STT-MRAM Common Source Plate for Cell Density and Current Reduction
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Solution Overview
Problem
Conventional STT-MRAM devices require higher current for read and write operations compared to other non-volatile memory technologies, limiting their ability to achieve high density cell array layouts and efficient data storage.
Innovation Solution
The implementation of a memory cell array structure with a common source plate that extends at angles to data and access lines, allowing for staggered magnetic tunnel junctions and reduced electrical current requirements, enabling the use of higher resistivity materials for source lines and improving cell density to 8F2 size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional source line configurations are used in STT-MRAM devices, then the device structure is simpler, but the current requirements are higher and cell density is limited
Solution Approach 1:
The common source is configured as a grid-shaped plate extending in two dimensions (first and second directions) rather than a single linear dimension. This two-dimensional extension allows the source to serve multiple memory cells simultaneously in both row and column directions, reducing the number of separate source lines needed and enabling higher cell density while maintaining lower current requirements through shared access paths.
Solution Approach 2:
The grid-shaped common source serves multiple functions: it acts as a source for memory cells in the first direction, as a source for memory cells in the second direction, and provides shared access pathways that reduce overall current requirements. This multi-functional configuration allows a single source structure to support multiple cell arrays efficiently.
2Reliability
If higher current is applied to meet read/write requirements, then reliable data storage is achieved, but cell density and storage efficiency are limited
Solution Approach 1:
The memory array is divided into multiple cell arrays with shared access lines and data lines, where each cell array is served by portions of the grid-shaped common source. This segmentation allows current to be distributed efficiently across multiple smaller groups of cells rather than requiring high current for all cells simultaneously, maintaining reliable data storage while improving overall storage efficiency through parallel access capabilities.
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 reduces the maximum resistance of the source lines, allowing for lower current application to each memory cell, enhancing data storage capabilities and enabling the use of higher resistivity materials, thus improving the efficiency and density of STT-MRAM devices.
Implementation Method 1
MRAM is a non-volatile computer memory technology based on magnetoresistance
Implementation Method 2
The free region 14, on the other hand, includes a magnetic material that has a magnetic orientation that may be switched, during operation of the cell, between a 'parallel' configuration and an 'anti-parallel' configuration
Data Source
AI summary
Memory devices include an array of memory cells including magnetic tunnel junction regions. The array of memory cells includes access lines extending in a first direction and data lines extending in a second direction transverse to the first direction. A common source includes first linear portions and second linear portions extending at an acute angle to each of the first direction and the second direction. Electronic systems include such a memory device operably coupled to a processor, to which at least one input device and at least one output device is operably coupled. Methods of forming such an array of memory cells including a common source.