Magnetic Head Return Path Section Formation
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Solution Overview
Problem
The existing methods for manufacturing magnetic heads for perpendicular magnetic recording systems require multiple steps to form the return path section, which complicates the process and may lead to inefficiencies in preventing adjacent track erasure and improving recording density.
Innovation Solution
A method that forms the first return path section by creating the first, second, and third portions simultaneously from the same material, simplifying the manufacturing process and integrating a write shield and return path sections to manage magnetic flux effectively, thereby preventing adjacent track erasure and enhancing recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple steps are used to form the return path section, then the manufacturing precision may be improved, but the device complexity and manufacturing time increase
Solution Approach 1:
The patent combines the formation of the first return path section into a single plating step that simultaneously creates multiple portions (first, second, and third portions) from the same material. This merging of previously separate manufacturing steps into one integrated process reduces device complexity while maintaining the necessary structural precision through controlled plating parameters
2Manufacturing precision
If multiple steps are used to form the return path section, then the manufacturing precision may be improved, but the productivity decreases
Solution Approach 1:
The patent merges multiple return path section formation steps into a single plating operation that deposits the first, second, and third portions simultaneously. This consolidation eliminates sequential processing delays and intermediate handling steps, significantly improving productivity while maintaining precision through controlled plating conditions
3Reliability
If the write shield and return path sections are integrated, then the magnetic flux management is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the write shield and return path sections into a unified magnetic flux management structure. The first return path section is positioned to work in conjunction with the write shield, creating a coordinated system that prevents adjacent track erasure more effectively than separate components, while the integrated design actually reduces overall structural complexity
Solution Approach 2:
The integrated structure serves multiple functions simultaneously: the write shield prevents magnetic flux leakage to adjacent tracks, while the first return path section provides a magnetic flux return path. This multi-functionality achieves better adjacent track erasure prevention without proportionally increasing device complexity
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
This approach allows for the efficient formation of the magnetic head in fewer steps while effectively preventing adjacent track erasure and improving recording density by managing magnetic flux through the integrated write shield and return path sections.
Implementation Method 1
a coil that produces a magnetic field corresponding to data to be written on the recording medium
Implementation Method 2
a main pole that produces a write magnetic field in a direction perpendicular to the plane of the recording medium
Implementation Method 3
The write shield and the one or more return path sections have the function of capturing a magnetic flux that is produced from the end face of the main pole and spreads in directions other than the direction perpendicular to the plane of the recording medium
Data Source
AI summary
A method of manufacturing a magnetic head includes the step of forming an accommodation part and the step of forming a return path section. The return path section lies between a main pole and a top surface of a substrate, and connects a shield and part of the main pole away from a medium facing surface to each other so that a space through which part of a coil passes is defined. The accommodation part accommodates at least part of the return path section. The step of forming the return path section forms first to third portions simultaneously. The first portion is located closer to the top surface of the substrate than is the space. The second portion is located closer to the medium facing surface than is the space. The third portion is located farther from the medium facing surface than is the space.