Magnetic Domain Wall Motion Element Wiring Layer Thickness Gradient
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Solution Overview
Problem
Magnetic domain wall motion elements face instability in magnetization due to processing damage, leading to deteriorated magnetic properties, and increasing the magnetic layer thickness increases the drive current required for domain wall movement.
Innovation Solution
A magnetic domain wall motion element with a wiring layer structure that includes a first ferromagnetic layer, a nonmagnetic layer, and a spacer layer, where the thickness and surface curvature of the wiring layer are optimized to reduce processing damage and stabilize magnetization, while maintaining a small drive current requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the magnetic layer is increased to curb deterioration of magnetic properties, then magnetization stability is improved, but the amount of drive current required to move the magnetic domain wall increases
Solution Approach 1:
The patent applies local quality by creating a thickness gradient within the wiring layer, where the thickness varies from the center to the outer peripheral portion. Specifically, the thickness at the center is smaller than the thickness at the outer peripheral portion, allowing different regions to serve different functions: the center region minimizes drive current while the outer peripheral region enhances magnetization stability
Solution Approach 2:
The patent changes the physical parameter of layer thickness to resolve the contradiction. By optimizing the thickness distribution (making the center thinner and outer peripheral portions thicker), the patent achieves both reduced drive current and improved magnetization stability simultaneously
2Manufacturing precision
If the magnetic layer is processed to create the desired structure, then the wiring layer shape is improved, but the magnetic layer becomes damaged and magnetization becomes unstable
Solution Approach 1:
The patent applies preliminary action by forming the wiring layer with the desired thickness distribution before subsequent processing steps. The thickness gradient is established in advance during the wiring layer formation process, so that when etching or other processing occurs, the magnetic layer is less susceptible to damage and magnetization instability
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 optimized structure enhances magnetization stability and reduces the amount of drive current needed to move the magnetic domain wall, improving the performance of the magnetic domain wall motion element and recording array.
Implementation Method 1
An MRAM has a magnetoresistive element of which a resistance value changes according to a change in magnetization direction
Implementation Method 2
The magnetic domain wall motion element has a resistance value that changes according to a position of a magnetic domain wall within a first ferromagnetic layer
Data Source
AI summary
A magnetic domain wall motion element includes a wiring layer including a first ferromagnetic layer and configured to extend in a first direction, a second ferromagnetic layer, and a spacer layer sandwiched between the wiring layer and the second ferromagnetic layer. In any cross section of the wiring layer taken along a plane perpendicular to the first direction, a first thickness of the wiring layer at a center in a width direction is thinner than a second thickness of the wiring layer at a first outer. peripheral portion outside the center in the width direction.