Coupling Feature in Magnetoresistive Trilayer Lamination
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Solution Overview
Problem
The miniaturization of data storage devices leads to increased magnetic sensitivity, resulting in large magnetic yield loss and degraded data storage reliability due to reduced physical size of data reading components, which is challenging to maintain at microscopic scales below 15 nm shield-to-shield spacing, causing magnetic noise and reduced data reading performance.
Innovation Solution
A trilayer reader with a coupling feature that has a smaller extent from the air bearing surface (ABS) than the reader, complemented by a rear bias magnet, provides uniform biasing to the magnetically sensitive portions, optimizing magnetic resolution and reducing magnetic noise by stabilizing magnetizations and minimizing demagnetization energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the physical size of data reading components is reduced to increase linear data density, then storage capacity is improved, but magnetic sensitivity increases causing magnetic noise and yield loss
Solution Approach 1:
The patent applies local quality by creating a non-uniform magnetic bias field through the coupling feature. The coupling feature has a smaller extent from the ABS than the trilayer reader, creating a localized biasing region that specifically addresses the magnetically sensitive portions of the reader where magnetic noise occurs, rather than uniformly biasing the entire structure.
Solution Approach 2:
The patent changes the magnetic field parameters by introducing a coupling feature that modifies the bias field strength and distribution. This creates a controlled magnetic environment that stabilizes magnetizations in the magnetically sensitive portions, reducing magnetic noise while maintaining the miniaturized structure.
2Quantity of substance
If the shield-to-shield spacing is reduced below 15 nm to increase data density, then storage capacity is improved, but magnetic noise increases and data reading performance degrades
Solution Approach 1:
The coupling feature provides localized magnetic biasing specifically to the magnetically sensitive portions of the trilayer reader. This local quality approach allows the system to maintain stable magnetizations in critical regions even when shield-to-shield spacing is reduced below 15 nm, thereby reducing magnetic noise without sacrificing data density.
Solution Approach 2:
The coupling feature acts as an intermediary magnetic element between the trilayer reader and the external magnetic environment. It mediates the magnetic interactions by providing a controlled bias field that stabilizes the reader's magnetizations, reducing the harmful magnetic noise effects that would otherwise occur at microscopic scales.
3Measurement precision
If the magnetically sensitive portions are made thinner to reduce magnetic noise, then magnetic resolution is improved, but manufacturing precision requirements increase
Solution Approach 1:
The coupling feature changes the magnetic field parameters to provide enhanced biasing to thinner magnetically sensitive portions. This allows the system to achieve improved magnetic resolution with thinner layers while the coupling feature compensates for the reduced magnetic stability that would normally result from the thinner structure, effectively reducing the stringency of manufacturing precision requirements.
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 magnetic resolution and reliability for high linear data bit density storage by reducing magnetic noise and maintaining stable magnetizations, allowing for scalable data storage devices even at microscopic scales.
Implementation Method 1
A trilayer reader can contact and be biased by a coupling feature that has a smaller extent from an air bearing surface (ABS) than the trilayer reader
Data Source
AI summary
A data storage device may be generally directed to a data transducing head capable of magnetoresistive data reading. Such a data transducing head may be configured with at least a trilayer reader that contacts and is biased by a coupling feature. The coupling feature may have a smaller extent from an air bearing surface (ABS) than the trilayer reader.