Magnetic Head Conductive Trailing Shield for Areal Density
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Solution Overview
Problem
Conventional perpendicular magnetic recording approaches its limit, making it challenging to further increase areal recording density in magnetic recording heads.
Innovation Solution
A magnetic head design incorporating a main pole and a trailing magnetic shield with an electrically conductive, non-magnetic material layer across a trailing gap, allowing electrical current to flow between them to enhance the Ampere field for improved recording capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional perpendicular magnetic recording is used, then the recording system is simple and reliable, but the areal recording density cannot be increased further
Solution Approach 1:
The patent changes the electrical state of the trailing shield from isolated to conductive by introducing an electrically conductive non-magnetic material layer. This parameter change enables current flow through the trailing shield, generating an Ampere field that enhances the main pole field and increases areal recording density beyond conventional perpendicular magnetic recording limits.
Solution Approach 2:
The electrically conductive non-magnetic material layer serves as an intermediary component between the main pole and trailing shield. This intermediary enables electrical connection and current flow while maintaining magnetic field functionality, allowing the trailing shield to act as both a magnetic shield and an electrical conductor for Ampere field generation.
2Manufacturing precision
If the trailing shield is made electrically conductive to enhance Ampere field, then areal density increases, but electrical isolation between main pole and trailing shield is compromised
Solution Approach 1:
The patent applies local quality by making only the trailing shield electrically conductive while keeping the main pole electrically isolated. The electrically conductive non-magnetic material layer is selectively positioned at the trailing shield, creating local electrical conductivity where needed for Ampere field generation without compromising the overall electrical isolation architecture of the recording head.
3Manufacturing precision
If electrical current flows through the trailing shield to generate Ampere field, then recording capability improves, but additional manufacturing steps are required
Solution Approach 1:
The patent uses composite materials by combining magnetic materials (main pole, trailing shield) with an electrically conductive non-magnetic material layer. This composite structure integrates both magnetic shielding functionality and electrical conductivity in a single integrated component, enabling Ampere field generation without requiring separate electrical connection components or complex assembly steps.
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 enhanced Ampere field significantly increases areal density capabilities, potentially exceeding those of microwave-assisted magnetic recording (MAMR) systems, while maintaining efficient data recording and reading processes.
Implementation Method 1
allowing electrical current to flow between them to enhance the Ampere field for improved recording capabilities
Data Source
AI summary
A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes at least one electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.