MTJ Oxidation Control Layer Using MoCoFe for Low-Resistance Memory
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Solution Overview
Problem
The miniaturization of semiconductor devices poses challenges in maintaining low operating voltage and high integration, particularly in magnetic memory devices, where excessive oxidation can lead to increased resistance and degradation of magnetic tunnel junction structures.
Innovation Solution
Incorporating an oxidation control layer with a filter layer and an oxide layer, where the filter layer includes MoCoFe, to limit oxygen diffusion and prevent excessive oxidation, thereby maintaining the integrity of the magnetic tunnel junction structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the magnetic memory device is miniaturized to achieve high integration, then the device size is reduced, but the resistance increases and magnetic tunnel junction structure degrades due to excessive oxidation
Solution Approach 1:
An oxidation control layer is introduced as an intermediary between the magnetic tunnel junction structure and the external environment. This layer includes a filter layer (MoCoFe) and an oxide layer that work together to control oxygen diffusion, preventing excessive oxidation of the magnetic tunnel junction structure while allowing the device to be miniaturized for high integration
Solution Approach 2:
The oxidation control layer changes the oxygen diffusion parameters by using the filter layer with specific material composition (MoCoFe) and thickness (3-20 nm) to regulate the amount of oxygen reaching the magnetic tunnel junction structure. This parameter control allows miniaturization while maintaining structural integrity through controlled oxidation levels
2Use of energy by moving object
If the operating voltage is reduced to achieve low power consumption, then energy efficiency is improved, but the device requires better oxidation control to maintain performance
Solution Approach 1:
The oxidation control layer serves as a mediator that provides precise oxidation control, which is essential for maintaining magnetic tunnel junction structure performance at low operating voltages. The filter layer and oxide layer work together to create controlled oxidation conditions that enable low-voltage operation while preserving device integrity
Solution Approach 2:
The oxidation control layer uses composite material structure combining MoCoFe filter layer with oxide layer. This composite structure provides superior oxidation control precision compared to single-layer designs, enabling the device to operate at lower voltages while maintaining reliable performance
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
The oxidation control layer effectively reduces resistance and prevents degradation of the semiconductor device, ensuring reliable operation and maintaining the magnetic tunnel junction structure's performance even at high temperatures.
Implementation Method 1
the filter layer includes MoCoFe
Implementation Method 2
excessive oxidation can lead to increased resistance and degradation of magnetic tunnel junction structures
Data Source
AI summary
A semiconductor device including a substrate; a lower electrode on the substrate; a magnetic tunnel junction structure on the lower electrode, the magnetic tunnel junction structure including a pinned layer, a tunnel barrier layer, and a free layer which are sequentially stacked; an upper electrode on the magnetic tunnel junction structure; and an oxidation control layer between the free layer and the upper electrode, the oxidation control layer including at least one filter layer and at least one oxide layer, wherein the at least one filter layer includes MoCoFe.