MTJ Interconnect Structure for Compact, Low-Power MRAM Sensing
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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, and sensitivity to temperature variations, limiting their effectiveness in magnetic field sensor applications.
Innovation Solution
The semiconductor device incorporates a magnetic tunneling junction (MTJ) with a spacer and liners, along with metal interconnections that include protrusions contacting the liners, optimized through processes like reactive ion etching and atomic layer deposition to enhance structural alignment and reduce area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional MRAM device structures are used, then magnetic field sensing function is achieved, but chip area is large
Solution Approach 1:
The device is segmented into distinct functional regions: MTJ region for magnetic sensing, source/drain regions for current path, and insulating regions for isolation. This segmentation allows compact arrangement while maintaining sensing functionality through the specific geometric configuration of these segments.
Solution Approach 2:
The invention transitions from conventional planar sensor designs to a three-dimensional structure utilizing vertical stacking of MTJ, source, drain, and insulating layers. This dimensional change enables reduced chip area by exploiting the third dimension for functional separation and integration.
2Use of energy by stationary object
If conventional MRAM device structures are used, then magnetic field sensing function is achieved, but power consumption is high
Solution Approach 1:
The insulating layer is strategically positioned between the source and drain regions, creating localized current path control. This local quality enhancement reduces unnecessary current leakage and improves power efficiency by confining current flow to the intended MTJ sensing path.
Solution Approach 2:
The insulating layer acts as an intermediary element that mediates between the source and drain regions, controlling current distribution and reducing power consumption while preserving the magnetic sensing function through proper structural design.
3Object-affected harmful factors
If conventional MRAM device structures are used, then magnetic field sensing function is achieved, but temperature sensitivity is high
Solution Approach 1:
The device employs composite material structures including MTJ (magnetic tunnel junction), insulating layers, and conductive source/drain regions. This composite structure provides thermal stability while maintaining magnetic sensing sensitivity through the synergistic properties of different materials.
Solution Approach 2:
Instead of trying to reduce temperature sensitivity through material selection alone, the invention inverts the approach by using geometric configuration and structural design (layer stacking, spacing) to compensate for temperature effects, thereby maintaining sensing reliability across temperature variations.
4Manufacturing precision
If precise structural alignment is implemented, then device performance is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating layer is formed preliminarily between the source and drain regions before final metal interconnection steps. This preliminary action establishes precise structural alignment early in the fabrication process, guiding subsequent manufacturing steps and reducing overall process complexity.
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 improves the efficiency and sensitivity of MRAM devices by reducing chip area, lowering power consumption, and minimizing temperature effects, thereby addressing the shortcomings of existing MRAM technologies.
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
Implementation Method 2
optimized through processes like reactive ion etching
Implementation Method 3
optimized through processes like reactive ion etching and atomic layer deposition
Data Source
AI summary
A semiconductor device includes a magnetic tunneling junction (MTJ) on a substrate, a spacer adjacent to the MTJ, a liner adjacent to the spacer, and a first metal interconnection on the MTJ. Preferably, the first metal interconnection includes protrusions adjacent to two sides of the MTJ and a bottom surface of the protrusions contact the liner directly.