Tapered Write Pole With Leading Edge Shield For Flux Control
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Solution Overview
Problem
Perpendicular magnetic recording systems face challenges with side writing and side erasure due to magnetic flux leakage and fringing, limiting the achievement of higher recording area densities.
Innovation Solution
The development of magnetic write heads with leading edge shields and tapered structures, including a write pole with a tapered leading edge and trailing edge, along with a trailing edge shield, to focus and control the magnetic flux, preventing leakage and enhancing field gradient and switching speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional write head design is used, then the structure is simple, but side writing and side erasure occur due to magnetic flux leakage
Solution Approach 1:
The write head is segmented into multiple functional components: a write pole with tapered leading and trailing edges, a leading edge shield positioned ahead of the write pole, and a trailing edge shield positioned behind the write pole. This segmentation allows each component to perform a specific function in controlling magnetic flux, preventing leakage, and reducing side writing/erasure effects.
Solution Approach 2:
Nonmagnetic spacer layers are introduced as intermediary elements between the write pole and the leading/trailing edge shields. These spacer layers provide magnetic isolation and prevent unwanted magnetic coupling, allowing the shields to effectively control flux leakage without directly contacting the write pole.
2Force
If the write pole cross section is reduced for perpendicular recording, then field concentration is improved, but manufacturing precision requirements increase
Solution Approach 1:
The write pole is designed with a tapered cross-section where the dimensions change gradually from the leading edge to the trailing edge. This parameter change approach allows the pole to maintain a small effective area for field concentration while providing larger dimensional margins at the edges, reducing manufacturing precision requirements.
Solution Approach 2:
Different sections of the write pole have different cross-sectional dimensions optimized for their specific functions: the leading edge has a smaller cross-section for field concentration and perpendicular recording, while the trailing edge has a larger cross-section for mechanical stability and flux return.
3Quantity of substance
If recording area density is increased, then data capacity is improved, but side writing and side erasure become more severe
Solution Approach 1:
The harmful magnetic flux leakage that causes side writing and side erasure is extracted and redirected by the leading and trailing edge shields. These shields capture the straying flux lines and guide them back through the intended magnetic path, preventing them from interfering with adjacent tracks.
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 design effectively minimizes side writing and erasure, allowing for increased recording area density by optimizing the magnetic field distribution and gradient, thereby improving data recording efficiency.
Implementation Method 1
A strong, highly concentrated magnetic field emits from the write pole in a direction perpendicular to the magnetic disk surface, magnetizing the magnetically hard top layer
Implementation Method 2
The resulting magnetic flux then travels through the soft underlayer, returning to the return pole
Data Source
AI summary
Methods for fabrication of leading edge shields and tapered magnetic poles with a tapered leading edge are provided. The leading edge shield may be formed by utilizing a CMP stop layer. The CMP stop layer may aid in preventing over polishing of the magnetic material. For the tapered magnetic poles with a tapered leading edge, a magnetic material is deposited on a planarized surface, a patterned resist material is formed, and exposed magnetic material is etched to form at least one tapered surface of the magnetic material.