Antiferromagnetic Coupling for Magnetic Side Shield Stability
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Solution Overview
Problem
The reduction of physical size of magnetic side shields in data storage devices leads to inadvertent sensing of data bits from adjacent tracks, resulting in magnetic asymmetry and reduced data bit readback, as the smaller shields are more sensitive to stray magnetic fields and have inconsistent magnetization responses.
Innovation Solution
A magnetic element is configured with a data reader contacting a top shield and separated from a side shield on an air bearing surface, where the side shield is antiferromagnetically coupled to the top shield using a coupling layer, replacing high coercivity materials with low coercivity ferromagnetic materials to reduce stray field sensitivity and stabilize magnetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the physical size of magnetic side shields is reduced, then device form factor is improved, but magnetic asymmetry increases and data bit readback decreases due to inadvertent sensing of adjacent tracks
Solution Approach 1:
A coupling layer is introduced as an intermediary between the top shield and side shields to provide antiferromagnetic coupling. This mediator stabilizes the magnetization of the reduced-size side shields, preventing them from inadvertently sensing adjacent data tracks while maintaining their compact form factor.
Solution Approach 2:
The magnetic element employs composite material structure where low coercivity ferromagnetic materials are used for the side shields instead of high coercivity materials. This composite approach with specific material properties enables the side shields to be smaller while maintaining stable magnetization through the coupling layer, thus preventing magnetic asymmetry.
2Stability of the object's composition
If high coercivity materials are used for side shields, then magnetization stability is improved, but stray field sensitivity increases causing inconsistent magnetization responses
Solution Approach 1:
The invention changes the magnetic parameter (coercivity) of the side shield materials from high to low. By using low coercivity ferromagnetic materials and stabilizing them through antiferromagnetic coupling with the top shield via the coupling layer, the system achieves stable magnetization while reducing sensitivity to stray magnetic fields from 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 configuration enhances data resolution and reduces noise in high areal bit density environments by stabilizing the magnetization of the side shields and minimizing inadvertent sensing of adjacent data tracks, allowing for faster and more precise data reading.
Implementation Method 1
The side shield may be antiferromagnetically coupled to the top shield via a coupling layer disposed between the top and side shields
Data Source
AI summary
A magnetic element may be constructed in accordance with various embodiments as a data reader. The magnetic element can have at least a magnetic reader that contacts a top shield and is separated from a side shield on an air bearing surface (ABS). The side shield may be antiferromagnetically coupled to the top shield via a coupling layer disposed between the top and side shields.