Spin Accumulation Logic Device for Multi-Function Gate
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Solution Overview
Problem
Current semiconductor logic circuits face challenges in reducing size and achieving multi-functionality due to physical limitations of existing MOSFET-based devices, making it difficult to configure complex logic circuits with small device areas.
Innovation Solution
A spin element-based logic device that utilizes spin information transferred from ferromagnetic materials to implement multi-functional logic gates by changing the magnetization direction of output terminal patterns and reference voltage, allowing for the implementation of AND, OR, NOR, and NAND gates with a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MOSFET-based logic circuits are used to achieve multi-functionality, then the device structure becomes extremely complicated, but the device area cannot be reduced
Solution Approach 1:
The patent implements a single logic device structure that can perform multiple logic gate functions (AND, OR, NOR, NAND) by changing the magnetization direction of the output terminal pattern and adjusting the reference voltage, eliminating the need for separate dedicated circuits for each logic function
Solution Approach 2:
The patent changes the magnetization direction parameter of the ferromagnetic material in the output terminal pattern to switch between different logic gate functions, and adjusts the reference voltage parameter to define the output logic level, enabling multi-functionality without structural changes
2Adaptability or versatility
If existing MOSFET logic circuits are configured for specific calculations, then the logic circuit can perform the specific function, but the device area becomes extremely large
Solution Approach 1:
A single compact logic device structure performs all four basic logic gate functions (AND, OR, NOR, NAND) through parameter changes, replacing what would traditionally require four separate dedicated logic circuit blocks
Solution Approach 2:
The patent merges multiple logic gate functions into a single integrated device structure using ferromagnetic material patterns and spin transport mechanisms, combining the functionality of separate AND, OR, NOR, and NAND gates into one compact unit
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
Enables the realization of multi-functional logic circuits with reduced device area by controlling both electronic charges and spin information, overcoming the limitations of traditional semiconductor devices.
Implementation Method 1
An output voltage is read from the output terminal pattern by using spin accumulation and diffusion of electrons which are injected into the channel layer from the input terminal patterns
Implementation Method 2
The output terminal pattern of ferromagnetic material may detect spin information obtained as electron spin is accumulated under the two input terminal patterns and diffused to the output terminal through a channel so as to be added
Data Source
AI summary
A logic device includes: a substrate having a channel layer; two input terminal patterns of ferromagnetic material formed on the substrate and spaced apart from each other along a longitudinal direction of the channel layer so as to serve as the input terminals of a logic gate; and an output terminal pattern of ferromagnetic material formed on the substrate and disposed between the two input terminal patterns to serve as an output terminal of the logic gate. The output terminal pattern reads an output voltage by using spin accumulation and diffusion of electron spins which are injected into the channel layer from the input terminal patterns.