Laminated Side Shields for Perpendicular Write Heads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Perpendicular magnetic recording technologies face challenges in achieving high recording densities due to side shields causing erasure, as they can interfere with the magnetic field and lead to data loss.
Innovation Solution
The development of perpendicular write heads with laminated side shields composed of alternating magnetic and non-magnetic layers, which are engineered to minimize or eliminate proximal and distal erasure by optimizing magnetic properties and reducing flux leakage through careful layer thickness and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If side shields are used in perpendicular write heads, then shielding effectiveness is improved, but erasure occurs due to magnetic field interference
Solution Approach 1:
The side shield is divided into multiple alternating magnetic and non-magnetic layers, creating a segmented structure. This segmentation allows the shield to provide magnetic shielding effectiveness while the non-magnetic layers prevent flux leakage that causes erasure, thus resolving the contradiction between shielding effectiveness and erasure prevention.
Solution Approach 2:
The side shield uses a composite structure of alternating magnetic and non-magnetic materials. The magnetic layers provide shielding effectiveness, while the non-magnetic layers interrupt flux paths to prevent erasure. This composite material approach allows simultaneous achievement of both shielding effectiveness and erasure prevention.
2Object-affected harmful factors
If side shields are designed to provide strong magnetic shielding, then shielding performance is improved, but flux leakage increases causing erasure
Solution Approach 1:
The side shield structure segments the magnetic shielding function across multiple alternating layers. The non-magnetic layers act as barriers that segment and redirect flux paths, preventing excessive flux leakage while maintaining overall shielding performance.
Solution Approach 2:
Different regions of the side shield have different magnetic properties - magnetic layers provide shielding while non-magnetic layers provide flux containment. This local differentiation of material properties allows the structure to simultaneously achieve strong shielding performance and minimize flux leakage.
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 laminated side shields effectively mitigate erasure issues by providing high reluctance to flux leakage, optimizing magnetic properties, and maintaining data integrity at high recording densities.
Implementation Method 1
The laminated side shields effectively mitigate erasure issues by providing high reluctance to flux leakage
Data Source
AI summary
A perpendicular write head, the write head having an air bearing surface, the write head including a magnetic write pole, wherein at the air bearing surface, the write pole has a trailing side, a leading side that is opposite the trailing side, and first and second sides; side gaps, wherein the side gaps are proximate the write pole along the first and second side edges; and side shields proximate the side gaps, wherein the side shields have gap facing surfaces and include at least one set of alternating layers of magnetic and non-magnetic materials, wherein only one kind of material makes up the gap facing surfaces at the air bearing surfaces.