MRAM Multi-Resistance Cell Control for Higher Storage Density
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Solution Overview
Problem
Existing magnetoresistive random access memory (MRAM) technologies face limitations in increasing memory capacity in a space-saving manner, despite methods to introduce additional resistance states, as the memory capacity remains insufficient under various conditions.
Innovation Solution
A storage device and method that enables a magnetoresistive storage element to change to at least four identifiable resistance states by altering its magnetization direction or applying a blow current, utilizing a magnetoresistive element with a configuration that includes a base layer, magnetization fixed layer, tunnel barrier layer, and storage layer, allowing for multi-value data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a blow current is used to change the state of the tunnel barrier layer to add a new resistance state, then memory capacity increases, but the memory capacity is still insufficient under various usage conditions
Solution Approach 1:
The patent changes the magnetization direction parameter of the storage layer to create multiple stable resistance states. By controlling the magnetization orientation (parallel, antiparallel, and intermediate states) between the storage layer and reference layer, the system achieves at least four identifiable resistance states, enabling multi-value data storage and significantly increasing memory capacity without adding physical storage elements
Solution Approach 2:
The patent introduces dynamic control of the tunnel barrier layer's resistance state through blow currents of varying magnitudes. By applying different current thresholds, the system can transition between multiple resistance states (first resistance state with low current, second resistance state with high current), enabling the storage element to represent multiple values dynamically based on the applied current magnitude
2Quantity of substance
If the magnetoresistive storage element is changed to at least four identifiable resistance states, then memory capacity increases in a space-saving manner, but the complexity of controlling and identifying these states increases
Solution Approach 1:
The system uses the magnitude of the applied blow current itself as the control parameter to determine the resistance state. The storage element automatically transitions to different resistance states based on the current threshold, and the read circuit identifies the state by measuring the resistance. This self-regulating mechanism based on current magnitude simplifies the control logic compared to requiring separate control signals for each state transition
Solution Approach 2:
The patent changes the magnetization direction parameter of the storage layer to create multiple stable resistance states. By controlling the magnetization orientation (parallel, antiparallel, and intermediate states) between the storage layer and reference layer, the system achieves at least four identifiable resistance states, enabling multi-value data storage and significantly increasing memory capacity without adding physical storage 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
The proposed solution increases the storage capacity by enabling a storage device capable of multi-value data storage.
Implementation Method 1
A magnetoresistive storage element that can be changed to at least four identifiable resistance states
Implementation Method 2
changes a magnetization direction of the magnetoresistive storage element
Implementation Method 3
causing a blow current to flow through the magnetoresistive storage element
Data Source
AI summary
A storage device according to an embodiment of the present disclosure includes a magnetoresistive storage element that changes to at least four identifiable resistance states, and a write unit that changes the magnetoresistive storage element into the at least four identifiable resistance states by changing a magnetization direction of the magnetoresistive storage element or causing a blow current to flow through the magnetoresistive storage element.