Oxygen-Deficient Magnetic Tunnel Junctions for Fast Low-Resistance Switching
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Solution Overview
Problem
Existing magnetic tunneling junction devices face challenges in maintaining low resistance and high durability while achieving fast operation speeds due to issues with oxygen and nitrogen diffusion affecting the free layer, which increases resistance and decreases switching efficiency.
Innovation Solution
The manufacturing method involves forming a first oxide layer with a stoichiometrically oxygen-deficient composition, using a cryogenic cooling process, and incorporating a wetting layer to trap oxygen and nitrogen atoms, thereby preventing their diffusion into the free layer, and using metal elements with high oxygen affinity to dope the second magnetic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing methods are used without oxygen-deficient oxide layer, then manufacturing process is simpler, but oxygen and nitrogen diffuse into free layer causing increased resistance and decreased switching efficiency
Solution Approach 1:
The oxide layer is prepared with an oxygen-deficient composition before the free layer is formed. This preliminary action creates a protective environment that prevents oxygen and nitrogen diffusion into the free layer during subsequent manufacturing steps, thereby maintaining low resistance and high switching efficiency without requiring complex post-processing
Solution Approach 2:
The oxide layer with oxygen-deficient composition acts as an intermediary barrier between the external environment and the free layer. This intermediary structure traps oxygen and nitrogen atoms, preventing them from reaching and degrading the free layer, thus protecting the device performance while maintaining manufacturing feasibility
2Stability of the object's composition
If cryogenic cooling process is used to form oxide layer, then oxygen and nitrogen diffusion is prevented improving resistance stability, but manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The oxide layer is formed with specific compositional parameters (oxygen-deficient stoichiometry) rather than relying solely on temperature control. This parameter change allows the layer to inherently resist oxygen and nitrogen diffusion at standard manufacturing temperatures, achieving resistance stability without requiring continuous cryogenic cooling during fabrication
Solution Approach 2:
The oxide layer is prepared in advance with the correct oxygen-deficient composition before subsequent manufacturing steps. This preliminary preparation ensures that the layer has the necessary properties to prevent diffusion during later processing, reducing the need for complex temperature control measures during fabrication
3Reliability
If metal elements with high oxygen affinity are not used to dope second magnetic layer, then doping process is simpler, but perpendicular magnetic anisotropy and switching efficiency are reduced
Solution Approach 1:
Metal elements with high oxygen affinity (such as Fe, Co, Ni, or their alloys) are introduced into the second magnetic layer to modify its magnetic properties. This compositional parameter change enhances perpendicular magnetic anisotropy and switching efficiency by promoting favorable magnetic moment alignment and interaction with the oxide layer
Solution Approach 2:
The second magnetic layer is formed as a composite material combining magnetic metals (Fe, Co, Ni, or their alloys) with the oxide layer. This composite structure leverages the high oxygen affinity of the metal elements to strengthen magnetic coupling and perpendicular anisotropy, achieving improved switching efficiency through material composition rather than complex processing
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 the stability and operation speed of the magnetic tunneling junction device by maintaining low resistance and reducing the likelihood of resistance area increase, improving switching efficiency and perpendicular magnetic anisotropy.
Implementation Method 1
the oxide layer having a stoichiometrically oxygen-deficient composition may trap oxygen and/or nitrogen atoms
Implementation Method 2
the oxide layer having a stoichiometrically oxygen-deficient composition may trap oxygen and/or nitrogen atoms
Implementation Method 3
incorporating a wetting layer to trap oxygen and nitrogen atoms, thereby preventing their diffusion into the free layer
Implementation Method 4
The oxygen affinity of the metal element of the second magnetic layer may be greater than that of the magnetic material of the second magnetic layer
Implementation Method 5
The resistance of a magnetic tunneling junction device varies with the magnetization direction of a free layer
Data Source
Figure 1~2A
Figure 2B~2C
Figure 2D~2E
AI summary
Provided are magnetic tunneling junction devices, memory devices including the magnetic tunneling junction devices, and methods of manufacturing the magnetic tunneling junction devices. The magnetic tunneling junction device (200) includes a first magnetic layer (201); a second magnetic layer (205) disposed to face the first magnetic layer; and a first oxide layer (202) disposed between the first magnetic layer and the second magnetic layer and including a metal oxide, wherein the metal oxide of the first oxide layer has a stoichiometrically oxygen-deficient composition, and wherein the second magnetic layer includes a magnetic material doped with a metal element.