Perpendicular Recording Medium Oxide Gradient Layer
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Solution Overview
Problem
High density perpendicular recording media face challenges in maintaining uniform magnetic properties due to abrupt changes in oxide content between granular and continuous magnetic layers, leading to variations in grain boundary sizes and degraded recording performance.
Innovation Solution
Incorporating an oxide gradient layer with a reduced oxide content between the granular and continuous magnetic layers to reduce grain boundary variations, maintaining microstructure and improving uniformity, while minimizing the oxide volume to narrow grain boundary widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an abrupt change in oxide content is used between granular and continuous magnetic layers, then the manufacturing process is simplified, but grain boundary size variations increase and magnetic property uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating a gradient oxide layer with varying oxide content between the granular and continuous magnetic layers. Instead of an abrupt transition, the oxide content gradually changes from the granular layer through an intermediate gradient layer to the continuous layer, ensuring uniform grain boundary sizes and consistent magnetic properties at the interface region.
Solution Approach 2:
The patent implements parameter changes by systematically varying the oxide content parameter across different layers. The gradient oxide layer contains intermediate oxide concentrations that transition smoothly between the high oxide content of the granular layer and the low oxide content of the continuous layer, thereby controlling grain boundary formation and maintaining magnetic property uniformity.
2Manufacturing precision
If oxide content is reduced in the gradient layer, then grain boundary variations are reduced and magnetic uniformity improves, but the layer requires more complex deposition control
Solution Approach 1:
The patent applies segmentation by dividing the transition region into distinct layers: a granular magnetic layer, a gradient oxide layer with intermediate oxide content, and a continuous magnetic layer. This segmentation allows for controlled deposition of each layer with specific oxide concentrations, making the complex gradient structure manufacturable through sequential deposition processes.
Solution Approach 2:
The patent uses composite materials by combining magnetic materials with controlled oxide content in different proportions across the layers. The gradient oxide layer acts as a composite transition zone that bridges the granular and continuous magnetic layers, enabling smooth property transitions while maintaining manufacturability through controlled material composition.
Data Source
AI summary
Apparatus for recording data and method for making the same. In accordance with some embodiments, a recording layer is supported by a substrate. The recording layer has a granular magnetic recording layer with a first oxide content, a continuous magnetic recording layer with nominally no oxide content, and an oxide gradient layer disposed between the respective granular magnetic recording layer and the continuous magnetic recording layer. The oxide gradient layer has a second oxide content less than the first oxide content of the granular layer.