Magnetic Layer Chemical Ordering Gradient for Storage Density
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Solution Overview
Problem
Magnetic recording media with perpendicular grain arrangements offer more compact storage but suffer from decreased thermal stability, necessitating improved magnetic layer designs that balance magnetic hardness and thermal stability.
Innovation Solution
A magnetic layer with varying degrees of chemical ordering and molecular structure across discrete sub-layers, formed from alloys like FePt, where the degree of ordering and structure change with distance from the substrate, enhancing magnetic hardness and thermal stability through an exchange-coupled composite structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perpendicular grain arrangement is used in magnetic recording media, then storage density is improved, but thermal stability deteriorates
Solution Approach 1:
The magnetic layer is divided into multiple sub-layers with different degrees of chemical ordering. The first sub-layer (closer to substrate) has higher chemical ordering and provides thermal stability, while the second sub-layer (farther from substrate) has lower chemical ordering and facilitates magnetization switching, enabling both high storage density and thermal stability
Solution Approach 2:
Different regions of the magnetic layer are given different properties: the first sub-layer has high chemical ordering for thermal stability, while the second sub-layer has low chemical ordering for easy magnetization switching. This local differentiation allows the system to simultaneously achieve high storage density and thermal stability
2Ease of manufacture
If uniform chemical ordering is applied throughout the magnetic layer, then manufacturing simplicity is maintained, but magnetic performance is compromised
Solution Approach 1:
The degree of chemical ordering parameter is varied through the thickness of the magnetic layer. By controlling deposition conditions or applying post-deposition treatments, the alloy transitions from high chemical ordering near the substrate to low chemical ordering at the surface, optimizing both thermal stability and magnetization switching characteristics
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 solution provides a magnetic layer with increased thermal stability and reduced switching field, maintaining data integrity and storage density while optimizing magnetic properties.
Implementation Method 1
The magnetic layer includes an alloy that has magnetic hardness that is a function of the degree of chemical ordering of the alloy
Implementation Method 2
changing the temperature of the alloy to vary the degree of chemical ordering of the alloy with respect to distance from the substrate within the layer
Implementation Method 3
enhancing magnetic hardness and thermal stability through an exchange-coupled composite structure
Data Source
AI summary
An apparatus includes a substrate and a magnetic layer coupled to the substrate. The magnetic layer includes an alloy that has magnetic hardness that is a function of the degree of chemical ordering of the alloy. The degree of chemical ordering of the alloy in a first portion of the magnetic layer is greater than the degree of chemical ordering of the alloy in a second portion of the magnetic layer, and the first portion of the magnetic layer is closer to the substrate than the second portion of the magnetic layer.