Tapered Magnetic Write Pole with Non-Magnetic 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, especially as areal density increases, where existing shields become ineffective 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 shield and the pole, improving magnetic flux concentration and reducing the likelihood of adjacent track alteration during writing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing shields are used to minimize magnetic flux leakage and fringing, then side writing and side erasure are reduced, but as areal density increases, the shields become ineffective and magnetic flux leakage worsens
Solution Approach 1:
The write pole is designed with different geometries at different locations: a tapered region near the air bearing surface that flares outward, and a pole tip region that is narrower. This local variation in geometry optimizes magnetic flux distribution - the tapered region concentrates flux to reduce leakage while the pole tip region maintains effective writing capability, thereby resolving the contradiction between reducing side effects and maintaining writing effectiveness at high areal densities
Solution Approach 2:
The invention adds a dimensional aspect to the write pole by creating a three-dimensional flared structure with specific taper angles and dimensions. This dimensional change allows the magnetic flux to be controlled more effectively in space, concentrating the flux where needed and reducing fringing effects, thus improving shield effectiveness at higher areal densities
2Reliability
If the write pole geometry is modified to concentrate magnetic flux, then magnetic flux concentration improves, but manufacturing complexity increases due to multiple tapered regions and layer patterning
Solution Approach 1:
The write pole structure is segmented into distinct regions (tapered region and pole tip region) with different geometries, and the fabrication process is segmented into multiple patterning and etching steps. Each segment serves a specific function: the tapered region for flux concentration and the pole tip region for effective writing. This segmentation allows optimization of each region's performance while managing overall complexity through systematic fabrication procedures
3Object-affected harmful factors
If the separation distance between shield and pole is increased, then magnetic flux leakage is reduced, but the magnetic field strength for writing decreases
Solution Approach 1:
The write pole employs local geometry variations with a tapered region that flares outward to increase separation from the shield in certain areas, reducing magnetic flux leakage locally. Simultaneously, the pole tip region maintains a narrower profile to preserve magnetic field strength for effective writing. This local differentiation resolves the contradiction between reducing flux leakage and maintaining writing field strength
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 enhance the magnetic write head's performance by concentrating magnetic flux and reducing bit error rates, effectively addressing side writing and erasure issues while maintaining high areal density.
Implementation Method 1
The tapered magnetic poles and front bump layer enhance the magnetic write head's performance by concentrating magnetic flux
Implementation Method 2
which increases the separation distance between the shield and the pole, improving magnetic flux concentration and reducing the likelihood of adjacent track alteration during writing operations
Data Source
AI summary
Methods for fabrication of tapered magnetic poles with a non-magnetic front bump layer. A magnetic pole may have a plurality of tapered surfaces 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 one or more of the tapered surfaces of the magnetic pole at a distance 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.