Granular Magnetic Recording Media Exchange Tuning Layer
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Solution Overview
Problem
Conventional magnetic recording media face challenges in achieving uniform magnetic properties and narrow switching field distribution, which affect writability and thermal stability, particularly in perpendicular recording media.
Innovation Solution
A magnetic recording medium is designed with a first granular magnetic recording layer and a second continuous magnetic recording layer, separated by an exchange tuning layer that adjusts vertical coupling, optimizing anisotropy and coercivity to enhance writability and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polycrystalline magnetic alloy layers are used, then manufacturing is simplified, but magnetic property uniformity and switching field distribution deteriorate
Solution Approach 1:
The magnetic recording layer is segmented into multiple distinct layers (first magnetic recording layer with granular structure, second magnetic recording layer with continuous structure, and exchange tuning layer), where each layer performs a specific function. This segmentation allows optimization of magnetic properties in each layer independently, achieving uniform magnetic properties and narrow switching field distribution while managing complexity through functional specialization.
Solution Approach 2:
The patent employs composite magnetic layer structures combining different material compositions and microstructures (granular CoCrPtB alloy in first layer, continuous CoCr alloy in second layer, oxide-containing exchange tuning layer). This composite approach enables simultaneous achievement of high anisotropy, narrow switching field distribution, and improved writability by leveraging the complementary properties of each material component.
2Stability of the object's composition
If high anisotropy is achieved for thermal stability, then thermal stability improves, but writability deteriorates due to increased coercivity
Solution Approach 1:
The magnetic recording system is divided into two functional layers: the first magnetic recording layer provides high anisotropy for thermal stability, while the second magnetic recording layer with lower anisotropy and the exchange tuning layer facilitate writability. This segmentation allows the high-coercivity layer to ensure thermal stability without preventing the low-coercivity layer from enabling easy writing operations.
Solution Approach 2:
The exchange tuning layer acts as an intermediary between the high-anisotropy first magnetic recording layer and the low-anisotropy second magnetic recording layer. It mediates the vertical exchange coupling, allowing the write field to effectively switch the high-anisotropy layer while maintaining thermal stability, thus resolving the contradiction between writability and thermal stability.
3Stability of the object's composition
If granular magnetic structure is used for thermal stability, then thermal stability improves, but switching field distribution widens
Solution Approach 1:
The patent segments the magnetic recording structure into a granular first layer for thermal stability and a continuous second layer for narrowing switching field distribution. The continuous magnetic structure in the second layer provides uniform magnetic properties that reduce switching field distribution, while the granular first layer maintains thermal stability through its grain structure.
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 achieves improved writability, reduced bit error rate, and narrower switching field distribution, maintaining thermal stability and uniformity of magnetic properties.
Implementation Method 1
an exchange tuning layer that adjusts vertical coupling, optimizing anisotropy and coercivity
Data Source
AI summary
Aspects are directed to recording media with enhanced magnetic properties for improved writability. Examples can be included or related to methods, systems and components that allow for improved writability while reducing defects so as to obtain uniform magnetic properties such as uniformly high anisotropy and narrow switching field distribution. Some examples include a recording medium with an exchange tuning layer inserted between the hard layer and the soft, semi-soft or thin semi-hard layer so as to maximize the writability improvement of the media. Preferably, the exchange tuning layer is granular and reduces or optimizes the vertical coupling between the hard layer and the soft, semi-soft or semi-hard layer of a magnetic recording or storing device.