Dual Magnetic Moment Sensing Element for Data Storage Stability
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Solution Overview
Problem
Magnetic sensing elements in data storage devices face instability due to increased stripe height, leading to unwanted magnetic configurations and reduced performance in high linear bit density applications.
Innovation Solution
Creating a data sensing element with dual magnetic moment regions, a high magnetic moment region near the air bearing surface and a low magnetic moment region near the hard magnet, to enhance magnetic stability and field biasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stripe height is increased to enhance magnetic stability, then magnetic stability is improved, but unwanted magnetic configurations occur leading to reduced performance
Solution Approach 1:
The patent applies local quality by creating distinct magnetic moment regions at different locations within the sensing element. Specifically, a first magnetic moment region is positioned near the air bearing surface while a second magnetic moment region is positioned deeper in the magnetic stack. This spatial differentiation of magnetic properties allows the structure to simultaneously achieve magnetic stability through the deeper region while maintaining proper sensing performance through the surface-near region, thereby resolving the contradiction between stability and performance.
2Stability of the object's composition
If dual magnetic moment regions are created to improve stability, then magnetic stability is enhanced, but device complexity increases
Solution Approach 1:
The patent implements segmentation by dividing the magnetic sensing element into distinct functional regions with different magnetic moment characteristics. The sensing element is segmented such that a first magnetic moment region exists near the air bearing surface and a second magnetic moment region exists at a different depth within the magnetic stack. This segmentation allows each region to perform its specific function independently, achieving enhanced magnetic stability without requiring complete redesign of the entire device architecture.
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 configuration improves magnetic stability and data sensing performance by promoting orthogonal biasing near the air bearing surface and parallel magnetizations near the hard magnet, reducing the propensity for anti-parallel alignment and enhancing reading sensitivity and capacity.
Implementation Method 1
a data sensing element with dual magnetic moment regions, a high magnetic moment region near the air bearing surface and a low magnetic moment region near the hard magnet
Implementation Method 2
a data sensing element capable of detecting changes in magnetic states
Data Source
AI summary
An apparatus and associated method may be used to provide a data sensing element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination of layers and means for generating a high magnetic moment region proximal to an air bearing surface (ABS) and a low magnetic moment region proximal to a hard magnet.