Magnetic Head Bottom Shield Protrusion for Flux Containment
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Solution Overview
Problem
Magnetic heads for perpendicular magnetic recording systems face issues with adjacent track erasure due to skew, where signals on adjacent tracks are erased or attenuated during writing, and existing configurations of return path sections can lead to magnetic flux leakage and degradation of read and write characteristics.
Innovation Solution
A magnetic head design with a write shield and return path sections that include a bottom shield with a base part and protruding part, where the first return path section is connected to the bottom shield without exposing its coupling portion in the medium facing surface, and the write shield is configured to capture and redirect magnetic flux effectively, preventing adjacent track erasure and improving recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a write shield is provided near the main pole to prevent adjacent track erasure, then recording density is improved, but device complexity increases due to additional structural components
Solution Approach 1:
The bottom shield is integrated with the return path section to form a unified magnetic flux management structure. The return path section serves dual functions: providing a magnetic return path and forming part of the bottom shield structure, thereby reducing the number of separate components while maintaining effective prevention of adjacent track erasure
Solution Approach 2:
The return path section is designed to perform multiple functions simultaneously: it provides the magnetic flux return path from the main pole to the bottom shield, and also serves as part of the bottom shield structure itself. This multi-functionality reduces overall device complexity while maintaining the write shield's effectiveness
2Ease of manufacture
If the return path section is exposed in the medium facing surface to simplify structure, then ease of manufacture is improved, but magnetic flux leakage occurs degrading read and write characteristics
Solution Approach 1:
The return path section is extracted from exposure at the medium facing surface and positioned within the head structure. By removing the return path section from the medium facing surface, the invention eliminates the source of magnetic flux leakage that would otherwise degrade read and write characteristics
Solution Approach 2:
The bottom shield structure acts as an intermediary that contains and directs the magnetic flux properly. By positioning the return path section within the bottom shield structure rather than exposing it, the magnetic flux is contained and guided through the intended path, preventing leakage that would affect recording performance
3Device complexity
If the bottom shield has a simple base part structure, then device complexity is reduced, but magnetic flux containment is insufficient allowing adjacent track erasure
Solution Approach 1:
The bottom shield is segmented into a base part and an extended part. The base part provides the foundational magnetic shielding, while the extended part extends the shielding coverage to effectively contain the magnetic flux and prevent it from reaching adjacent tracks, thereby improving magnetic flux containment without excessive 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
The design effectively prevents adjacent track erasure and enhances recording density by ensuring the magnetic flux is properly managed and contained, reducing the impact of skew and heat-induced protrusions, thus improving the overall performance of the magnetic head.
Implementation Method 1
a coil, a main pole The coil produces a magnetic field corresponding to data to be written on the recording medium. The main pole allows a magnetic flux corresponding to the magnetic field produced by the coil to pass, and produces a write magnetic field for writing the data on the recording medium by means of a perpendicular magnetic recording system
Implementation Method 2
a write shield made of a magnetic material... The write shield is configured to capture and redirect magnetic flux effectively, preventing adjacent track erasure and improving recording density
Data Source
AI summary
A magnetic head includes a coil, a main pole, a write shield, and a return path section. The write shield includes a bottom shield located on the rear side in the direction of travel of a recording medium relative to the main pole. The return path section is located on the rear side in the direction of travel of the recording medium relative to the main pole and connects the bottom shield and part of the main pole away from a medium facing surface so as to define a space through which part of the coil passes. The return path section is not exposed in the medium facing surface. The bottom shield includes a base part, and a protruding part protruding from the base part toward the main pole. The base part is greater than the protruding part in length in a direction perpendicular to the medium facing surface.