Unipolar Selectors for MTJ Memory Cell Miniaturization
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Solution Overview
Problem
Existing access apparatuses for magnetic tunnel junction (MTJ) devices in memory arrays are either too large due to high voltage and current requirements or fail to maintain speed and endurance advantages, limiting the miniaturization of memory cells.
Innovation Solution
The use of a plurality of unipolar selectors, which allow current to flow in a single direction during normal operation, collectively enabling access to MTJ devices along opposing directions, thereby facilitating efficient data writing and reading while maintaining a small cell size and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional access apparatuses are used for MTJ devices, then current flow capability is achieved, but device size becomes too large due to high voltage and current requirements
Solution Approach 1:
The access apparatus is divided into multiple unipolar selectors (first unipolar selector and second unipolar selector) that work together to control current flow through the MTJ device. Each selector handles a specific direction of current flow, allowing the system to achieve bipolar control functionality while using smaller unipolar components instead of a single large bipolar access apparatus.
Solution Approach 2:
The patent changes the operating parameters by using unipolar selectors with lower voltage and current requirements compared to conventional bipolar access apparatuses. The unipolar selectors operate with reduced electrical stress parameters, enabling smaller device size while maintaining the necessary current flow capability through the MTJ device in both directions.
2Area of moving object
If unipolar selectors are used to reduce access apparatus size, then memory cell miniaturization is achieved, but current flow in opposing directions must be enabled through multiple selectors
Solution Approach 1:
The access apparatus is segmented into multiple unipolar selectors, each responsible for a specific current direction. The first unipolar selector allows current flow in one direction while the second unipolar selector allows current flow in the opposite direction. This segmentation enables the use of smaller unipolar components to achieve the functionality of a single larger bipolar access apparatus.
Solution Approach 2:
Multiple unipolar selectors are combined to form a functional access apparatus that can control current flow in both directions through the MTJ device. The first and second unipolar selectors are electrically connected and work together as a unified access mechanism, merging the capabilities of individual unipolar selectors to achieve bipolar control functionality.
3Ease of operation
If conventional access apparatuses are used, then data writing and reading operations are performed, but power rail complexity increases due to high voltage requirements
Solution Approach 1:
The patent changes the voltage and current parameters required for data writing and reading operations by using unipolar selectors. The unipolar selectors operate with lower voltage requirements compared to conventional bipolar access apparatuses, thereby reducing the complexity of power rail configurations. The memory array can use simplified power supply arrangements while maintaining full data access functionality.
Data Source
AI summary
In some embodiments, the present disclosure relates to an integrated chip. The integrated chip includes a memory device disposed within an inter-level dielectric (ILD) structure over a substrate. The memory device has a data storage structure between a first electrode and a second electrode. A first unidirectional current controller and a second unidirectional current controller are disposed within the ILD structure. A conductor arranged between the first unidirectional current controller and the data storage structure along a first conductive path and further arranged between the second unidirectional current controller and the data storage structure along a second conductive path. A part of the first conductive path overlaps a part, but not all, of the second conductive path.