High Damping Material in Write Pole Shields

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Solution Overview

Problem

The increasing recording density in data storage devices has led to reliability issues in write head designs, particularly due to flux dumping to write pole shields, which affects the performance and reliability of magnetic recording heads.

Innovation Solution

Incorporating a high damping material layer attached to the leading edge of the write pole and potentially in the side shields of the write head, which helps in managing flux leakage and improving erasure fields by reducing peak flux concentrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If recording density is increased to improve data storage capacity, then productivity is improved, but reliability deteriorates due to flux dumping to write pole shields

Engineering Contradiction:

Improverecording densityVSAvoidwrite head reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful flux dumping effect to the shields into a beneficial erasure field by strategically placing high damping material layers. The high damping material absorbs the flux that would normally be harmful, transforming it into a useful erasure function that clears residual magnetic signals, thereby improving reliability while maintaining high recording density

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the magnetic damping parameter of the shield material by introducing high damping material layers with specific damping constants. This parameter change allows the shields to absorb flux more effectively, converting the flux dumping problem into a solution that enhances erasure fields and improves write head reliability at high recording densities

Inventive Principle:

Principle #35Parameter changes

2Reliability

If high damping material layer is added to manage flux leakage, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvewrite head reliabilityVSAvoidwrite head structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite material structures by combining conventional magnetic shield materials with high damping material layers. This composite approach allows the shield to perform dual functions: traditional flux shielding and enhanced flux absorption through the high damping layer, thereby improving reliability without requiring a complete redesign of the write head structure

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies high damping material layers selectively at specific locations where flux dumping occurs most prominently, such as at the pole tips and shield regions. This localized application targetedly addresses flux management issues without unnecessarily complicating the entire write head structure, maintaining simplicity while improving reliability

Inventive Principle:

Principle #3Local quality

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

The inclusion of high damping materials enhances the reliability and performance of write heads by improving flux management and reducing erasure fields, leading to better data recording capabilities and increased reliability.

Implementation Method 1

The write pole further includes a high damping material layer. The high damping material layer has a front end that is attached to the main pole layer at the leading edge.

Methodology Applied

Scientific EffectMagnetic damping: Damping

Data Source

PatentUS10102871B1High damping materials in shields and/or write pole

Publication Date: 2018.10.16 SEAGATE TECH LLC

AI summary

A write head for recording data on a storage medium. The write head includes a bearing surface and a write pole. The write pole includes a main pole layer having a front surface that forms a portion of the bearing surface. The front surface of the write pole has a leading edge and a trailing edge. The write pole further includes a high damping material layer. The high damping material layer has a front end that is attached to the main pole layer at the leading edge.