Magnetic Recording Head Tilted Write Shield Gap Design
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Solution Overview
Problem
Conventional magnetic recording heads face challenges in achieving high recording density and signal quality due to strong magnetic coupling between the main pole and write shield magnetic pole, leading to increased gap magnetic fields and resonance frequency mismatch, which degrades signal quality.
Innovation Solution
The magnetic recording head design includes a write shield magnetic pole with a tilted leading side end face opposite to the spin torque oscillator, increasing the distance from the main pole as it moves away from the air bearing surface, thereby mitigating the gap magnetic field and matching the high-frequency magnetic field frequency to the recording medium's resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the write gap length is shortened to increase the gradient of the magnetic field, then the recording density is improved, but the magnetic coupling between the main pole and write shield magnetic pole becomes stronger, causing the gap magnetic field to increase and the high-frequency magnetic field frequency to exceed the resonance frequency of the recording medium, degrading signal quality
Solution Approach 1:
The write shield magnetic pole is designed with a tilted leading side end face, creating a non-uniform gap structure where the gap width varies along the track width direction. This local variation in gap geometry allows different regions to serve different functions: maintaining strong magnetic coupling where needed while reducing excessive gap magnetic fields in other regions, thus resolving the contradiction between recording density and signal quality
Solution Approach 2:
The tilt angle of the leading side end face of the write shield magnetic pole is optimized to control the gap magnetic field strength. By adjusting this geometric parameter, the patent achieves the desired balance between maintaining sufficient magnetic coupling for high recording density and reducing excessive gap magnetic fields to keep the high-frequency magnetic field frequency within the resonance frequency range of the recording medium
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 enhances signal intensity, reduces signal degradation, and improves recording density by maintaining the maximum effective magnetic field while reducing the gap magnetic field, allowing for more efficient perpendicular magnetization inversion.
Implementation Method 1
a main pole 60 configured to generate a magnetic field in a direction perpendicular to a recording layer 103 of a recording medium
Implementation Method 2
a spin torque oscillator 65 arranged in a portion facing an air bearing surface between a tip portion 60a of the main pole 60 and the write shield magnetic pole 62
Data Source
AI summary
According to one embodiment, a magnetic recording head of a disk drive includes a main pole configured to generate a magnetic field in a direction perpendicular to a recording layer of a recording medium, a write shield magnetic pole opposite to a trailing side of the main pole with a gap, a coil configured to excite a magnetic flux in a magnetic circuit, and a high-frequency oscillator provided between a tip portion of the main pole on a side of the recording medium and the write shield magnetic pole to generate a high-frequency magnetic field. The write shield magnetic pole includes an end face opposite to the high-frequency oscillator and the end face is formed so that a distance from the main pole increases with an increasing distance from the recording medium.