Magnetic Junction Oxygen Blocking Layer for STT-MRAM
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Solution Overview
Problem
Conventional spin transfer torque magnetic random access memories (STT-MRAMs) face challenges in achieving low switching current, sufficient thermal stability, and high magnetoresistance for improved switching and signal performance.
Innovation Solution
A magnetic junction structure is introduced, comprising a pinned layer, a nonmagnetic spacer layer, a free layer, an oxide layer, and at least one oxygen blocking layer, which enhances perpendicular magnetic anisotropy and reduces switching current, thereby improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MTJ structure is used, then device complexity is low, but switching current is high and thermal stability is insufficient
Solution Approach 1:
The magnetic junction is segmented into multiple functional layers including pinned layer, free layer, oxide layer, and oxygen blocking layer. Each layer performs a specific function to collectively improve thermal stability while managing device complexity through modular design.
Solution Approach 2:
The patent employs composite magnetic junction structures combining different magnetic materials (pinned layer, free layer) with oxide layers and oxygen blocking layers. This composite approach enhances thermal stability by creating synergistic effects among different materials while maintaining controllable device complexity.
2Reliability
If conventional MTJ structure is used, then manufacturing is simple, but magnetoresistance is low
Solution Approach 1:
The magnetic junction is divided into distinct functional segments including pinned layer, free layer, and oxide layer. This segmentation allows optimization of magnetoresistance in each layer while keeping the overall structure manageable through clear functional separation.
Solution Approach 2:
Composite structures combining magnetic layers with oxide layers and oxygen blocking layers are used to enhance magnetoresistance. The interaction between different materials in the composite structure creates higher magnetoresistance values than conventional single-structure MTJs.
3Use of energy by moving object
If conventional MTJ structure is used, then device structure is simple, but switching current is high
Solution Approach 1:
The magnetic junction is segmented into pinned layer, free layer, oxide layer, and oxygen blocking layer. This segmentation enables optimization of spin torque transmission and reduction of switching current while maintaining a structured approach to managing device complexity.
Solution Approach 2:
Composite magnetic junction structures with multiple functional layers are employed to reduce switching current. The combination of different materials and their interfaces enhances spin torque efficiency, allowing lower switching currents while the modular composite design keeps device complexity manageable.
4Stability of the object's composition
If oxygen blocking layer is added, then perpendicular magnetic anisotropy is improved, but device complexity increases
Solution Approach 1:
The magnetic junction is segmented with a dedicated oxygen blocking layer positioned adjacent to the oxide layer. This segmentation allows the oxygen blocking layer to specifically enhance perpendicular magnetic anisotropy while the modular design keeps overall device complexity manageable through clear functional separation.
Solution Approach 2:
The oxygen blocking layer acts as an intermediary between the oxide layer and other magnetic layers. It mediates oxygen diffusion and protects the magnetic layers, thereby improving perpendicular magnetic anisotropy while its position as an intermediary layer integrates it smoothly into the overall structure without excessive complexity.
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 magnetic junction structure achieves improved switching characteristics and thermal stability, leading to enhanced performance in STT-MRAMs by optimizing the magnetic anisotropy and switching current.
Implementation Method 1
The oxygen blocking layer(s) has a position selected from adjacent to the oxide layer and adjacent to the pinned layer
Implementation Method 2
The magnetic junction may have improved perpendicular magnetic anisotropy for the free and/or for pinned layers
Implementation Method 3
A spin polarized current driven through the magnetic junction exerts a spin torque on the magnetic moments in the magnetic junction
Data Source
AI summary
A magnetic junction and method for providing the magnetic junction are described. The magnetic junction resides on a substrate and is usable in a magnetic device. The magnetic junction includes a pinned layer, a nonmagnetic spacer layer, a free layer, an oxide layer and at least one oxygen blocking layer. The free layer is switchable between a plurality of stable magnetic states when a write current is passed through the magnetic junction. The nonmagnetic spacer layer is between the pinned layer and the free layer. The oxide layer is adjacent to the free layer. The free layer is between the nonmagnetic spacer layer and the oxide layer. The oxygen blocking layer(s) has a position selected from adjacent to the oxide layer and adjacent to the pinned layer. In some aspects, the magnetic junction may also include an oxygen adsorber layer and/or a tuning layer.