Ferromagnetic CMOS Logic Circuits With Nonvolatile Output States
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Solution Overview
Problem
Conventional transistor-based logic gates are volatile, requiring continuous power to maintain logical operations, which leads to increased power consumption and inefficiency.
Innovation Solution
The use of ferromagnetic elements with transistors to perform logical operations, where the magnetization direction of one ferromagnetic element influences another, allowing non-volatile digital output maintenance without electrical power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional transistor-based logic gates are used, then logical operations can be performed, but continuous power is required to maintain the output, leading to increased power consumption
Solution Approach 1:
The patent replaces the conventional electrical field-based transistor operation with a magnetic field-based ferromagnetic element system. The ferromagnetic elements use magnetization states (influenced by spin-polarized current) to represent and maintain logical states, substituting the electrical voltage maintenance mechanism with a magnetic state retention mechanism that does not require continuous power.
Solution Approach 2:
The patent changes the fundamental parameter used to represent logical states from electrical voltage (in transistors) to magnetization direction (in ferromagnetic elements). This parameter change enables non-volatile storage of logical states, as the magnetization direction can be maintained without continuous power supply, thereby reducing power consumption while maintaining reliability.
2Reliability
If additional memory elements are used to maintain logical operation output, then non-volatility is achieved, but device complexity increases
Solution Approach 1:
The patent merges the logic gate functionality and memory functionality into a single integrated circuit structure. The ferromagnetic elements serve dual purposes: they perform the logical operation (AND, OR, NOT gates) and simultaneously store the result non-volatily through their magnetization states. This eliminates the need for separate memory elements, reducing device complexity while achieving non-volatility.
Solution Approach 2:
The ferromagnetic elements in the patent are designed to perform multiple functions: they act as both the computational element (performing logical operations through their magnetic interaction) and the storage element (retaining the logical state non-volatily). This multi-functionality reduces the overall number of components needed compared to conventional architectures that require separate logic and memory elements.
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 results in non-volatile logic circuits that reduce power consumption and enable faster system speeds by maintaining digital output values without power, while being compatible with existing CMOS devices and fabrication processes.
Implementation Method 1
The input current influences the magnetization direction of the input ferromagnetic element, which, in turn, influences the magnetization direction of the output ferromagnetic element
Data Source
AI summary
Apparatus and related fabrication and operating methods are provided for logic circuits that include ferromagnetic elements. An exemplary logic circuit includes a first ferromagnetic element having a first ferromagnetic layer, a second ferromagnetic element having a second ferromagnetic layer, and a transistor coupled to the first ferromagnetic element. The first transistor is configured to allow current to flow through the first ferromagnetic element. The current influences the magnetization direction of the first ferromagnetic layer, which, in turn, influences the magnetization direction of the second ferromagnetic layer.