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 tapered magnetic poles and front bump layer design enhances the magnetic flux density while preventing shield saturation, leading to improved writing accuracy and reduced bit error rates, effectively addressing the limitations of existing shields in high-density recording.
Implementation Method 1
The tapered magnetic poles and front bump layer design enhances the magnetic flux density while preventing shield saturation
Implementation Method 2
The fabrication of magnetic write heads with tapered magnetic poles and a non-magnetic front bump layer, which increases the separation distance between the write pole and the shield, thereby improving the magnetic performance by concentrating the magnetic field and reducing bit error rates
Data Source
AI summary
Methods for fabrication of tapered magnetic poles with a non-magnetic front bump layer. A magnetic pole may have a tapered surface at or near an air bearing surface (ABS), wherein a thickness of the write pole increases in a direction away from the ABS. A non-magnetic front bump layer may be formed on the tapered surface of the magnetic pole and away from the ABS. The front bump layer may increase the separation distance between a shield layer and the magnetic pole near the tapered surface, thereby improving the performance of the write head.