Write Pole High Magnetic Moment Layer Trailing Shield
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Solution Overview
Problem
In magnetic data storage systems, the writing performance and areal density of write poles are limited by the maximum magnetic moment of the head material and pole geometry, particularly as track dimensions shrink, requiring improved magnetic field generation and gradient capabilities.
Innovation Solution
The implementation of a write pole structure featuring a high magnetic moment (HMM) material layer on the trailing shield and write pole, such as Fe16N2, in an exchange coupled structure with CoFe, enhances magnetic moment and reduces thermal instability through a frosted or recessed layer configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional head materials and pole geometry are used, then manufacturing is simpler, but magnetic moment is limited and writing performance deteriorates
Solution Approach 1:
The patent applies composite materials by combining conventional CoFe pole material with high magnetic moment (HMM) material layers. The HMM layers are deposited on specific surfaces of the pole structure (leading edge, trailing edge, and side surfaces) to create a composite structure that achieves higher magnetic moment while maintaining manufacturing feasibility through sequential deposition processes.
Solution Approach 2:
The patent implements local quality by placing HMM material layers only on specific surfaces of the pole structure rather than throughout the entire pole. The leading edge surface receives HMM material to enhance write field, while the trailing edge surface receives HMM material to improve magnetic gradient, and side surfaces receive HMM material to control field distribution. This localized application optimizes magnetic moment where needed while minimizing structural complexity.
2Area of moving object
If pole dimensions are reduced to achieve smaller track sizes, then areal density improves, but magnetic field generation capability deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the magnetic properties of the pole structure through HMM material deposition. The HMM layers change the effective magnetic moment parameter of the pole, enabling smaller pole dimensions to generate sufficient magnetic field strength. The perpendicular magnetization orientation of the HMM layers specifically enhances field generation in the write direction despite reduced pole cross-sectional area.
3Strength
If HMM material layer is added to enhance magnetic moment, then writing performance improves, but thermal instability increases
Solution Approach 1:
The patent applies local quality by positioning HMM material layers with perpendicular magnetization on specific surfaces (leading edge, trailing edge, side surfaces) rather than throughout the entire pole volume. This localized arrangement with perpendicular magnetization enhances magnetic moment while the geometric configuration and magnetization orientation provide thermal stability by reducing stray field effects and enhancing exchange coupling.
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 significantly improves writability and magnetic gradient, enabling higher areal density and thermal stability, allowing for more efficient data storage at smaller track sizes.
Implementation Method 1
an electrical current is caused to flow through a conductive coil to induce a magnetic field in a write pole
Implementation Method 2
a high magnetic moment (HMM) material layer on a surface of the trailing shield facing the write pole
Implementation Method 3
in an exchange coupled structure with CoFe, enhances magnetic moment and reduces thermal instability
Data Source
AI summary
A write pole structure disclosed herein includes a write pole, a trailing shield, and a high magnetic moment (HMM) material layer on a surface of the trailing shield facing the write pole.