Magnetic Memory Device Diffusion Barrier
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Solution Overview
Problem
Magnetic memory devices face challenges in achieving improved switching characteristics and thermal resistance during high-temperature manufacturing processes, particularly due to diffusion of oxygen and boron affecting the magnetic tunnel junction's performance.
Innovation Solution
The magnetic memory device incorporates a diffusion barrier pattern with hafnium, oxygen, and boron, and a non-magnetic pattern with tantalum, oxygen, and boron, both with controlled thicknesses of 1 Å to 15 Å, to prevent oxygen and boron diffusion into the free magnetic pattern, along with a capping pattern to maintain uniform oxygen and boron distribution, enhancing switching characteristics and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a magnetic tunnel junction pattern is used for high-speed and low-power memory devices, then switching speed and power consumption are improved, but thermal resistance during high-temperature manufacturing processes deteriorates due to diffusion of oxygen and boron
Solution Approach 1:
A diffusion barrier pattern comprising hafnium (Hf) is introduced as an intermediary layer between the magnetic tunnel junction pattern and the non-magnetic pattern containing boron. The Hf layer forms a diffusion barrier that prevents oxygen and boron from diffusing into the magnetic tunnel junction during high-temperature manufacturing processes, thereby maintaining thermal resistance while preserving the switching performance of the MTJ
Solution Approach 2:
The patent employs a composite structure combining multiple materials with different properties: hafnium oxide (HfOx) for diffusion barrier functionality, cobalt-iron-boron (CoFeB) for magnetic properties, and magnesium oxide (MgO) for tunnel barrier functionality. This composite material approach allows simultaneous optimization of thermal stability, magnetic switching characteristics, and manufacturing process compatibility
2Productivity
If the thickness of diffusion barrier pattern and non-magnetic pattern is reduced to 1 Å to 15 Å, then device integration density is improved, but manufacturing precision requirements increase due to controlled thickness constraints
Solution Approach 1:
The patent optimizes the thickness parameters of the diffusion barrier pattern (1-15 Å) and non-magnetic pattern (1-15 Å) to achieve a balance between integration density and manufacturability. By carefully controlling these thin layer thicknesses, the patent enables high integration density while maintaining sufficient tolerance for standard semiconductor manufacturing processes
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 configuration improves the switching characteristics and thermal resistance of the magnetic tunnel junction, ensuring consistent performance and reliability during high-temperature manufacturing processes by maintaining uniform oxygen and boron distribution within the device layers.
Implementation Method 1
a diffusion barrier pattern, a non-magnetic pattern and a capping pattern, which are sequentially stacked on a substrate. The diffusion barrier pattern may include a first non-magnetic metal and oxygen. The non-magnetic pattern may include a second non-magnetic metal and oxygen.
Implementation Method 2
A resistance value of the magnetic tunnel junction pattern may be changed depending on magnetization directions of the two magnetic layers. For example, the magnetic tunnel junction pattern may have a relatively high resistance value when the magnetization directions of the two magnetic layers are antiparallel to each other, and the magnetic tunnel junction pattern may have a relatively low resistance value when the magnetization directions of the two magnetic layers are parallel to each other.
Data Source
AI summary
A magnetic memory device includes a pinned magnetic pattern, a tunnel barrier pattern, a free magnetic pattern, a diffusion barrier pattern, a non-magnetic pattern and a capping pattern, which are sequentially stacked on a substrate. The diffusion barrier pattern includes a first non-magnetic metal and oxygen. The non-magnetic pattern includes a second non-magnetic metal and oxygen. An oxide formation energy of the first non-magnetic metal is lower than an oxide formation energy of the second non-magnetic metal.