MRAM Magnetic Field Generating Components with Lateral Offset
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Solution Overview
Problem
Magnetic Random Access Memory (MRAM) devices face challenges with bulky magnetic field lines that can adversely affect neighboring cells, particularly as device size decreases, due to the limited available write windows and increased density, which complicates reliable switching and operation.
Innovation Solution
The implementation of a magnetic random access memory device configuration with a magnetic tunnel junction (MTJ) and magnetic field generating components where the electric power source connections are laterally offset, allowing for parallel current flow through the components to generate sufficient magnetic fields for switching with reduced current requirements, thereby minimizing adverse effects on neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic field generating lines are used to switch MTJs, then switching function is achieved, but the lines become bulky and adversely affect neighboring MTJs
Solution Approach 1:
The magnetic field generating function is segmented from the conventional bulky lines into two separate magnetic field generating components positioned on opposite sides of the MTJ. Each component is directly connected to the MTJ and generates a focused magnetic field locally, eliminating the need for extended magnetic field lines that would affect neighboring cells.
Solution Approach 2:
The magnetic field generation is localized to immediate proximity of each MTJ through direct connections. The magnetic field generating components are positioned and connected such that their magnetic field influence is concentrated on the target MTJ only, creating local quality control over the magnetic field distribution and preventing interference with neighboring cells.
2Productivity
If device size is reduced to increase density, then higher MRAM density is achieved, but magnetic fields from switching lines adversely affect neighboring MTJs
Solution Approach 1:
The magnetic field generating function is divided into separate components for each MTJ, allowing independent control and focused field generation. This segmentation enables compact arrangement of MTJs without requiring large spacing for magnetic field isolation, thus achieving higher density while preventing interference.
Solution Approach 2:
The magnetic field generating components are positioned in a planar arrangement with direct connections to MTJs, utilizing two-dimensional space efficiently. This dimensional approach allows compact cell layout with reduced footprint compared to conventional three-dimensional routing of magnetic field lines, enabling higher density without increasing vertical complexity.
3Reliability
If conventional magnetic field lines are used, then switching is achieved, but available write windows are limited
Solution Approach 1:
The magnetic field generation is localized to the immediate vicinity of each MTJ through direct connections, allowing precise control of the magnetic field application. This local quality enables flexible switching operations with well-defined write windows, as the magnetic field is applied exactly where needed without dispersion or interference from extended field lines.
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 configuration enables higher MRAM densities and reduces switching current needs, allowing for more compact and reliable operation without disturbing neighboring MTJ cells, thus addressing the limitations of existing MRAM technologies.
Implementation Method 1
first and second magnetic field generating component directly connected to the magnetic tunnel junction on opposite sides of the magnetic tunnel junction
Implementation Method 2
When a current is passed through one of the lines, it produces a magnetic field that influences each of the MTJs underneath it
Implementation Method 3
An electrical resistance across the layers of the MTJ varies depending on the magnetic orientation of the free layer with respect to the pinned layer
Data Source
AI summary
An exemplary embodiment of a magnetic random access memory (MRAM) device includes a magnetic tunnel junction having a free layer, a first electrode (first magnetic field generating means) having a first portion that covers a surface of the free layer, and an electric power source connected to the first electrode via a connection that covers less than half of the first portion of the first electrode. Another exemplary embodiment of an MRAM device includes a magnetic tunnel junction, first and second electrodes (first and second magnetic field generating means) directly connected to the magnetic tunnel junction on opposite sides of the magnetic tunnel junction, and an electric power source having one pole connected to the first electrode via a first connection and having a second pole connected to the second electrode via a second connection, wherein the first and second connections are laterally offset from the connections between the first and second electrodes and the magnetic tunnel junction. Methods of operating and manufacturing these magnetic random access memories are also disclosed.