Magnetic Head Pole Tapering to Reduce Wide Area Track Erase
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Solution Overview
Problem
Existing magnetic heads face the challenge of increasing the risk of wide area track erase (WATE) due to enhanced recording magnetic field strength on adjacent tracks, which compromises the improvement in magnetic saturation characteristics.
Innovation Solution
A magnetic head design featuring a main magnetic pole layer with a tapered front part and a yoke layer with a wider front part than rear part, allowing magnetic flux concentration towards the recording medium while dispersing flux at the ends, thereby reducing the magnetic field strength on adjacent tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the track-wise widths of the main magnetic pole layer and auxiliary yoke layer are uniformly narrowed to improve magnetic saturation characteristics, then recording magnetic field strength and bit error rate are improved, but the strength of recording magnetic field applied to adjacent tracks is increased, increasing the risk of wide area track erase
Solution Approach 1:
The magnetic pole layer is designed with asymmetric width variation: the front end portion has a smaller track-wise width than the rear end portion. This asymmetric configuration concentrates magnetic flux at the front end (improving saturation characteristics) while the wider rear end prevents excessive field strength on adjacent tracks (reducing WATE risk).
Solution Approach 2:
Different portions of the magnetic pole layer have different widths tailored to local requirements: the front end portion has reduced width for flux concentration and improved saturation, while the rear end portion maintains larger width to control the magnetic field distribution and prevent adjacent track interference.
2Strength
If the width of the main magnetic pole layer is reduced to concentrate magnetic flux and improve recording performance, then magnetic saturation characteristics are enhanced, but the magnetic field strength on adjacent tracks increases
Solution Approach 1:
The magnetic pole layer transitions from a uniform width design to an asymmetric design where the front end width differs from the rear end width. This creates non-uniform magnetic flux distribution that concentrates field strength at the recording interface while dispersing it away from adjacent tracks.
Solution Approach 2:
The invention addresses the one-dimensional width parameter by introducing variation along the length dimension (front-end length vs. rear-end length), creating a two-dimensional width profile that simultaneously optimizes both recording performance and adjacent track protection.
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 design enhances magnetic saturation characteristics while minimizing the risk of WATE by concentrating magnetic flux effectively and dispersing it to prevent excessive concentration on adjacent tracks.
Implementation Method 1
a main magnetic pole layer (13) capable of generating a magnetic flux (φ) of a recording magnetic field
Implementation Method 2
a return path magnetic pole layer (20) connected to the yoke rear part (222) in such a manner as to return the magnetic flux (φ) of the recording magnetic field to the main magnetic pole layer (13)
Data Source
AI summary
A magnetic head includes a main magnetic pole layer and a yoke layer. The main magnetic pole layer generates a magnetic flux of a recording magnetic field and includes a magnetic pole front part and a magnetic pole rear part. The yoke layer is disposed at the magnetic pole rear part and includes a yoke front part and a yoke rear part. The magnetic pole front part extends on a magnetic medium-facing surface side of the magnetic pole rear part with a width in a track width direction being smaller than that of the magnetic pole rear part. The yoke front part extends on the magnetic medium-facing surface side of the yoke rear part with a width in the track width direction being larger than that of the magnetic pole rear part and that of the yoke rear part.