Triple-Layer Interlayer Structure for Perpendicular Magnetic Recording Media
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Solution Overview
Problem
Current perpendicular magnetic recording media face challenges in achieving high areal recording densities and cost-effective manufacturing due to the high cost and limited availability of ruthenium (Ru) in interlayer structures, which are crucial for maintaining performance characteristics like bit error rate and signal-to-noise ratio.
Innovation Solution
A triple-layer stacked interlayer structure is introduced, comprising a Ru-containing first layer, a non-Ru containing second layer, and a Ru-containing third layer, which reduces the overall Ru content while maintaining the performance of dual-layer Ru-containing structures, using materials like RuX, Y, and Ru-based alloys to facilitate crystallographic orientation and physical separation of magnetic grains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual-layer Ru-containing interlayer structure is used, then magnetic recording performance (bit error rate, signal-to-noise ratio) is maintained, but Ru consumption and manufacturing cost increase
Solution Approach 1:
The interlayer structure is segmented into three distinct layers: a first Ru-containing layer (5-20 nm), a non-Ru containing intermediate layer (10-50 nm), and a second Ru-containing layer (5-20 nm). This segmentation allows reduction of total Ru content while maintaining the functional benefits of Ru-containing structures for crystallographic orientation and magnetic grain separation.
Solution Approach 2:
The non-Ru containing intermediate layer is introduced with specific local properties (different from Ru layers) to provide particular functions such as enhanced crystallographic orientation control or stress management, while the Ru-containing layers maintain their specific qualities for magnetic grain separation and interface quality. This local differentiation optimizes overall performance while reducing Ru consumption.
2Ease of manufacture
If Ru content in interlayer structure is reduced, then manufacturing cost decreases, but magnetic recording performance may deteriorate
Solution Approach 1:
The thickness parameters of the Ru-containing layers are optimized to 5-20 nm each, and the non-Ru intermediate layer is set at 10-50 nm. These parameter changes maintain sufficient Ru content for performance while reducing total Ru consumption compared to thicker dual-layer Ru structures. The specific thickness range balances cost reduction with performance maintenance.
3Quantity of substance
If triple-layer interlayer structure is implemented, then Ru consumption is reduced, but structural complexity increases
Solution Approach 1:
The triple-layer structure combines Ru-containing layers (for magnetic grain separation and interface quality) with a non-Ru intermediate layer (for crystallographic orientation) into a unified interlayer system. This merging of different material functionalities into a single integrated structure achieves performance benefits while managing complexity through functional integration rather than separate components.
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 triple-layer interlayer structure achieves comparable performance to dual-layer Ru-containing structures with significantly reduced Ru consumption, enhancing the cost-effectiveness and scalability of high-performance granular perpendicular magnetic recording media.
Implementation Method 1
an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon
Implementation Method 2
formed by sputter deposition
Data Source
AI summary
A perpendicular magnetic recording medium comprises a layer stack formed over a surface of a non-magnetic substrate, and comprising, in overlying sequence from the surface: a magnetically soft underlayer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer on the interlayer structure; wherein the interlayer structure is a triple-layer stacked structure comprising: a first interlayer of a first non-magnetic material proximal the magnetically soft underlayer and containing Ru; a second interlayer of a second non-magnetic material in overlying contact with the first interlayer and not containing Ru; and a third interlayer of a third non-magnetic material in overlying contact with the second interlayer and containing Ru.