Magnetic Memory Load Resistance Unit Unidirectional Current Control
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Solution Overview
Problem
Current magnetic memory and semiconductor-integrated-circuit technologies face challenges in achieving higher integration due to the need for bidirectional current flow, which increases circuit complexity and resistance, hindering the flow of large currents and reducing integration density.
Innovation Solution
The implementation of a magnetic memory and semiconductor-integrated-circuit design that utilizes a magnetoresistive device with a load resistance unit and a controller to switch between resistance states using unidirectional current, eliminating the need for bidirectional current flow and reducing peripheral circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bidirectional current flow is used to switch resistance states, then the magnetoresistive device can be controlled, but the circuit complexity and resistance increase
Solution Approach 1:
The patent extracts the bidirectional current requirement from the control mechanism and replaces it with unidirectional current flow. The load resistance unit is configured to provide different resistance values based on the state of the magnetoresistive device, eliminating the need for bidirectional current while maintaining full control capability.
Solution Approach 2:
The load resistance unit acts as an intermediary element that mediates the control process. By providing different resistance values (first resistance value and second resistance value) corresponding to different states of the magnetoresistive device, it enables state control through unidirectional current alone, without requiring bidirectional current flow.
2Ease of operation
If bidirectional current flow is used, then resistance states can be switched, but large current flow is hindered
Solution Approach 1:
The patent removes the bidirectional current requirement that limits current flow capacity. By using unidirectional current with a load resistance unit that provides state-dependent resistance values, the system can support large current flows while maintaining state switching capability.
3Ease of operation
If peripheral circuits are added for bidirectional current control, then state switching is enabled, but integration density decreases
Solution Approach 1:
The patent extracts and eliminates the need for complex peripheral circuits required for bidirectional current control. The load resistance unit integrated into the memory cell provides state-dependent resistance, enabling control through simple unidirectional current flow and reducing overall circuit scale.
Solution Approach 2:
The load resistance unit is merged with the memory cell structure, combining the functionality of state-dependent resistance control within the same cell. This integration eliminates separate peripheral control circuits and improves integration density.
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 allows for higher integration and efficient current flow, enabling larger currents to be provided while reducing circuit scale and enhancing integration density, thus facilitating more compact and efficient magnetic memory and semiconductor-integrated-circuit designs.
Implementation Method 1
The magnetoresistive device has a first resistance state and a second resistance state and includes a first ferromagnetic layer and a second ferromagnetic layer. A direction of magnetization of the first ferromagnetic layer is changeable.
Data Source
AI summary
A magnetic memory includes a magnetoresistive device and a load resistance unit. The magnetoresistive device has a first resistance state and a second resistance state and includes a first ferromagnetic layer and a second ferromagnetic layer. The load resistance unit is electrically connected to the magnetoresistive device. The load resistance unit is in a first state and a second state. Differential resistance of the load resistance unit at the second state is lower than differential resistance of the load resistance unit at the first state.