Magnetic Memory Electrode Structure for Impurity Diffusion Blocking
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Solution Overview
Problem
Existing magnetic memory devices face challenges in maintaining the integrity of magnetoresistance effect elements due to impurity diffusion and surface roughness affecting the magnetization fixing force of synthetic antiferromagnetic structures, which degrades the performance and reliability of data storage.
Innovation Solution
Incorporating a non-magnetic layer with an amorphous structure, containing metal oxide or metal nitride, to mitigate the influence of underlying layers on the crystal structure and suppress impurity diffusion, thereby improving the magnetization fixing force and magnetic properties of the magnetoresistance effect element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional non-magnetic layer is used in the electrode structure, then the device can be manufactured with standard materials, but impurity diffusion occurs from underlying layers to the magnetoresistance effect element, degrading magnetic properties and data retention
Solution Approach 1:
The patent introduces an amorphous non-magnetic layer as an intermediary barrier between the underlying layers and the magnetoresistance effect element. This intermediate layer specifically suppresses impurity diffusion while maintaining electrical functionality, thereby protecting the magnetic properties and improving data retention without requiring complete structural redesign
Solution Approach 2:
The patent changes the structural parameter of the non-magnetic layer from crystalline to amorphous state. This parameter change fundamentally alters the layer's properties, enabling it to effectively block impurity diffusion pathways while maintaining electrical conductivity and magnetic compatibility, thus resolving the reliability issue
2Manufacturing precision
If the crystal structure of underlying layers is maintained, then manufacturing is straightforward, but surface roughness and impurity diffusion affect the magnetization fixing force of synthetic antiferromagnetic structures
Solution Approach 1:
The amorphous non-magnetic layer serves as a mediator that decouples the crystal structure requirements of underlying layers from the magnetic property requirements at the magnetoresistance interface. This allows standard manufacturing of underlying layers while achieving precise control over the interface properties through the amorphous barrier layer
Solution Approach 2:
By changing the structural parameter of the non-magnetic layer to amorphous state, the patent achieves superior surface smoothness and impurity blocking without requiring complex manufacturing processes for the underlying layers. The amorphous structure naturally provides a smooth interface that enhances magnetization fixing force
3Reliability
If a crystalline non-magnetic layer is used, then the layer provides good electrical conductivity, but it allows impurity diffusion and maintains surface roughness that degrades magnetic properties
Solution Approach 1:
The patent changes the structural parameter of the non-magnetic layer from crystalline to amorphous. This parameter change fundamentally improves impurity blocking capability while maintaining electrical conductivity through the amorphous phase, which has lower diffusion coefficients for impurities and provides a smoother surface for magnetic layer deposition
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
Enhances the magnetization fixing force of the synthetic antiferromagnetic structure, leading to improved data retention and reliability in magnetic memory devices by reducing impurity diffusion and maintaining optimal magnetic properties.
Implementation Method 1
the second non-magnetic layer has an amorphous structure and contains a metal oxide or a metal nitride, thereby mitigating the influence of layers located below the second non-magnetic layer on a crystal structure and suppressing diffusion of impurities into the magnetoresistance effect element
Implementation Method 2
A memory device using a magnetoresistance effect element as a storage element is known
Implementation Method 3
the electrode includes: a first non-magnetic layer being in contact with the switching element; and a second non-magnetic layer provided on a side opposite to a side on which the switching element is provided with respect to the first non-magnetic layer
Data Source
AI summary
According to one embodiment, a magnetic memory device includes a memory cell. The memory cell includes a switching element, a magnetoresistance effect element, and an electrode that electrically couples the switching element to the magnetoresistance effect element. The electrode includes: a first non-magnetic layer being in contact with the switching element; and a second non-magnetic layer provided on a side opposite to a side on which the switching element is provided with respect to the first non-magnetic layer. The second non-magnetic layer has an amorphous structure and contains a metal oxide or a metal nitride.