MRAM Cell MTJ Integration for 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 sensing applications.
Innovation Solution
A semiconductor device design incorporating a magnetic tunneling junction (MTJ) between metal-oxide semiconductor (MOS) transistors with symmetrical interlayer dielectric and liner structures, eliminating unnecessary isolation structures and using conductive materials for electrodes and ferromagnetic layers to enhance magnetic field sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional MRAM devices use traditional magnetic field sensor technologies (AMR sensors, GMR sensors, MTJ sensors), then magnetic field sensing capability is achieved, but chip area increases, cost increases, power consumption increases, and temperature stability deteriorates
Solution Approach 1:
The patent combines the magnetic field sensing function directly into the MRAM memory cell structure by integrating MTJ elements with transistor circuits. The MTJ-based sense amplifier shares the same chip area with storage elements, eliminating the need for separate magnetic field sensor devices. This merging approach achieves magnetic field sensing capability while reducing overall chip area compared to conventional separate sensor implementations.
2Measurement precision
If conventional MRAM devices use traditional magnetic field sensor technologies, then magnetic field sensing capability is achieved, but power consumption increases
Solution Approach 1:
The sense amplifier and magnetic field sensing function are integrated into the same circuit structure as the memory storage elements. The MTJ-based sense amplifier uses the same read current paths and transistor components as normal memory operations, allowing magnetic field sensing to occur during standard read operations without requiring additional power consumption beyond what is already needed for memory access.
3Measurement precision
If conventional MRAM devices use traditional magnetic field sensor technologies, then magnetic field sensing capability is achieved, but temperature stability deteriorates
Solution Approach 1:
The patent employs MTJ elements with specific material compositions and structural configurations that exhibit improved temperature stability compared to traditional AMR or GMR sensors. The magnetic tunneling junction's resistance change characteristics are less sensitive to temperature variations, and the integrated circuit design includes compensation mechanisms that maintain sensing accuracy across a wider temperature range, thereby improving temperature stability while achieving magnetic field sensing capability.
4Area of stationary object
If MRAM devices integrate MTJ between MOS transistors with symmetrical interlayer dielectric and liner structures, then chip area is reduced and power consumption is lowered, but device complexity increases
Solution Approach 1:
The patent employs a symmetrical interlayer dielectric and liner structure configuration around the MTJ element, where identical dielectric layers and liner structures are placed on both sides of the MTJ. This symmetrical design simplifies the fabrication process by using repeated patterns and standard deposition techniques, reducing device complexity despite the integrated structure. The symmetry allows for simplified alignment and reduced variability in manufacturing.
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 design reduces chip area, lowers power consumption, and improves temperature stability, resulting in a more efficient and cost-effective MRAM device with enhanced magnetic field sensing capabilities.
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. The physical definition of such effect is defined as a variation in resistance obtained by dividing a difference in resistance under no magnetic interference by the original resistance.
Implementation Method 2
a first metal-oxide semiconductor (MOS) transistor and a second MOS transistor on a substrate; a first gate structure on the substrate; a second gate structure on the substrate
Data Source
AI summary
A semiconductor device includes: a first metal-oxide semiconductor (MOS) transistor and a second MOS transistor on a substrate; a magnetic tunneling junction (MTJ) between the first MOS transistor and the second MOS transistor; a first interlayer dielectric (ILD) layer on one side of the MTJ and above the first MOS transistor; and a second ILD layer on another side of the MTJ and above the second MOS transistor.