Magnetic Memory Wiring with Carbon Barrier Layer
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Solution Overview
Problem
Magnetic memory devices face challenges in integrating magnetoresistance effect elements and selectors on semiconductor substrates, particularly in preventing leakage and maintaining low resistance in wiring lines while ensuring proper operation of the selector and magnetoresistance effect elements.
Innovation Solution
The magnetic memory device incorporates a first conductive layer of metal material like tungsten and a second conductive layer of carbon, with the carbon layer preventing metal attachment to the selector's side surface during etching and reducing resistance, and the selector and magnetoresistance effect elements are stacked with a middle electrode and hard mask to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal conductive layer is used for wiring lines, then electrical conductivity is improved, but metal material attaches to the selector's side surface during etching causing leakage
Solution Approach 1:
A carbon-based protective layer is introduced as an intermediary between the metal conductive layer and the selector. This carbon layer serves as a barrier during the etching process, preventing metal material from attaching to the selector's side surface while allowing the metal layer to maintain its electrical conductivity function.
Solution Approach 2:
The carbon-based protective layer, which may be considered an additional material layer, converts the potential harm of metal attachment into a beneficial configuration. The carbon layer prevents harmful metal deposition on the selector while the underlying metal conductive layer maintains its electrical function, effectively turning a potential defect into a design feature.
2Reliability
If wiring line resistance is reduced, then signal transmission is improved, but leakage increases
Solution Approach 1:
The carbon-based protective layer acts as an intermediary that enables the use of metal conductive materials with lower resistance while preventing leakage. The carbon layer serves as an effective barrier that blocks leakage paths, allowing the metal layer to provide low resistance signal transmission without the usual leakage drawbacks.
3Reliability
If multiple conductive layers are added to wiring lines, then resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The carbon-based protective layer is introduced as an intermediary layer between conductive layers. This additional layer, while increasing structural complexity, serves the dual function of preventing metal attachment to selectors and enabling lower resistance wiring lines, thereby justifying the increased manufacturing steps through improved electrical 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
This configuration effectively suppresses leakage and lowers the resistance of the wiring lines, resulting in a magnetic memory device with improved characteristics for data storage and operation.
Implementation Method 1
the carbon layer preventing metal attachment to the selector's side surface during etching
Implementation Method 2
reducing resistance
Data Source
AI summary
According to one embodiment, a magnetic memory device includes a first wiring line extending in a first direction, a second wiring line provided on an upper layer side of the first wiring line and extending in a second direction intersecting the first direction, and a memory cell provided between the first wiring line and the second wiring line and including a magnetoresistance effect element and a switching element which are stacked in a third direction intersecting the first direction and the second direction. The first wiring line includes a first conductive layer and a second conductive layer provided on the first conductive layer and formed of a material containing carbon (C).