Data Reader Front Shield Coupling Structure for Magnetic Stability

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Solution Overview

Problem

Data readers with recessed magnetic portions face magnetic instability due to inconsistent coupling between front and core shield portions, leading to reduced magnetic extent and increased magnetic volatility, which degrades data bit sensing accuracy in high-density data storage systems.

Innovation Solution

A magnetoresistive stack is positioned on an air bearing surface with a pinning structure set to a fixed magnetization, separated by a front shield with a biasing structure and a coupling structure that provides consistent coupling between the front and core shields, allowing for tuned material, size, and position adjustments to maintain stable magnetization orientations despite reduced physical size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the pinning structure is recessed from the air bearing surface to reduce magnetic extent, then data density capability is improved, but magnetic instability occurs in the front shield portion

Engineering Contradiction:

Improvedata densityVSAvoidmagnetic stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

A biasing structure is introduced as an intermediary element between the recessed pinning structure and the front shield portion. This biasing structure provides a stable magnetic field that compensates for the magnetic instability caused by the recessed pinning structure, enabling the front shield portion to maintain consistent magnetization orientation even when the pinning structure is recessed from the air bearing surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the front shield portion is separated from the core shield to enable recessed pinning structure, then manufacturing flexibility is improved, but coupling consistency between shield portions deteriorates

Engineering Contradiction:

Improvemanufacturing flexibilityVSAvoidcoupling consistency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The biasing structure serves as a magnetic intermediary that maintains consistent coupling between the front shield portion and the core shield. By providing a stable magnetic reference, the biasing structure ensures that the magnetization orientation remains consistent across the shield portions even when they are spatially separated during manufacturing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetization orientation parameter of the front shield portion is controlled and stabilized through the biasing structure. The biasing structure adjusts the magnetic field parameters to maintain consistent coupling characteristics, ensuring that the separation of shield portions during manufacturing does not result in inconsistent coupling in the final device.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If magnetic extent is reduced to access high data density, then data density is improved, but thermal volatility increases

Engineering Contradiction:

Improvedata densityVSAvoidthermal volatility

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The biasing structure acts as a protective intermediary that stabilizes the magnetization of the front shield portion against thermal fluctuations. By providing a strong, stable magnetic reference field, the biasing structure increases the energy barrier against thermal volatility, allowing the magnetic extent to be reduced for high data density applications without suffering from increased thermal instability.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 optimizes data reader performance by reducing magnetic extent while maintaining accurate data sensing, even in high-density environments, by stabilizing the magnetic structure and reducing thermal volatility, thus enhancing data storage capacity and reliability.

Implementation Method 1

a biasing structure that sets the front shield to a second fixed magnetization that differs from the first fixed magnetization

Methodology Applied

Scientific EffectMagnetic coupling: Magnetism

Implementation Method 2

A magnetoresistive stack positioned on an air bearing surface

Methodology Applied

Scientific EffectMagnetoresistance: Magnetoresistance

Data Source

PatentUS10186285B2Data reader with front shield coupling structure

Publication Date: 2019.01.22 SEAGATE TECH LLC

AI summary

A data reader may consist of at least a magnetoresistive stack positioned on an air bearing surface. A portion of the magnetoresistive stack may be set to a first fixed magnetization by a pinning structure separated from the air bearing surface by a front shield that is set to a second fixed magnetization by a biasing structure. The front shield may be separated from the biasing structure by a coupling structure.