Split Main Pole Magnetic Recording Head for High Data Rate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional perpendicular magnetic recording (PMR) transducers are inefficient at high data rates and areal densities, experiencing significant performance roll-off at higher data rates due to increased rise time for the field at high frequencies.
Innovation Solution
A magnetic recording head configuration with a main pole comprising two main pole pieces, a nonmagnetic spacer, and at least one auxiliary pole, where the main pole pieces have specific geometries and magnetic properties to reduce direct magnetic coupling and achieve a reduced field rise time, allowing for higher data rate recording at greater areal densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional PMR transducer is used, then the transducer can function for basic magnetic recording, but the performance rolls off significantly at higher data rates due to increased rise time
Solution Approach 1:
The main pole is divided into two separate main pole pieces that are positioned at different heights above the media. This segmentation allows each pole piece to contribute differently to the magnetic field generation, enabling reduced rise time while maintaining functionality at higher data rates
Solution Approach 2:
The patent introduces a vertical dimension differentiation by positioning the first main pole piece at a first height and the second main pole piece at a second height above the media. This dimensional change allows the transducer to optimize field generation characteristics for high-speed operation without compromising basic recording functionality
2Productivity
If the main pole is configured for basic operation, then the structure is simple, but the transducer is inefficient at high data rates and areal densities
Solution Approach 1:
The main pole is segmented into two distinct pole pieces with different vertical positions, allowing each piece to be optimized for specific recording functions. This segmentation improves recording efficiency at high data rates while maintaining a relatively straightforward structural implementation
Solution Approach 2:
Different regions of the transducer (first main pole piece at first height, second main pole piece at second height) are given different local characteristics and positions to optimize overall recording efficiency. This allows targeted optimization without requiring complete structural redesign
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 configuration enables improved performance by providing a desired field in a shorter time, enhancing recording efficiency and supporting higher data rates and areal densities.
Implementation Method 1
The coil(s) are for energizing the main pole
Implementation Method 2
The auxiliary pole(s) have a front recessed from the ABS and are magnetically coupled with the main pole
Data Source
AI summary
A method and system for providing a magnetic recording head is described. The magnetic recording head has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The magnetic recording head includes a main pole, at least one auxiliary pole, a nonmagnetic spacer, and at least one coil. The main pole includes a first main pole piece and a second main pole piece. The first main pole piece includes a pole tip occupying a portion of the ABS and a back edge distal from the ABS. The second main pole piece has a front surface. The auxiliary pole(s) have a front recessed from the ABS and are magnetically coupled with the main pole. The nonmagnetic spacer is between the back edge of the first main pole piece and the front surface of the second main pole piece. The coil(s) are for energizing the main pole.