Variable Resistance Memory Switching Assist Structure
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Solution Overview
Problem
Semiconductor memory devices, particularly magnetic tunnel junctions, require high driving currents to switch between resistance states, leading to increased power consumption and potential interference between adjacent elements.
Innovation Solution
Incorporating a switching assist structure with multilayered conductive structures surrounding the variable resistance element to generate a switching assist magnetic field, reducing the driving current needed for switching by employing both current-induced and field-induced magnetization switching mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high driving current is applied to switch the variable resistance element, then the switching operation is achieved, but power consumption increases and interference between adjacent elements occurs
Solution Approach 1:
A switching assist structure is introduced as an intermediary component between the current source and the variable resistance element. This structure generates a magnetic field that assists the switching process, allowing the same switching operation to be achieved with lower driving current, thereby reducing power consumption while maintaining reliability
Solution Approach 2:
The invention changes the physical parameters of the switching process by introducing a magnetic field component. The switching assist structure generates a magnetic field that modifies the switching mechanism from purely current-driven to a combination of current-induced and field-induced magnetization switching, enabling lower current operation
2Reliability
If high driving current is applied to switch the variable resistance element, then the switching operation is achieved, but interference between adjacent elements increases
Solution Approach 1:
The switching assist structure acts as a localized intermediary that confines the magnetic field generation to the specific memory cell being accessed. This localization prevents magnetic field spread to adjacent elements, reducing interference while maintaining effective switching in the target cell
Solution Approach 2:
The magnetic field generation is made local to the specific memory cell being switched. The switching assist structure is positioned and configured to generate magnetic field primarily at the target variable resistance element, creating local quality that enables precise switching without affecting neighboring cells
3Use of energy by moving object
If switching assist structure is added, then driving current is reduced, but device complexity increases
Solution Approach 1:
The switching assist structure is merged with the existing memory cell architecture, sharing common elements such as the variable resistance layer and electrode structures. This integration approach adds functionality while minimizing the increase in overall device 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 approach decreases the driving current required for switching, reduces interference between adjacent elements, and improves the operational characteristics of semiconductor memory devices by minimizing magnetic field shifts.
Implementation Method 1
a switching assist structure, located adjacent to the variable resistance element, structured to receive a second current and to produce a magnetic field at the variable resistance pattern in response to the second current
Implementation Method 2
the variable resistance pattern shows different resistance values to the first current based on a direction of the variable magnetization relative to the fixed magnetization
Data Source
AI summary
An electronic device is provided to include a semiconductor memory including a variable resistance element. The variable resistance element may include a variable resistance pattern including a first electrode layer, a variable resistance layer, and a second electrode layer that are sequentially stacked; and a switching assist structure spaced from a side wall of the variable resistance pattern to surround the variable resistance pattern and including multilayered conductive structures that are vertically spaced from one another.