Magnetic Memory Device with Oblique Active Regions
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Solution Overview
Problem
Current magnetic memory devices face challenges in achieving high integration and low voltage operation while maintaining a compact size, as they require advanced lithography and high-cost process technologies, and existing designs either increase operating voltage or compromise on density.
Innovation Solution
A magnetic memory device design featuring a memory cell array structure with obliquely arranged active regions, word lines, source lines, and bit lines, where source lines are separate and shared, allowing for reduced unit memory cell size and low voltage operation by alternating bit and source lines, and using variable resistance structures connected through insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If advanced lithography and high-cost process technology are used to refine the pattern, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The memory cell array is divided into multiple blocks, with each block containing a specific arrangement of active regions, word lines, source lines, and bit lines. This segmentation allows for standardized manufacturing processes that can be repeatedly applied, reducing the need for advanced lithography while maintaining pattern precision.
Solution Approach 2:
Source lines are designed to serve multiple functions: they act as both source lines for adjacent bit lines and as shared conductive paths for multiple active regions. This multi-functionality reduces the total number of separate conductive structures needed, simplifying the manufacturing process and reducing costs.
2Device complexity
If source lines are shared between adjacent bit lines, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The memory cell array employs an asymmetric layout where source lines are positioned to serve specific groups of active regions in a non-uniform pattern. This asymmetric arrangement, combined with the oblique orientation of active regions, creates distinct electrical pathways that are easier to manufacture with standard precision while maintaining the shared source line functionality.
Solution Approach 2:
Active regions are arranged in an oblique direction relative to the word lines and bit lines, introducing a dimensional variation that helps distinguish the electrical pathways. This oblique arrangement allows shared source lines to connect to multiple active regions without requiring extremely precise alignment, as the oblique geometry provides natural separation between current paths.
3Area of stationary object
If active regions are arranged obliquely, then area efficiency is improved, but device complexity increases
Solution Approach 1:
The asymmetric oblique arrangement of active regions allows for more efficient packing within the memory cell array. By orienting active regions at an angle rather than in a conventional orthogonal pattern, the design achieves better area utilization while the systematic repetition of this asymmetric pattern across blocks maintains manufacturing simplicity.
Solution Approach 2:
The oblique arrangement of active regions introduces a diagonal dimension to the conventional orthogonal memory array layout. This dimensional change allows for more efficient space utilization by reducing wasted space between conductive structures, while the regular repetition of the oblique pattern across multiple blocks keeps the overall device complexity manageable.
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 design enables high integration, reduced unit memory cell size, and low voltage operation, preventing repeated memory cell selection and allowing for efficient data recording with voltages as low as 1.2V, while maintaining area efficiency.
Implementation Method 1
A magnetic memory device including magnetic tunnel junction (MTJ) devices has been researched
Data Source
AI summary
The magnetic memory device includes a plurality of source lines arranged in parallel in a second direction orthogonal to a first direction while extending in the first direction on a substrate, a plurality of word lines arranged in parallel in the first direction while extending in the second direction on the substrate, a plurality of bit lines arranged in parallel in the second direction while extending in the first direction on the substrate to alternate with the plurality of source lines, and a plurality of active regions arranged to extend at an oblique angle with respect to the first direction and arranged so that one memory cell is selected when one of the plurality of word lines and one of the plurality of source lines or the plurality of bit lines are selected.