Oxidized Non-Magnetic Barrier for Magnetic Memory Oxygen Diffusion
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Solution Overview
Problem
Magnetic tunnel junctions in memory devices face challenges with variations in oxygen diffusion during thermal treatments, leading to deteriorated magnetic characteristics and inconsistent switching currents due to differences in oxygen amounts across multiple junctions.
Innovation Solution
Incorporating a non-magnetic pattern with a non-metallic element like boron, which can bond with oxygen, preventing its diffusion into the magnetic layer and reducing variations in switching currents by using boron-containing metal oxides like TaBOx as an oxidized non-magnetic pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal treatment is applied to magnetic tunnel junctions, then magnetic characteristics can be improved, but oxygen diffusion occurs leading to deteriorated magnetic characteristics and inconsistent switching currents
Solution Approach 1:
An oxidized non-magnetic pattern layer is introduced as an intermediary between the magnetic pattern and the electrode. This layer includes a non-metallic element (such as boron) that acts as a diffusion barrier to oxygen, preventing oxygen from diffusing into the magnetic pattern during thermal treatment. The layer is positioned to intercept oxygen diffusion paths while maintaining the beneficial magnetic characteristics achieved through thermal treatment.
Solution Approach 2:
The oxidized non-magnetic pattern is formed as a composite material containing both a metallic element (such as tantalum) and a non-metallic element (such as boron). This composite structure provides both the structural integrity needed for thermal treatment and the oxygen diffusion barrier properties. The metallic element forms the base layer while the non-metallic element creates oxide compounds that block oxygen diffusion.
2Reliability
If oxygen diffusion is prevented in magnetic layers, then magnetic characteristics are maintained, but switching current variations increase due to oxygen amount differences
Solution Approach 1:
The oxidized non-magnetic pattern serves as a controlled intermediary layer that regulates oxygen distribution. By positioning this layer between the magnetic pattern and electrode, it creates a defined oxygen barrier that prevents uncontrolled oxygen diffusion. This leads to more uniform oxygen amounts across multiple magnetic tunnel junctions, reducing switching current variations while preserving magnetic characteristics.
Solution Approach 2:
The oxidation state and composition of the non-magnetic pattern are carefully controlled to optimize oxygen diffusion prevention. By adjusting the ratio of metallic to non-metallic elements and controlling the oxidation process, the layer's oxygen barrier properties are tuned to achieve consistent oxygen distribution across devices, thereby improving switching current uniformity.
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 enhances magnetic characteristics and reduces variations in switching currents between magnetic tunnel junctions, improving reliability and consistency in memory device performance.
Implementation Method 1
a non-metallic element having a standard free energy of oxide formation that is less than about that of a standard free energy of oxide formation of Fe
Implementation Method 2
An oxidized non-magnetic pattern can be located between the first magnetic structure and the first electrode
Data Source
AI summary
A magnetic memory device can include a first electrode and a first magnetic structure that is spaced apart from the first electrode, where the first magnetic structure can include a magnetic pattern therein. An oxidized non-magnetic pattern can be located between the first magnetic structure and the first electrode, where the oxidized non-magnetic pattern can include a non-metallic element having a standard free energy of oxide formation that is less than about that of a standard free energy of oxide formation of Fe.