Magnetic Head Ampere Field Assisted Recording Design
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Solution Overview
Problem
Conventional perpendicular magnetic recording approaches are facing challenges in further increasing areal recording density, making it difficult to enhance data storage capabilities effectively.
Innovation Solution
A magnetic recording head design that includes a main pole and a trailing magnetic shield with an electrically conductive, non-magnetic material portion in the record element, allowing for an electrically conductive path between them, and utilizing an Ampere field generated by electrical current to improve 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 areal recording density cannot be increased further
Solution Approach 1:
The patent introduces a spin torque oscillator stack that dynamically generates high-frequency magnetic fields through spin-polarized current, transforming the static recording process into a dynamic one. This enables assisted magnetic recording by modulating the magnetization of the storage medium at high frequencies, thereby increasing areal recording density beyond conventional limits
Solution Approach 2:
The patent changes the operating parameters by introducing spin-polarized current flow through the main pole, which generates transverse magnetic fields through the spin Hall effect or Rashba effect. This parameter change enables the generation of high-frequency magnetic fields that assist in writing high-density data patterns to the storage medium
2Quantity of substance
If spin torque oscillator stack is added to increase areal density, then recording capability is enhanced, but electrical shorting between main pole and trailing shield occurs
Solution Approach 1:
The patent extracts the spin torque oscillator stack from the conventional recording head structure and positions it specifically in the trailing gap region. This extraction and repositioning allows the STO to generate high-frequency fields for enhanced recording while the insulating barrier remains intact to prevent electrical shorting between the main pole and trailing shield
Solution Approach 2:
The patent introduces an electrically insulating barrier layer as an intermediary between the main pole and trailing shield in the trailing gap region. This insulating barrier mediates between the need for high-frequency field generation (which requires current flow) and the need for electrical insulation (which prevents shorting), allowing both functions to coexist
3Quantity of substance
If current is applied through record element to generate Ampere field, then areal density gains are achieved, but record element must be electrically conductive
Solution Approach 1:
The patent makes the record element electrically conductive so that it can serve multiple functions: (1) generate high-frequency magnetic fields through spin torque when current flows through it, and (2) generate Ampere fields when current flows between the main pole and trailing shield. This multi-functionality enables the record element to contribute to areal density enhancement through multiple magnetic field generation mechanisms
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 enhances areal density capabilities by utilizing the Ampere field to achieve significant gains in data storage density, overcoming the limitations of conventional recording technologies.
Implementation Method 1
The record element comprises a spin torque oscillator stack configured to generate a high frequency magnetic field when a spin-polarized current is applied through the record element
Implementation Method 2
generate a high frequency magnetic field when a spin-polarized current is applied through the record element
Implementation Method 3
utilizing an Ampere field generated by electrical current to improve 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 a record element located in a trailing gap between the main pole and the trailing magnetic shield. The record element includes an electrically conductive, non-magnetic material portion which is not part of a spin torque oscillator stack. The main pole and the trailing magnetic shield are electrically shorted by the record element 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 record element.