Magnetic Recording Head With Current-Assisted Trailing Shield
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Solution Overview
Problem
Magnetic recording heads face challenges in generating large magnetic fields for high areal density recording due to the narrowing of main poles, which leads to a loss of magnetic field strength.
Innovation Solution
A magnetic recording head design with a first current flow in a cross-track direction through a trailing shield and a second current flow around the main pole, utilizing insulation layers to direct currents effectively, enhancing magnetic field gradients and areal density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the main pole is narrowed to achieve high areal density recording, then the track width is reduced, but the magnetic field strength is lost
Solution Approach 1:
A trailing shield is introduced as an intermediary component between the main pole and the trailing gap. This shield carries current in the cross-track direction to generate an auxiliary magnetic field that compensates for the field loss caused by narrowing the main pole, enabling high areal density recording without sacrificing magnetic field strength
Solution Approach 2:
The invention changes the magnetic field generation mechanism by introducing current flow through the trailing shield in the cross-track direction. This parameter change creates an additional magnetic field component that supplements the main pole field, allowing the system to maintain sufficient field strength even with a narrowed main pole width
2Manufacturing precision
If shields are added around the main pole to improve flux gradient, then the pole tip field is improved, but the device complexity increases
Solution Approach 1:
The shield structure is segmented into functionally distinct components: a trailing shield for cross-track current flow to generate bias field, and side shields for flux conduction. This segmentation allows each shield to be optimized for its specific function, improving pole tip field precision while managing overall device complexity through clear functional division
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 design improves magnetic field gradients and areal density capability by generating a magnetic bias field, facilitating enhanced writing performance and jitter reduction.
Implementation Method 1
a first current flow in a cross-track direction through a trailing shield
Implementation Method 2
a second current flows in a cross-track direction around the main pole
Implementation Method 3
Magnetic recording heads, or write heads, in HDDs
Data Source
AI summary
The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.