Magnetic Memory Device Single-Layer Pinned Pattern
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Solution Overview
Problem
Current magnetic memory devices face challenges in achieving high integration and low power consumption while maintaining stable magnetic properties, particularly due to issues with magnetization direction control and surface roughness affecting resistance switching in magnetic tunnel junctions.
Innovation Solution
The magnetic memory device incorporates a reference magnetic structure with a single-layer ferromagnetic first pinned pattern and an exchange coupling pattern, along with a polarization enhancement magnetic pattern, to stabilize magnetization and reduce surface roughness, enabling improved magnetic anisotropy and tunneling magnetoresistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer ferromagnetic structure is used in the first pinned pattern, then magnetic properties can be adjusted, but manufacturing complexity and surface roughness increase
Solution Approach 1:
The patent extracts the essential magnetic pinning function from complex multi-layer ferromagnetic structures and implements it using a simplified single-layer ferromagnetic material in the first pinned pattern. This extraction maintains the necessary magnetic properties while eliminating the complexity and surface roughness issues associated with multi-layer structures.
Solution Approach 2:
The patent uses composite material structures in the second pinned pattern (alternating ferromagnetic and non-magnetic layers) while keeping the first pinned pattern as a single-layer ferromagnetic material. This selective use of composite materials optimizes the balance between magnetic property control and manufacturing simplicity.
2Reliability
If conventional pinned patterns are used, then magnetic memory functionality is achieved, but switching field distribution is wide and stability is poor
Solution Approach 1:
The patent segments the pinned pattern into two distinct parts: a first pinned pattern with single-layer ferromagnetic material and a second pinned pattern with alternating ferromagnetic and non-magnetic layers. This segmentation allows each part to fulfill specific functions, improving overall magnetic stability and switching field uniformity.
Solution Approach 2:
The patent applies different material structures to different regions of the pinned pattern. The first pinned pattern uses single-layer ferromagnetic material optimized for basic pinning, while the second pinned pattern uses alternating layers optimized for enhanced magnetic anisotropy and stability. This local quality differentiation resolves the contradiction between stability and precision.
3Productivity
If high integration is pursued, then device density increases, but magnetic property control becomes difficult
Solution Approach 1:
The patent introduces a vertical layering dimension to the pinned pattern structure, with the first pinned pattern at the bottom and the second pinned pattern above it. This vertical arrangement allows for high integration density while maintaining distinct functional zones that ensure reliable magnetic property control, effectively resolving the contradiction between density and stability.
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 enhances the magnetic properties of the tunnel junction, improving switching characteristics and reducing the distribution of switching fields, thus enabling more efficient and stable data storage with improved mass production feasibility.
Implementation Method 1
an exchange coupling pattern between the first pinned pattern and the second pinned pattern
Implementation Method 2
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 reference magnetic structure, a free magnetic structure, and a tunnel barrier pattern therebetween. The reference magnetic structure includes a first pinned pattern, a second pinned pattern between the first pinned pattern and the tunnel barrier pattern, and an exchange coupling pattern between the first pinned pattern and the second pinned pattern. The second pinned pattern includes magnetic patterns and non-magnetic patterns, which are alternately stacked. The first pinned pattern is a ferromagnetic pattern consisted of a ferromagnetic element.