Magnetic Element Side Shield Diffusion Barrier

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Solution Overview

Problem

The challenge in data storage devices is to maintain stable magnetic performance and resolution at reduced form factors, where scaling down magnetic elements leads to manufacturing difficulties and increased magnetic noise due to minimization of data bits and tracks, requiring improved magnetic shielding and biasing.

Innovation Solution

A magnetic element is configured with a side shield positioned adjacent to a magnetic stack, featuring a diffusion barrier that decouples the permanent magnet from the shield layer, allowing for tuned magnetic coercivity and anisotropy, and enabling precise magnetic operation and shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If magnetic elements are scaled down to reduced form factors, then data storage density increases, but magnetic noise increases and manufacturing precision deteriorates

Engineering Contradiction:

Improvedata storage densityVSAvoidmagnetic noise

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

A diffusion barrier layer is introduced as an intermediary between the permanent magnet and the shield layer. This barrier prevents direct contact and material diffusion, allowing independent optimization of each layer's magnetic properties. The barrier acts as a mediator that maintains magnetic shielding effectiveness while preventing degradation of the permanent magnet's coercivity, thereby reducing magnetic noise in scaled-down devices.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The side shield structure is segmented into distinct functional layers: a permanent magnet layer, a diffusion barrier layer, and a soft magnetic shield layer. This segmentation allows each layer to be independently designed and optimized - the permanent magnet provides strong biasing, the barrier prevents material interdiffusion, and the soft magnetic layer provides shielding. This layered approach maintains performance in reduced form factors by preventing the degradation that would occur in a monolithic structure.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If permanent magnet and shield layer are directly contact, then device complexity is reduced, but magnetic performance stability deteriorates due to material diffusion

Engineering Contradiction:

Improveshield structure complexityVSAvoidmagnetic coercivity stability

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The diffusion barrier serves as a thin intermediary layer that physically separates the permanent magnet and soft magnetic shield layer. This barrier prevents atomic diffusion between the two materials during fabrication and operation, maintaining the permanent magnet's coercivity and the shield layer's magnetic properties. The added complexity is minimal - a thin deposited layer - but the stability improvement is significant.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If diffusion barrier is added between permanent magnet and shield layer, then magnetic coercivity stability is improved, but device complexity increases

Engineering Contradiction:

Improvemagnetic coercivity stabilityVSAvoidlayer structure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The diffusion barrier is implemented as a thin film layer deposited between the permanent magnet and shield layer. This thin-film approach maintains structural simplicity while providing the necessary functional separation. The barrier layer is thin enough to minimize added complexity but sufficient to prevent material diffusion and maintain magnetic property stability throughout device operation.

Inventive Principle:

Principle #30Flexible shells and thin films

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 reduces magnetic noise, enhances magnetic response, and stabilizes the magnetic element, enabling reliable data access and increased areal density in data storage devices with faster data transfer rates and improved reliability.

Implementation Method 1

The permanent magnet can be separated from a first portion of the shield layer by a diffusion barrier that decouples the permanent magnet from the shield layer

Methodology Applied

Scientific EffectDiffusion barrier: Diffusion Barrier

Data Source

PatentUS8995096B2Magnetic element side shield with diffusion barrier

Publication Date: 2015.03.31 SEAGATE TECH LLC

AI summary

Various embodiments may position a side shield adjacent to and separated from a stack sidewall of a magnetic stack with the side shield having a shield layer disposed between the stack sidewall and a permanent magnet. The permanent magnet can be separated from a first portion of the shield layer by a diffusion barrier that decouples the permanent magnet from the shield layer.