Ruthenium Titanium Oxide Onset Layer for Magnetic Decoupling
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Solution Overview
Problem
Current perpendicular magnetic recording media face challenges in reducing bit error rates due to high transition noise between adjacent bits, which can be attributed to insufficient magnetic decoupling between grains, limiting the recording density and transition fineness.
Innovation Solution
Incorporating an onset layer comprising ruthenium and titanium oxide above a substrate, with a specific thickness and concentration range, directly under a magnetic oxide layer, and forming it on a ruthenium underlayer stack with varying pressures to enhance grain decoupling and switching field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional perpendicular magnetic recording media are used, then magnetic recording can be performed, but transition noise between adjacent bits remains high due to insufficient magnetic decoupling between grains
Solution Approach 1:
An onset layer comprising ruthenium and titanium oxide is introduced as an intermediary layer between the substrate and the magnetic oxide layer. This onset layer acts as a mediator to enhance magnetic decoupling between adjacent magnetic grains, thereby reducing transition noise and bit error rates without compromising recording functionality
2Reliability
If magnetic decoupling between grains is increased to reduce transition noise, then bit error rate decreases, but recording density and transition fineness are limited
Solution Approach 1:
The onset layer's composition parameters are precisely controlled, with titanium oxide concentration between 4.0-12.0 molecular % and deposition thickness between 2-8 Å. These parameter optimizations enable simultaneous achievement of enhanced magnetic decoupling (lower bit error rate) and maintained recording density by fine-tuning the onset layer's physical and chemical properties
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 results in a significant reduction of bit error rates by up to 0.4 orders of magnitude and narrower magnetic core widths, while maintaining negligible changes in overwrite performance, thereby improving recording density and media characteristics.
Implementation Method 1
the transition noise in turn can be decreased by increasing the magnetic decoupling between grains
Implementation Method 2
sputtering using a target of ruthenium and titanium oxide for forming an onset layer above a substrate
Data Source
AI summary
A magnetic storage medium according to one embodiment includes a substrate; an onset layer formed above the substrate, the onset layer comprising ruthenium and titanium oxide; and a magnetic oxide layer formed directly on the onset layer. A method according to one embodiment includes sputtering using a target of ruthenium and titanium oxide for forming an onset layer above a substrate, the onset layer comprising ruthenium and titanium oxide; and forming a magnetic oxide layer directly on the onset layer. Additional systems and methods are also presented.