Co-Pt-NbO2 Sputtering Target for Magnetic Grain Separation
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Solution Overview
Problem
Existing magnetic recording media face challenges in achieving high coercive force and magnetic separation between magnetic particles, which are crucial for high-density recording, as conventional methods either reduce magnetic anisotropy or deteriorate crystallinity.
Innovation Solution
Incorporating NbO2 as a metal oxide component in a Co-Pt alloy sputtering target, with specific content ratios, to enhance magnetic separation and maintain high coercive force in the magnetic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large amount of metal oxide is added to improve magnetic separation, then magnetic separation between magnetic particles is improved, but the metal oxide penetrates into the magnetic particles, deteriorating the crystallinity of the magnetic particles, thereby decreasing the saturation magnetization Ms and magnetic anisotropy Ku
Solution Approach 1:
The invention changes the chemical composition parameter by introducing NbO2 as a specific metal oxide component in controlled amounts (0.5-30 mol%). This parameter change achieves improved magnetic separation while maintaining crystallinity, as NbO2 forms uniform grain boundaries without penetrating into magnetic particles, unlike conventional metal oxides
Solution Approach 2:
The invention creates a composite material structure where NbO2 metal oxide is dispersed in a Co-Pt alloy matrix. This composite approach allows the NbO2 to form uniform grain boundaries that improve magnetic separation while the Co-Pt alloy maintains the magnetic particle crystallinity and magnetic properties
2Force
If the substrate temperature is increased during film formation to increase magnetic anisotropy Ku, then magnetic anisotropy Ku is increased, but the magnetic separation between magnetic particles is reduced, thereby decreasing the coercive force Hc
Solution Approach 1:
The invention changes the composition parameter by adding NbO2 metal oxide, which enables achieving high magnetic anisotropy Ku without requiring high substrate temperature. The NbO2 forms uniform grain boundaries that provide magnetic separation, allowing standard temperature processing while maintaining both magnetic anisotropy and magnetic separation
3Manufacturing precision
If conventional metal oxides are used to improve magnetic separation, then magnetic separation is improved, but the coercive force Hc decreases due to penetration into magnetic particles and deterioration of crystallinity
Solution Approach 1:
The invention changes the metal oxide type parameter from conventional oxides (SiO2, TiO2, etc.) to NbO2. This specific parameter change is crucial because NbO2 has unique properties that prevent penetration into magnetic particles, allowing it to form uniform grain boundaries that improve magnetic separation while preserving the coercive force Hc of the Co-Pt alloy
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 sputtering target with NbO2 improves magnetic separation and maintains high coercive force, enabling high-density recording by forming uniform oxide grain boundaries around magnetic particles.
Implementation Method 1
each layer, such as the magnetic layer and intermediate layer, is formed by sputtering a sputtering target having a predetermined composition or structure onto a substrate
Data Source
AI summary
A sputtering target capable of maintaining high coercive force in the magnetic layer of a magnetic recording medium and improving magnetic separation between magnetic particles is provided. A sputtering target includes Co and Pt as metal components and NbO2 as a metal oxide component. Or alternatively, a sputtering target includes Co and Pt as metal components, and includes a phase containing Co, Nb, and O.