Magnetic Recording Transducer Auxiliary Pole Flare Angle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic recording heads struggle to perform effectively at higher recording densities, particularly exceeding 920 Gb/in^2, due to inadequate reliability in wide area track erasure (WATER) performance.
Innovation Solution
The design incorporates auxiliary poles with a large flare angle and reduced width, recessed from the air-bearing surface (ABS), which concentrate magnetic flux and enhance the write transducer's performance by reducing off-track field and rise time, thereby improving WATER performance and facilitating higher density recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional auxiliary poles with small flare angle and large width are used, then the structure is simple and easy to manufacture, but the magnetic flux is not concentrated sufficiently and off-track field is high, resulting in poor WATER performance at high recording densities
Solution Approach 1:
The auxiliary poles are designed with non-uniform width along their length, being wider at the base and narrower at the tip, creating different magnetic field characteristics at different locations. This local variation in geometry concentrates magnetic flux where needed while reducing off-track field, directly improving WATER performance without requiring complex additional components
Solution Approach 2:
The patent changes the geometric parameters of the auxiliary poles, specifically increasing the flare angle from conventional small angles to at least 45 degrees and reducing the width to be less than that of the main pole. These parameter modifications fundamentally alter the magnetic field distribution, enabling sufficient flux concentration and reduced off-track field for high-density recording
2Reliability
If auxiliary poles with large flare angle and reduced width are used, then magnetic flux is concentrated and off-track field is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The auxiliary poles are segmented into distinct regions with different width characteristics - a wider base portion and a narrower tip portion. This segmentation allows each region to serve its specific function: the base provides structural support and magnetic flux generation, while the tip concentrates flux and reduces off-track field, achieving performance goals through geometric division rather than requiring ultra-precise uniform dimensions
Solution Approach 2:
The patent introduces variation in the cross-sectional dimension (width) along the length of the auxiliary poles, transitioning from a uniform cross-section to a tapered profile. This dimensional change enables the auxiliary poles to perform multiple functions simultaneously - providing structural integrity while concentrating magnetic flux - thereby achieving high reliability without proportionally increasing manufacturing precision requirements
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 modified magnetic recording head achieves improved performance in higher density recording by concentrating magnetic flux and reducing off-track errors, while also being easily fabricable, thus meeting stringent reliability standards.
Implementation Method 1
The auxiliary poles 130 and 132... concentrate magnetic flux and enhance the write transducer's performance
Data Source
AI summary
A magnetic transducer has an air-bearing surface (ABS). The magnetic transducer has a main pole, at least one coil for energizing the main pole and at least one additional pole. The main pole has a yoke and a pole tip having an ABS facing surface. The at least one additional pole is adjacent to the main pole in a down track direction. The additional pole is recessed from the ABS, has a front surface facing the ABS, has at least one side surface, and has at least one flare angle between the front surface and the at least one side surface. The at least one flare angle is measured from the ABS to the at least one side surface and is at least fifty degrees and less than ninety degrees.