Exchange Decoupled Magnetic Storage Medium
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Solution Overview
Problem
Current data storage mediums face challenges in controlling magnetic coupling within and between data bits, especially in high-density environments, leading to issues like bit error rates and side track erasure, due to limitations in decoupling methods and material constructions.
Innovation Solution
A data storage medium is configured with a magnetic underlayer and recording structure featuring a first magnetic layer made of a CoPt alloy and a second magnetic layer with a platinum group metal element, along with a crystallographic interlayer and exchange break layer, to optimize magnetic coupling control and reduce intragrain interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data bit density is increased to meet storage demand, then storage capacity is improved, but magnetic coupling between data bits increases causing bit errors and side track erasure
Solution Approach 1:
A non-magnetic boundary layer comprising oxide is introduced between adjacent data bits and within grains to act as a magnetic isolator. This intermediary layer prevents unwanted magnetic coupling while allowing the data storage medium to maintain high data bit density, thereby resolving the contradiction between increased storage capacity and reduced magnetic interference
Solution Approach 2:
The data storage medium employs a composite structure combining magnetic layers (containing cobalt, platinum, and chromium) with non-magnetic oxide boundaries. This composite material approach enables simultaneous achievement of high coercivity for thermal stability and magnetic decoupling for reliable data bit recording at high densities
2Reliability
If granular perpendicular recording data bits are used to control magnetic interactions, then some magnetic coupling is controlled, but intragrain magnetic coupling remains insufficiently suppressed
Solution Approach 1:
The magnetic grains are segmented into smaller units by introducing non-magnetic oxide boundaries within the grains themselves, not just between grains. This segmentation creates multiple isolated magnetic regions within what would otherwise be continuous grains, effectively suppressing intragrain magnetic coupling and enabling more precise control over magnetic interactions
3Strength
If CoPt alloy is used for the first magnetic layer, then magnetic properties are improved, but magnetic coupling with the second magnetic layer may be excessive
Solution Approach 1:
A non-magnetic exchange break layer is positioned between the CoPt alloy first magnetic layer and the second magnetic layer to act as a magnetic decoupling intermediary. This layer reduces the strength of magnetic coupling between the two magnetic layers while preserving the high coercivity properties of the CoPt alloy, preventing excessive magnetic interaction that would compromise data bit stability
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 enhances data bit recording performance by minimizing unwanted magnetic interactions, improving bit error rates and areal density, while maintaining coercivity and thermal stability, thus optimizing data storage capacity in reduced form factors.
Implementation Method 1
magnetic coupling within and between data bits of a common data storage medium
Implementation Method 2
magnetic interactions between data bits
Implementation Method 3
first magnetic layer decoupled by being constructed of an alloy of cobalt, platinum, and a platinum group metal element
Data Source
AI summary
A magnetic data storage medium capable of storing data bits may be configured at least with a magnetic underlayer structure and a recording structure. The recording structure can have at least a first magnetic layer and a second magnetic layer with the first magnetic layer decoupled by being constructed of an alloy of cobalt, platinum, and a platinum group metal element.