SOT MRAM Selector Isolation for Read-Write Disturbance
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Solution Overview
Problem
Current non-volatile memory technologies, such as flash random-access memory, face challenges in reducing power consumption and preventing accidental programming during read and write operations, which can lead to data loss and increased wear and tear.
Innovation Solution
The implementation of a spin-orbit torque MRAM device with a magnetic tunnel junction (MTJ) and a spin-orbit torque (SOT) layer, where a selector is used to control the write path and prevent accidental programming by maintaining electrical isolation during read operations, and establishing separate read and write paths to manage voltage levels effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared path is used for read and write operations in flash memory, then device complexity is reduced, but write disturbance occurs during read operations leading to data loss and increased wear
Solution Approach 1:
The memory device is segmented into distinct read path and write path components. The read path includes a read word line and read bit line, while the write path includes a write word line and write bit line. This segmentation allows independent optimization of each path and prevents interference between read and write operations, resolving the contradiction between device simplicity and data integrity.
Solution Approach 2:
A selector device is introduced as an intermediary component to control the flow of current between the bit line and word lines. The selector enables current to flow through the memory cell during write operations while blocking current during read operations, thereby preventing write disturbance during reads and maintaining data integrity without requiring complete path separation.
2Speed
If higher voltage is applied during write operations in flash memory, then write speed is improved, but accidental programming occurs during read operations causing data loss
Solution Approach 1:
The voltage application paths are segmented into separate read and write paths. The write word line and write bit line are dedicated to write operations and can tolerate higher voltages for fast programming. The read word line and read bit line use lower voltages to prevent accidental programming. This segmentation allows each path to be optimized for its specific function without compromising the other.
Solution Approach 2:
The selector device acts as a voltage-controlled intermediary that prevents high write voltages from affecting read operations. During read operations, the selector blocks the write path, ensuring that high voltages are not applied to memory cells being read. During write operations, the selector enables the write path, allowing high voltages to be applied for fast programming without affecting read data integrity.
3Use of energy by moving object
If power consumption is reduced in MRAM devices, then energy efficiency is improved, but write disturbance during read operations increases leading to data loss
Solution Approach 1:
The memory device uses segmented read and write paths with dedicated word lines and bit lines. This segmentation allows the read path to operate at low power levels for energy efficiency while the write path can use higher power when needed. The separation prevents write disturbance during low-power read operations, maintaining data integrity while optimizing power consumption.
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 solution reduces write disturbance, maintains data integrity, and lowers power consumption by ensuring accurate and efficient read and write operations while preventing accidental programming, thus enhancing the reliability and endurance of memory devices.
Implementation Method 1
a spin-orbit torque (SOT) layer; a magnetic tunnel junction (MTJ), standing on the SOT layer
Implementation Method 2
Magnetoresistive random-access memory (MRAM), which uses electron spin to store data
Data Source
AI summary
A memory device and a memory circuit is provided. The memory device includes a spin-orbit torque (SOT) layer, a magnetic tunnel junction (MTJ), a read word line, a selector and a write word line. The MTJ stands on the SOT layer. The read word line is electrically connected to the MTJ. The write word line is connected to the SOT layer through the selector. The write word line is electrically connected to the SOT layer when the selector is turned on, and the write word line is electrically isolated from the SOT layer when the selector is in an off state.