Write Pole With Soft Cap Layer For Magnetic Recording Head
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In magnetic data storage systems, the challenge lies in achieving high mechanical stability of write poles with increased write pole wall angles while maintaining high writing efficiency, as smaller write pole dimensions limit the generation of large write fields and field gradients, and thicker poles result in mechanical instability and adjacent track interference.
Innovation Solution
A write pole structure is implemented with a write pole layer, a bottom layer having a beveled surface, and a cap layer made of a material softer than the write pole layer, which enhances mechanical stability and writing efficiency by optimizing the write pole wall angle and reducing the risk of mechanical instability during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If write pole wall angle is increased to improve mechanical stability, then mechanical stability is improved, but writing efficiency deteriorates
Solution Approach 1:
The patent applies different material properties to different regions of the write pole structure. The write pole layer uses a softer material to maintain mechanical stability and prevent breaking during manufacturing, while the cap layer uses a harder material to provide structural support and maintain the optimized wall angle geometry. This local differentiation allows the structure to simultaneously achieve mechanical stability and writing efficiency.
Solution Approach 2:
The write pole structure combines multiple materials with complementary properties: a softer ferromagnetic material for the write pole layer to ensure mechanical stability and prevent breaking, and a harder non-magnetic material for the cap layer to provide structural support. This composite structure enables the write pole to maintain its geometric integrity with optimized wall angle while achieving both mechanical stability and writing efficiency.
2Area of moving object
If write pole dimensions are reduced to increase areal density, then areal density is improved, but generation of write fields deteriorates
Solution Approach 1:
The patent optimizes the write pole wall angle parameter to achieve a balance between dimensional constraints and field generation capability. By carefully controlling the wall angle geometry and material properties, the structure maximizes write field generation within the limited space available at smaller dimensions, thereby improving areal density without sacrificing writing performance.
3Power
If thicker write pole paddle is used to generate larger write field, then write field generation is improved, but adjacent track interference increases
Solution Approach 1:
The patent uses different material properties locally to optimize the write pole structure. The softer write pole layer material allows for precise geometric control and reduced mechanical stress, enabling thinner pole paddles that generate sufficient write fields without causing excessive adjacent track interference, while the harder cap layer provides the necessary structural support.
Data Source
AI summary
A write pole structure disclosed herein includes a write pole layer, a bottom layer including a beveled surface, and a cap layer between the write pole layer and the bottom layer, wherein the cap layer is made of a material with hardness less than hardness of the write pole layer.