Electrodeposited Materials for Magnetic Recording Head Properties
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Solution Overview
Problem
Existing electrodeposition methods struggle to achieve uniform composition and desired properties in electrodeposited materials, particularly for magnetic recording heads, due to the non-uniform nature of diffusion-controlled deposition.
Innovation Solution
Control the concentration of diffusion-controlled species in the electrodeposition process by manipulating factors such as electrolyte solution formulation, mask features, and substrate shape to intentionally achieve non-uniform deposition patterns, allowing for controlled variation in properties like resistivity, coercivity, and anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If diffusion-controlled deposition is used to deposit materials onto a substrate, then the deposition process can be simplified and faster, but the deposited material has non-uniform composition over the substrate surface
Solution Approach 1:
The patent applies local quality by creating different deposition conditions in different regions of the substrate. By using masks with different opening sizes and shapes at different locations, the diffusion-controlled deposition process produces locally optimized compositions - smaller features receive higher concentrations of diffusion-controlled species while larger features receive lower concentrations, achieving spatially varying material properties without requiring multiple separate deposition processes
2Manufacturing precision
If conventional electrodeposition methods are used to achieve uniform composition, then material uniformity is improved, but the process becomes more complex and slower
Solution Approach 1:
The patent changes the fundamental parameter of the deposition process by operating in the diffusion-controlled regime rather than the charge-transfer-controlled regime. This parameter change allows the use of simple masks with geometric features to achieve precise compositional control, eliminating the need for complex multi-step processes, multiple baths, or sophisticated real-time monitoring systems while maintaining or improving composition uniformity
3Productivity
If diffusion-controlled deposition is used to deposit alloy materials, then the deposition process is faster, but the alloy composition becomes non-uniform across the substrate
Solution Approach 1:
The patent uses local quality by designing masks with spatially varying features that correspond to the desired alloy composition distribution. Different regions of the mask with different opening sizes and shapes control the local diffusion rates of alloying species, enabling faster deposition overall while maintaining precise control over spatial composition variations in the final alloy layer
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
Enables the production of electrodeposited structures with desired properties by intentionally controlling the concentration of diffusion-controlled species, leading to improved performance and reliability in magnetic recording heads.
Implementation Method 1
A voltage is applied between the submerged workpiece and a separate electrode also in the electrolyte solution, to cause current to pass through the electrolyte solution and cause ionic species of the dissolved electrolyte solution to become deposited at the surface of the submerged item as an electrodeposited material.
Implementation Method 2
Electrodeposition methods, also known as 'electroplating,' are very well known, and are used to prepare a very large variety of items and devices for consumer and industrial purposes.
Implementation Method 3
the phenomena of 'diffusion-controlled deposition' of that species, to produce useful, desired, or advantageous electrodeposited materials
Data Source
AI summary
Described are electrodeposition methods, and materials and structures prepared by electrodeposition methods, and devices prepared from the electrodeposited materials.