Magnetic Domain Wall Element Structure for Stable Magnetization Orientation
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Solution Overview
Problem
Next-generation non-volatile memories, such as MRAMs, face challenges in determining the orientation direction of magnetization in magnetization fixed parts due to differences in magnetic properties, which affects the stability and reliability of data recording.
Innovation Solution
A magnetic domain wall moving element comprising a first ferromagnetic layer, a non-magnetic layer, and a second ferromagnetic layer, with distinct magnetization fixed parts having different coercive forces and surface layers made of varying materials to stabilize and orient magnetization, allowing for precise control of magnetization direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetization fixed parts with similar magnetic properties are used, then the device structure is simpler, but the magnetization orientation direction cannot be reliably determined and varies among elements
Solution Approach 1:
The patent applies local quality by making the first and second magnetization fixed parts have different local properties: the first magnetization fixed part has greater thickness, while the second magnetization fixed part has different surface layer composition. These localized differences create distinct magnetic properties (different coercive forces) that enable reliable determination of magnetization orientation directions without requiring complete structural redesign of all components.
2Reliability
If magnetization fixed parts with different magnetic properties are used, then the magnetization orientation direction is easily determined, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by modifying specific parameters of the magnetization fixed parts: the thickness of the first magnetization fixed part is increased relative to the second, and the surface layer composition of the second magnetization fixed part is altered. These parameter changes create sufficient difference in magnetic properties (coercive force) to enable reliable magnetization orientation determination while maintaining manufacturability through controlled variations in established parameters.
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 solution enables easy determination of magnetization orientation, stabilizes magnetization states, and prevents variations in magnetization direction among magnetic domain wall moving elements, enhancing data recording reliability and efficiency in magnetic arrays.
Implementation Method 1
Constituent atoms of a portion of the first surface layer in contact with the first magnetization fixed part are different from constituent atoms of a portion of the second surface layer in contact with the second magnetization fixed part
Implementation Method 2
The magnetization of a first magnetization fixed part and the magnetization of a second magnetization fixed part can be oriented in different directions using a difference in coercive force between the two magnetization fixed parts
Implementation Method 3
The second ferromagnetic layer has a region having a magnetic domain wall formed therein
Data Source
AI summary
A magnetic domain wall moving element includes a first ferromagnetic layer, non-magnetic layer, second ferromagnetic layer, first magnetization fixed part, second magnetization fixed part, first surface layer and second surface layer. The first and second ferromagnetic layer sandwich the non-magnetic layer, the second ferromagnetic layer has a region having a magnetic domain wall formed therein, the first magnetization fixed part contacts second ferromagnetic layer, the second magnetization fixed part contacts second ferromagnetic layer at a position different from that of the first magnetization fixed part, the first is thicker than the second magnetization fixed part, the first surface layer contacts the first magnetization fixed part's first surface, the second surface layer contacts the second magnetization fixed part's first surface, and a constituent atom of a portion of the first surface layer in contact with the first magnetization fixed part are different from a constituent atom of the second surface layer.