Write Pole High Magnetic Moment Material Lamination
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Solution Overview
Problem
Current magnetic data storage systems face limitations in writing performance and areal density due to the maximum magnetic moment of traditional write pole materials, particularly as track dimensions shrink, necessitating enhanced magnetic field generation and gradients.
Innovation Solution
Incorporating a high magnetic moment (HMM) material layer on the write pole and trailing shield, comprising a laminated structure of rare earth and transition metal layers, with intermediate layers to mediate the RKKY coupling effect, increasing the magnetic moment and enabling higher data density writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional write pole materials are used, then the structure is simple and manufacturing is easier, but the magnetic moment is limited and writing performance deteriorates
Solution Approach 1:
The patent applies composite materials by combining rare earth materials (such as Tb, Dy, Gd) with transition metal materials (such as Co, Fe, Ni) to form a laminated structure. This composite approach enables the write pole to achieve magnetic moments exceeding 2.45 Tesla, overcoming the limitations of traditional single-material write poles while maintaining structural feasibility through controlled layering.
Solution Approach 2:
The write pole structure is segmented into multiple thin layers of alternating rare earth and transition metal materials. Each layer has a thickness of approximately 5-100 nanometers, creating a laminated composite structure that maximizes magnetic moment while maintaining manufacturability through standard thin-film deposition techniques.
2Quantity of substance
If track dimensions are shrunk to increase density, then storage capacity increases, but the magnetic field generation capability deteriorates due to material limitations
Solution Approach 1:
The laminated composite of rare earth and transition metal materials generates magnetic moments greater than 2.45 Tesla, providing sufficient magnetic field strength even when track dimensions are reduced. This enables continued scaling to higher data densities without sacrificing write field capability.
Solution Approach 2:
The patent changes the fundamental magnetic parameter of the write pole material by incorporating rare earth elements with high magnetic moments. This parameter change allows the system to maintain adequate magnetic field generation as track dimensions shrink, enabling higher areal density recording.
3Reliability
If higher magnetic moment is achieved through material enhancement, then writing performance improves, but manufacturing complexity increases
Solution Approach 1:
The write pole is fabricated as a laminated structure with multiple thin layers of rare earth and transition metal materials, each approximately 5-100 nanometers thick. This segmentation approach enables the use of standard thin-film deposition techniques while achieving the desired magnetic moment enhancement.
Solution Approach 2:
The patent modifies the material composition parameters by incorporating rare earth materials into the write pole structure. This parameter change achieves superior writing performance while remaining compatible with existing magnetic recording head manufacturing processes.
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 implementation of HMM material layers enhances the magnetic moment of the write pole structure, allowing for improved writing performance and increased areal density by generating larger write fields and field gradients, effectively addressing the limitations of traditional materials.
Implementation Method 1
with intermediate layers to mediate the RKKY coupling effect, increasing the magnetic moment
Data Source
AI summary
A write pole structure includes a write pole and a trailing shield wherein the write pole includes a high magnetic moment (HMM) material layer on a surface of the write pole facing the trailing shield, wherein the HMM material layer includes a laminated layer including a rare earth material layer and a transition metal layer.