Magnetic Memory Domain-Wall Structure for Fast Reliable Switching
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Solution Overview
Problem
Existing magnetic memory devices face challenges in achieving high reliability and operation speed, particularly in utilizing the movement phenomenon of magnetic domain walls effectively.
Innovation Solution
A magnetic memory device is designed with a first magnetic layer having multiple magnetic domains and domain walls, a pinned layer, and a second magnetic layer, where the magnetization direction of the second magnetic layer is either parallel or perpendicular to the top surface of the first magnetic layer, allowing for efficient movement of magnetic domain walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a magnetic memory device uses a movement phenomenon of a magnetic domain wall, then operation speed is improved, but reliability may be compromised due to unstable domain wall movement
Solution Approach 1:
The patent applies local quality by creating specific magnetic domain structures with different magnetization directions in different regions of the first magnetic layer. The first and third magnetic domains have magnetization directions anti-parallel to each other, while the second magnetic domain has a magnetization direction that is parallel to the top surface. This local differentiation stabilizes the domain wall movement by providing well-defined magnetic configurations at each location, thereby improving reliability while maintaining high operation speed through efficient domain wall motion.
Solution Approach 2:
The patent employs a composite magnetic layer structure consisting of multiple magnetic layers with different magnetization orientations. The first magnetic layer contains multiple magnetic domains with anti-parallel magnetization directions, combined with a second magnetic layer having in-plane magnetization. This composite structure creates a stable magnetic environment that ensures reliable domain wall movement while enabling fast operation through the coordinated interaction of different magnetic domains.
2Reliability
If multiple magnetic domains with anti-parallel magnetization directions are arranged sequentially, then reliability is improved through stable domain wall positioning, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the first magnetic layer into multiple magnetic domains (first, second, and third magnetic domains) with distinct magnetization directions. Each domain is sequentially arranged with well-defined boundaries, allowing stable domain wall positioning between them. This segmentation approach improves reliability by creating clear magnetic transitions while the domains are integrated within a single continuous magnetic layer, minimizing the increase in device complexity.
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 enhances the reliability and operation speed of the magnetic memory device by enabling fast and accurate movement of magnetic domain walls, thereby improving read and write operations.
Implementation Method 1
a first magnetic layer extending in a first direction, a pinned layer on the first magnetic layer, and a second magnetic layer vertically overlapping with the pinned layer with the first magnetic layer interposed between the pinned layer and the second magnetic layer. The first magnetic layer includes, a plurality of magnetic domains arranged in the first direction, and at least one magnetic domain wall between the plurality of magnetic domains
Data Source
AI summary
A magnetic memory device includes a first magnetic layer extending in a first direction, a pinned layer on the first magnetic layer, and a second magnetic layer vertically overlapping with the pinned layer with the first magnetic layer interposed between the pinned layer and the second magnetic layer. The first magnetic layer includes, a plurality of magnetic domains arranged in the first direction, and at least one magnetic domain wall between the plurality of magnetic domains, and a magnetization direction of the second magnetic layer is substantially parallel to a top surface of the first magnetic layer.