Magnetic Write Head with Varying Side Gap Spacing
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Solution Overview
Problem
Perpendicular magnetic recording technologies face challenges in achieving high data rate and capacity due to limitations in the design of magnetic write heads, particularly in maintaining a strong magnetic field gradient while minimizing field loss to side portions during writing.
Innovation Solution
A magnetic write head design featuring a write pole with a pole tip region and a flared region, where the side gap spacing is larger in the flared region than in the pole tip region, achieved through collimated sputter deposition of non-magnetic material, enhancing the magnetic performance by minimizing field loss to the shield during writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If uniform side gap spacing is used between write pole and trailing shield, then manufacturing is simplified, but magnetic field loss to side portions increases during writing
Solution Approach 1:
The side gap spacing is made non-uniform, with the first spacing (at pole tip) being smaller than the second spacing (at flared region). This local variation optimizes magnetic field distribution by reducing field loss to the trailing shield during writing while maintaining manufacturability through defined spacing relationships.
2Force
If smaller side gap spacing is used between write pole and trailing shield, then magnetic field concentration is improved, but field loss to side portions increases
Solution Approach 1:
Different spacing values are applied at different locations: smaller first spacing at the pole tip region maintains strong field gradient for effective writing, while larger second spacing at the flared region minimizes field loss to the trailing shield. This local differentiation resolves the contradiction between field concentration and field loss.
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 varying side gap spacing improves the write field gradient, increasing writing speed and data recording efficiency by reducing field loss to the sides of the shield, thereby enhancing the overall magnetic performance of the write head.
Implementation Method 1
achieved through collimated sputter deposition of non-magnetic material
Implementation Method 2
A strong, highly concentrated magnetic field emits from the write pole in a direction perpendicular to the magnetic disk surface
Implementation Method 3
A GMR or TMR sensor has been employed for sensing magnetic fields from the rotating magnetic disk
Data Source
AI summary
A magnetic write head for perpendicular magnetic recording. The magnetic write head includes a write pole having a pole tip region and a flared region. The write pole also has a trailing, wrap-around magnetic shield that is separated from the sides of the write pole by a non-magnetic side gap layer. The write head is formed such that the side gap spacing is larger in the flared region than in the pole tip region. This varying gap spacing can be formed by depositing a non-magnetic material using a collimated sputter deposition aligned substantially perpendicular to the air bearing surface. This collimated sputtering deposits the non-magnetic material more readily on the sides of the write pole in the flared region than in the pole tip region.