MRAM Source Line Segmentation for Resistance Reduction
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Solution Overview
Problem
The manufacturing of Magnetic Random Access Memory (MRAM) faces challenges in reducing manufacturing costs and improving power conservation, particularly due to complex layouts and high resistance in current-carrying lines.
Innovation Solution
The implementation of a simplified source line design with a rectilinear shape and multiple parallel contacts in the MRAM apparatus, which reduces resistance and enhances manufacturability by simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex source line design is used in MRAM, then current distribution can be improved, but manufacturing complexity and resistance increase
Solution Approach 1:
The source line is divided into multiple segmentsthat are connected in parallel between the bit line and word line. This segmentation allows current to be distributed through multiple paths, improving current distribution reliability while keeping each individual segment simple in structure, thus resolving the contradiction between reliability and complexity.
2Ease of manufacture
If traditional source line design is used, then manufacturability follows conventional processes, but resistance in current carrying lines is high
Solution Approach 1:
Multiple source line segments are merged in parallel configuration to create equivalent resistance reduction. The parallel arrangement combines the current-carrying capacity of multiple lines while maintaining compatibility with conventional MRAM manufacturing processes, thus reducing power loss without sacrificing ease of manufacture.
3Ease of manufacture
If simplified source line design is implemented, then manufacturability improves, but layout complexity may increase
Solution Approach 1:
The source line segments are designed to serve multiple functions: they provide current paths, define cell boundaries, and enable selective activation of memory cells. This multi-functionality reduces the need for separate structural elements, simplifying the overall layout while maintaining ease of manufacture.
Data Source
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AI summary
A system and method to manufacture magnetic random access memory is disclosed. In a particular embodiment, a method of making a magnetic tunnel junction memory system includes forming a portion of a metal layer into a branchless source line (120) having a substantially rectilinear portion. The method also includes coupling the source line, at the substantially rectilinear portion, to a first transistor (112) using a first via (116). The first transistor is configured to supply a first current received from the source line to a first magnetic tunnel junction device. The method includes coupling the source line to a second transistor using a second via, where the second transistor is configured to supply a second current received from the source line to a second magnetic tunnel junction device.