Perpendicular Magnetic Head Coil Segmentation for Magnetomotive Force
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Solution Overview
Problem
Magnetic heads for perpendicular magnetic recording struggle to provide a sufficiently large magnetomotive force while reducing the length of the magnetic path through the return path section and main pole, which is essential for achieving higher recording densities and rapid write signals.
Innovation Solution
The magnetic head design includes a coil with a first winding portion extending once around the main pole and a second winding portion extending less than once around the main pole, connected in series, allowing for a reduced magnetic path length and increased magnetomotive force by utilizing multiple return path sections and winding configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of turns of the coil is reduced to shorten the magnetic path, then the magnetic path length is reduced, but the magnetomotive force becomes insufficient
Solution Approach 1:
The coil is divided into multiple winding portions (first winding portion, second winding portion, third winding portion) with different turn configurations. Each portion is positioned at different locations relative to the main pole, allowing the magnetic flux to pass through the return path section multiple times while maintaining a short magnetic path length. This segmentation enables the coil to generate sufficient magnetomotive force without requiring a large number of turns in a single continuous winding.
2Productivity
If the frequency of write signals is increased to achieve higher recording densities, then the recording density is improved, but the write current must exhibit a rapid rise which requires a shorter magnetic path
Solution Approach 1:
The coil is divided into multiple winding portions (first winding portion, second winding portion, third winding portion) with different turn configurations. Each portion is positioned at different locations relative to the main pole, allowing the magnetic flux to pass through the return path section multiple times while maintaining a short magnetic path length. This segmentation enables the coil to generate sufficient magnetomotive force without requiring a large number of turns in a single continuous winding.
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 configuration enables higher recording densities and improved writing capabilities by increasing the magnetomotive force without lengthening the magnetic path, thus enhancing the magnetic head's ability to write signals of higher frequency and reduce adjacent track erasure and wide-area track erasure.
Implementation Method 1
The coil produces a magnetic field corresponding to data to be written on the recording medium
Implementation Method 2
The main pole passes a magnetic flux corresponding to the magnetic field produced by the coil, and produces a write magnetic field from its end face
Data Source
AI summary
A magnetic head includes a coil, a main pole and a return path section. The return path section is located on the trailing side relative to the main pole so that a space is defined between the main pole and itself. The coil includes a first winding portion and a second winding portion connected in series. The first winding portion extends to pass through the aforementioned space, and extends once around the entire perimeter of the main pole as viewed from the medium facing surface. The second winding portion does not pass through the aforementioned space, and surrounds only a part of the entire perimeter of the main pole as viewed from the medium facing surface.