MTJ ULK Dielectric Structure for Compact, Stable MRAM Sensing
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Solution Overview
Problem
Existing 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.
Innovation Solution
The fabrication method involves forming a first magnetic tunneling junction (MTJ) on a substrate, followed by the deposition of ultra low-k (ULK) dielectric layers and passivation layers with specific etching processes to create a structured MRAM device, including slanted sidewalls and curved surfaces to optimize the magnetic tunneling junctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional magnetic field sensor technologies (AMR, GMR, MTJ sensors) are used, then magnetic field sensing function is achieved, but chip area is large and cost is high
Solution Approach 1:
The patent applies local quality by creating a localized magnetic field sensing structure using magnetic tunneling junctions with specific perpendicular magnetization orientation. The MTJ structure is selectively positioned and configured to provide enhanced sensing capability in specific regions, achieving high sensitivity in a compact footprint compared to conventional sensor technologies.
Solution Approach 2:
The patent utilizes parameter changes by transitioning from conventional in-plane magnetization to perpendicular magnetization in the magnetic tunneling junction. This parameter change in magnetization orientation enables higher sensitivity and allows for miniaturization of the sensor structure, directly addressing the chip area reduction goal while maintaining sensing reliability.
2Use of energy by moving object
If conventional magnetic field sensor technologies are used, then magnetic field sensing function is achieved, but power consumption is high
Solution Approach 1:
The patent replaces conventional magnetic sensing mechanisms with a magnetoresistive effect-based detection system using magnetic tunneling junctions. This substitution utilizes electrical resistance changes in response to magnetic field variations, enabling lower power consumption compared to traditional sensor technologies while maintaining sensing reliability through the high sensitivity of the MTJ structure.
3Measurement precision
If conventional magnetic field sensor technologies are used, then magnetic field sensing function is achieved, but sensitivity is limited
Solution Approach 1:
The patent employs composite materials by integrating multiple functional layers including ferromagnetic layers, antiferromagnetic layers, and tunnel barrier layers to form the magnetic tunneling junction. This composite structure combines the advantages of each material to achieve high sensitivity through perpendicular magnetization while managing device complexity through systematic material integration.
Solution Approach 2:
The patent applies curvature principles in the form of rounded corners and curved interfaces between magnetic layers in the MTJ structure. These curved geometries optimize magnetic domain formation and switching characteristics, enhancing sensitivity by improving magnetization reversal behavior while maintaining manufacturable device complexity.
4Reliability
If conventional magnetic field sensor technologies are used, then magnetic field sensing function is achieved, but temperature variation affects performance
Solution Approach 1:
The patent utilizes parameter changes by designing the magnetic tunneling junction with perpendicular magnetization that exhibits more stable magnetic properties across temperature variations. This parameter change in magnetization orientation provides inherent temperature compensation, improving reliability and sensing accuracy under varying thermal conditions compared to conventional in-plane magnetization sensors.
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
The method reduces chip area, lowers power consumption, and enhances sensitivity while minimizing the impact of temperature variations, resulting in an improved MRAM device.
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
forming a first ultra low-k (ULK) dielectric layer on the first MTJ
Data Source
AI summary
A method for fabricating semiconductor device includes the steps of: forming a first magnetic tunneling junction (MTJ) on a substrate; forming a first ultra low-k (ULK) dielectric layer on the first MTJ; performing a first etching process to remove part of the first ULK dielectric layer and form a damaged layer on the first ULK dielectric layer; and forming a second ULK dielectric layer on the damaged layer.