Magnetic Domain Wall Displacement Recording Element Flux Supply

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Solution Overview

Problem

Magnetic domain wall displacement type magnetic recording elements face instability due to current concentration and heat generation when physical unevenness is introduced on the magnetic recording layer, leading to unreliable data storage.

Innovation Solution

A magnetic domain wall displacement type magnetic recording element is designed with a first ferromagnetic layer having a magnetic flux supply region at its ends, comprising ferromagnetic materials with different magnetization directions and an intermediate layer, which limits the movement range of the magnetic domain wall and stabilizes resistance changes by generating a controlled magnetic field.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If physical unevenness is provided on the magnetic recording layer to control magnetic domain wall movement, then the movement range of the magnetic domain wall is limited, but current concentration occurs in recessed portions causing heat generation and operational instability

Engineering Contradiction:

Improveoperational stabilityVSAvoidcurrent concentration and heat generation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical approach of creating physical unevenness (recessed portions) with a magnetic field-based approach. Magnetic flux supply regions are introduced to generate magnetic fields that control domain wall movement, eliminating the need for physical surface modifications and thus avoiding current concentration and heat generation issues.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the control mechanism from physical geometry (surface unevenness) to magnetic field parameters. By adjusting the magnetic flux supply regions' position, size, and intensity, the domain wall movement is controlled without physical contact, avoiding the harmful effects of current concentration in recessed areas.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the magnetic domain wall movement range is limited to ensure stable operation, then data storage reliability improves, but the element complexity increases due to additional structures

Engineering Contradiction:

Improvedata storage reliabilityVSAvoidelement structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the magnetic flux supply regions with the existing ferromagnetic layer structure. The supply regions are integrated into the layer stack rather than being separate components, thus limiting domain wall movement while minimizing additional structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ferromagnetic layer serves multiple functions: it provides the base magnetic structure and simultaneously contains magnetic flux supply regions that control domain wall movement. This multi-functionality reduces the need for separate control structures, balancing reliability improvement with structural simplicity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 configuration allows for stable control of the magnetic domain wall movement within a predetermined range, enhancing data storage reliability by preventing current concentration and heat generation, thus improving the sensitivity and reliability of the recording element.

Implementation Method 1

the first ferromagnetic layer has a magnetic flux supply region at least at a first end in the first direction

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

the resistance value changes continuously according to the position of the magnetic domain wall in the magnetic recording layer

Methodology Applied

Scientific EffectMagnetoresistance: Magnetoresistance

Data Source

PatentUS10600461B2Magnetic domain wall displacement type magnetic recording element and magnetic recording array

Publication Date: 2020.03.24 TDK CORP

AI summary

A magnetic domain wall displacement type magnetic recording element including a first ferromagnetic layer including a ferromagnetic material, a magnetic recording layer configured to extend in a first direction crossing a laminating direction of the first ferromagnetic layer and including a magnetic domain wall, and a nonmagnetic layer sandwiched between the first ferromagnetic layer and the magnetic recording layer, wherein the first ferromagnetic layer has a magnetic flux supply region at least at a first end in the first direction.