Magnetic Head Conductive Trailing Gap for Ampere Field
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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 technology.
Innovation Solution
A magnetic head design incorporating a main pole and a trailing magnetic shield with an electrically conductive, non-magnetic material layer in the trailing gap, allowing for an electrically conductive path between them, which enhances the Ampere field for improved recording capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
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 magnetic head is divided into separate functional components: a main pole for generating the primary magnetic field, a trailing magnetic shield for field shaping, and an electrically conductive portion for generating the Ampere field. This segmentation allows each component to be optimized independently while working together to achieve higher areal density through the combined magnetic and Ampere field effects
Solution Approach 2:
The magnetic head employs composite material construction with the electrically conductive portion made of non-magnetic material (such as copper, aluminum, or tungsten) positioned in the trailing gap. This composite structure enables simultaneous generation of magnetic field (from the main pole) and Ampere field (from the conductive portion), overcoming the limitations of conventional single-material magnetic recording heads
2Quantity of substance
If an electrically conductive portion is added to generate Ampere field, then areal density capability is enhanced, but the magnetic head structure becomes more complex
Solution Approach 1:
The electrically conductive portion is merged with the trailing magnetic shield structure, where the conductive material is positioned in the trailing gap between the main pole and the trailing magnetic shield. This merging allows the Ampere field generation function to be integrated into the existing magnetic field shaping structure, reducing overall device complexity while achieving enhanced areal density
Solution Approach 2:
The electrically conductive portion acts as an intermediary element that converts electrical current into an Ampere field, which then assists the primary magnetic field from the main pole. This intermediary mechanism enables controlled enhancement of recording capability through the Ampere field without requiring complete redesign of the magnetic head structure
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 significantly enhances areal density capabilities by utilizing the Ampere field generated by the electrical current, facilitating more efficient data recording and overcoming the limitations of conventional magnetic recording technologies.
Implementation Method 1
an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion
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.