Magnetic Memory Device With Non-Uniform Thickness Pattern
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Solution Overview
Problem
Current magnetic memory devices face challenges in achieving high-speed and low-power operation while maintaining efficient data writing capabilities, particularly in integrating multiple bits per unit cell.
Innovation Solution
The magnetic memory device design incorporates a first conductive line with recessed portions and a magnetic pattern having different thicknesses, allowing for both perpendicular and horizontal magnetic anisotropy, enabling rapid switching with low switching current and efficient data writing of 2 bits or more per unit cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnetic memory device uses conventional uniform thickness magnetic patterns, then the structure is simple and easy to manufacture, but the switching current is high and switching speed is limited
Solution Approach 1:
The magnetic pattern is designed with non-uniform thickness, where a first portion has a first thickness and a second portion has a second thickness greater than the first thickness. This local variation in thickness creates regions with different magnetic anisotropy properties, enabling lower switching current in the thinner region while maintaining stability in the thicker region.
Solution Approach 2:
The invention transitions from a two-dimensional uniform magnetic pattern to a three-dimensional structure with varying thickness. By introducing the thickness dimension as a third dimension, the magnetic pattern can exhibit both perpendicular magnetic anisotropy (in thinner regions) and horizontal magnetic anisotropy (in thicker regions), enabling more efficient switching.
2Quantity of substance
If a magnetic memory device integrates multiple bits per unit cell, then the storage capacity increases, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
The magnetic pattern is segmented into distinct portions with different thicknesses, where each portion can represent different magnetic states. This segmentation allows encoding of multiple bits within a single unit cell by utilizing the different magnetic properties of each segment, thereby increasing storage capacity without proportionally increasing the number of physical cells.
Solution Approach 2:
The non-uniform thickness magnetic pattern serves multiple functions simultaneously: it provides both perpendicular and horizontal magnetic anisotropy, enables multi-bit storage, and maintains manufacturability through a single patterning process. This multi-functionality allows the same structural feature to address multiple technical requirements.
3Speed
If a magnetic memory device uses perpendicular magnetic anisotropy only, then the switching speed is fast, but the data retention and stability are insufficient
Solution Approach 1:
The magnetic pattern is designed as a composite structure with regions exhibiting different magnetic anisotropy types. The thinner first portion provides perpendicular magnetic anisotropy for fast switching, while the thicker second portion provides horizontal magnetic anisotropy for enhanced data retention and stability. This composite approach combines the advantages of both anisotropy types within a single magnetic pattern.
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 design enhances switching efficiency and data writing capabilities, achieving high-speed and low-power operation while integrating multiple bits per unit cell, addressing the demands for next-generation semiconductor memory devices.
Implementation Method 1
allowing for both perpendicular and horizontal magnetic anisotropy
Implementation Method 2
allowing for both perpendicular and horizontal magnetic anisotropy
Implementation Method 3
A resistance value of the magnetic tunnel junction may be changed depending on magnetization directions of the two magnetic layers
Data Source
AI summary
A magnetic memory device includes a first conductive line extending in a first direction on a substrate, a first magnetic pattern on the first conductive line, the first magnetic pattern including a first portion and a second portion that have different thicknesses, and a second conductive line on the first magnetic pattern and extending in a second direction intersecting the first direction.