Perpendicular Magnetic Recording Medium Ru Oxygen Split Layer
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Solution Overview
Problem
The challenge is to enhance the signal-to-noise ratio (SNR) in perpendicular magnetic recording media to achieve higher recording densities while maintaining coercive force and durability, particularly in thin protective layers that are prone to degradation and noise issues due to the auxiliary recording layer and heating processes.
Innovation Solution
A non-magnetic split layer containing Ru and oxygen is interposed between the magnetic recording layer and the auxiliary recording layer to reduce noise, and a carbon-based protective layer with specific nitrogen content is used to improve durability, allowing for a thin film thickness and maintaining high coercive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thin protective layer is used to reduce magnetic spacing and improve S/N ratio, then recording density is improved, but the protective layer becomes prone to degradation and noise issues
Solution Approach 1:
The protective layer is constructed as a composite structure combining carbon-based material with silicon oxide layers. The carbon layer provides hardness and protective function, while the silicon oxide layers provide adhesion to the magnetic recording layer and reduce noise. This composite structure enables thin film thickness (maintaining high recording density) while ensuring durability and reducing degradation issues.
2Ease of operation
If the auxiliary recording layer is used to improve saturated magnetization and overwrite characteristic, then writing performance is improved, but noise is generated that degrades S/N ratio
Solution Approach 1:
A non-magnetic split layer containing Ru and oxygen is introduced as an intermediary between the magnetic recording layer and the auxiliary recording layer. This split layer reduces noise generation from the auxiliary recording layer while maintaining its beneficial magnetic properties. The Ru and oxygen combination in the split layer specifically suppresses noise while preserving the auxiliary layer's contribution to saturated magnetization and overwrite characteristic.
3Strength
If heating process is applied to improve protective layer adhesion, then bonding is improved, but coercive force is reduced
Solution Approach 1:
The non-magnetic split layer containing Ru and oxygen serves as an intermediary that enables effective adhesion between layers without requiring high-temperature heating processes. The Ru and oxygen combination provides chemical bonding capability at lower temperatures, thereby maintaining the coercive force of the magnetic recording layer while achieving strong adhesion of the protective layer 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 effectively improves the SNR by reducing noise from the auxiliary recording layer and enhances the durability of the protective layer, enabling higher recording densities and maintaining coercive force even with thin film thicknesses, thus addressing the limitations of existing technologies.
Implementation Method 1
A non-magnetic split layer containing Ru and oxygen is interposed between the magnetic recording layer and the auxiliary recording layer to reduce noise
Implementation Method 2
a carbon-based protective layer with specific nitrogen content is used to improve durability, allowing for a thin film thickness and maintaining high coercive force
Data Source
AI summary
A perpendicular magnetic recording medium with SNR improved by reducing noise due to an auxiliary recording layer so that a higher recording density can be achieved. The perpendicular magnetic recording medium 100 includes a base, at least a magnetic recording layer 122 having a granular structure in which a non-magnetic grain boundary portion is formed between crystal particles grown in a columnar shape; a non-magnetic split layer 124 disposed on the magnetic recording layer 122 and containing Ru and oxygen; and an auxiliary recording layer 126 that is disposed on the split layer 124 and that is magnetically approximately continuous in an in-plane direction of a main surface of the base 110.