MTJ Passivation and ULK Dielectric Layout for Compact MRAM
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Solution Overview
Problem
Current magnetoresistive random access memory (MRAM) devices face challenges such as high chip area, high cost, high power consumption, and sensitivity to temperature variations, limiting their performance and efficiency.
Innovation Solution
The method involves forming first and second magnetic tunneling junctions (MTJs) on a substrate, followed by an atomic layer deposition or high-density plasma process to create a passivation layer, and then forming an ultra-low k dielectric layer to improve the device's structure and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic field sensor technologies (AMR sensors, GMR sensors, 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 changes the structural parameters of the magnetic tunneling junction by introducing a specific spacer layer configuration and adjusting the relative positions of the pinned layer and free layer, enabling the device to achieve both sensing function and compact size
Solution Approach 2:
The patent utilizes vertical stacking of multiple layers (pinned layer, spacer layer, free layer, capping layer) to achieve magnetic field sensing functionality in a compact footprint, transitioning from planar to three-dimensional arrangement
2Reliability
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 optimizes the magnetic anisotropy parameters and layer thicknesses to reduce the switching field and operational current, thereby lowering power consumption while maintaining sensing functionality
Solution Approach 2:
The patent employs dynamic magnetic switching mechanisms where the magnetization states are reversibly changed through applied fields or currents, enabling low-power operation compared to static conventional sensors
3Reliability
If conventional magnetic field sensor technologies are used, then magnetic field sensing function is achieved, but sensitivity is limited and temperature stability is poor
Solution Approach 1:
The patent uses composite magnetic layer structures combining different ferromagnetic materials with specific magnetic anisotropy properties, achieving enhanced sensitivity and temperature compensation through material composition optimization
Solution Approach 2:
The patent introduces a spacer layer with specific magnetic properties between the pinned and free layers, creating local magnetic field distribution that enhances sensitivity and provides temperature stability through differential response
4Reliability
If passivation layer is formed using conventional deposition methods, then protection is provided, but manufacturing precision and device performance are compromised
Solution Approach 1:
The patent replaces conventional physical vapor deposition or chemical vapor deposition methods with atomic layer deposition, a more precise deposition technique that provides better control over film thickness and composition, thereby improving manufacturing precision and device performance
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 approach reduces chip area, lowers costs, and enhances sensitivity and temperature stability, resulting in a more efficient and reliable 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
performing an atomic layer deposition (ALD) process or a high-density plasma (HDP) process to form a passivation layer
Implementation Method 3
performing an atomic layer deposition (ALD) process or a high-density plasma (HDP) process to form a passivation layer
Data Source
AI summary
A method for fabricating semiconductor device includes first forming a first magnetic tunneling junction (MTJ) and a second MTJ on a substrate, performing an atomic layer deposition (ALD) process or a high-density plasma (HDP) process to form a passivation layer on the first MTJ and the second MTJ, performing an etching process to remove the passivation layer adjacent to the first MTJ and the second MTJ, and then forming an ultra low-k (ULK) dielectric layer on the passivation layer.