Magnetic Element Orange-Peel Coupling Stability
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Solution Overview
Problem
Magnetic data sensing elements in data storage devices face instability due to unwanted magnetization configurations and reduced ferromagnetic coupling, leading to decreased data transfer rates and capacity.
Innovation Solution
A magnetic element with a lamination of layers featuring a second portion with increased roughness to generate orange-peel coupling, enhancing ferromagnetic coupling and magnetic stabilization, while maintaining interaction at the front portion, and incorporating a non-magnetic spacer layer reduction to increase resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ferromagnetic coupling is increased to improve magnetic stability, then magnetic stability improves, but device complexity increases due to additional roughening processes
Solution Approach 1:
The patent applies local quality by creating orange-peel roughness only in specific coupling portions between magnetic layers, rather than uniformly across all surfaces. This localized roughening (5-50 nm RMS) is applied selectively at interfaces where ferromagnetic coupling enhancement is needed, while other portions maintain smooth surfaces for optimal magnetic sensing performance.
Solution Approach 2:
The patent replaces traditional mechanical or chemical bonding methods with orange-peel coupling, where controlled surface roughness creates enhanced ferromagnetic coupling through increased interface area and magnetic domain interaction. This substitution eliminates complex assembly processes while achieving strong magnetic coupling.
2Quantity of substance
If shield-to-shield spacing is reduced to increase data capacity, then data capacity increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the magnetic coupling parameter by introducing orange-peel roughness (5-50 nm RMS) at layer interfaces, which enhances ferromagnetic coupling strength. This parameter change allows the magnetic element to maintain stability with reduced shield-to-shield spacing, enabling higher data capacity without proportionally increasing manufacturing precision demands.
3Force
If orange-peel roughness is increased to enhance ferromagnetic coupling, then ferromagnetic coupling improves, but magnetic sensing capability deteriorates
Solution Approach 1:
The patent applies local quality by spatially separating the roughened coupling portions from the sensing portions. Orange-peel roughness (5-50 nm RMS) is applied only at interfaces in coupling portions to enhance ferromagnetic coupling, while air bearing surface portions remain smooth to maintain optimal magnetic sensing capability and resolution.
Solution Approach 2:
The patent segments the magnetic element into distinct functional portions: coupling portions with orange-peel roughness for enhanced ferromagnetic coupling, and smooth air bearing surface portions for magnetic sensing. This segmentation allows each portion to be optimized for its specific function without compromising the other.
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 enhanced ferromagnetic coupling improves magnetic stability and data reading capabilities, allowing for higher data capacity and transfer rates with reduced shield-to-shield spacing and maintaining normal magnetic sensing at the air bearing surface.
Implementation Method 1
The second portion has a predetermined roughness between at least two layers capable of producing orange-peel coupling
Data Source
AI summary
An apparatus and associated method may be used to produce a magnetic element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination of layers with a first portion and a laterally adjacent second portion. The second portion having a predetermined roughness between at least two layers capable of producing orange-peel coupling.