Dummy MTJ Integration in Logic Region for MRAM Layout
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Solution Overview
Problem
Current magnetoresistive random access memory (MRAM) devices face issues such as high chip area, high cost, high power consumption, limited sensitivity, and susceptibility to temperature variations, which are not adequately addressed by existing magnetic field sensor technologies like AMR, GMR, and MTJ sensors.
Innovation Solution
A semiconductor device with a novel dummy magnetic tunneling junction (MTJ) structure is directly integrated within the logic region, utilizing metal interconnections to create short or open circuits, allowing for integration of logic and MRAM regions, thereby simplifying the layout and reducing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If dummy MTJ structures are integrated within logic regions using metal interconnections, then layout area is reduced and device integration is improved, but manufacturing complexity increases due to precise alignment requirements
Solution Approach 1:
The patent merges the dummy MTJ structures with the logic region by directly integrating them using metal interconnections. The dummy MTJs are positioned within the logic region boundaries, combining two previously separate regions into a unified structure, thereby reducing overall layout area while maintaining functional differentiation through the dummy MTJ design
Solution Approach 2:
The dummy MTJ structures are nested within the logic region boundaries, with metal interconnections embedding the dummy MTJs inside the logic region area. This nesting approach allows the dummy structures to occupy space within the existing logic region without requiring additional external space, effectively reducing the total chip area
2Reliability
If metal interconnections are used to create short or open circuits in dummy MTJ structures, then leakage issues are improved and device performance is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts the leakage control function by creating intentional short or open circuits within the dummy MTJ structures using metal interconnections. By deliberately designing these circuit states in the dummy regions, the patent addresses leakage issues without affecting the functional MTJs in the MRAM region, thereby improving overall device reliability
Solution Approach 2:
The patent applies different circuit configurations (short circuit vs. open circuit) to different dummy MTJ structures based on their specific locations and functions. This local differentiation allows precise control of leakage characteristics in specific regions while maintaining appropriate functionality in other areas, enabling tailored leakage management
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 approach effectively shrinks the layout pattern of MRAM devices, improves leakage issues, and enhances overall performance by integrating logic and dummy MRAM regions, leading to more efficient and compact designs.
Implementation Method 1
Magnetoresistance (MR) effect has been known as a kind of effect caused by altering the resistance of a material through variation of outside magnetic field. The physical definition of such effect is defined as a variation in resistance obtained by dividing a difference in resistance under no magnetic interference by the original resistance.
Implementation Method 2
magnetic tunneling junction (MTJ) sensors have been widely developed in the market
Data Source
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AI summary
A semiconductor device, comprising: a substrate; a first dielectric layer disposed on the substrate, the first dielectric layer around a first metal interconnection; a second dielectric layer disposed on the first dielectric layer, the second dielectric layer around a via and a second metal interconnection, the second metal interconnection directly contacting the first metal interconnection; and a third dielectric layer disposed on the second dielectric layer, the third dielectric layer around a first magnetic tunneling junction, MTJ, structure and a third metal interconnection, wherein the third metal interconnection directly contacts top surfaces of the first MTJ structure and the second metal interconnection, and the first MTJ structure directly contacts the via.