Molecular Memory Using Metal Ion Radius for Controllable Recordkeeping Time
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Solution Overview
Problem
Molecular metal oxide clusters described in existing patents are not versatile enough to be applied effectively to various types of memories, such as volatile, non-volatile, and storage class memories, limiting their practical use.
Innovation Solution
A molecular memory system utilizing a single-molecule electret layer with a cluster skeleton having stable ionic sites and a movable metal ion, where the metal ion's movement between sites under an electric field allows for controllable polarization, enabling the memory to function as any of volatile, non-volatile, or storage class memory based on recordkeeping time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a molecular metal oxide cluster is used as a single-molecule electret, then spontaneous polarization and P-E hysteresis are achieved, but the recordkeeping time is limited and cannot be controlled across different memory types
Solution Approach 1:
The patent changes the parameter of metal ion radius to control recordkeeping time. By selecting different metal ions with varying radii (e.g., smaller ions like Li+ for volatile memory, larger ions like Cs+ for non-volatile memory), the relaxation time of molecular polarization is adjusted, enabling the same molecular metal oxide cluster structure to serve different memory types with different recordkeeping requirements.
Solution Approach 2:
The patent achieves multi-functionality by designing a universal molecular metal oxide cluster structure that can function across different memory types. The cluster maintains its core structure while allowing different metal ions to be incorporated, making it versatile for volatile memory, non-volatile memory, and storage class memory applications.
2Speed
If the metal ion radius is decreased to increase response speed, then volatile memory performance is improved, but recordkeeping time becomes too short for non-volatile memory
Solution Approach 1:
The patent systematically varies the metal ion radius parameter to achieve different response speeds and recordkeeping times. Smaller metal ions (e.g., Li+, Na+) provide faster response speeds suitable for volatile memory, while larger metal ions (e.g., K+, Cs+) provide longer recordkeeping times suitable for non-volatile memory, allowing optimization for specific application requirements.
3Duration of action of moving object
If the metal ion radius is increased to extend recordkeeping time, then non-volatile memory is achieved, but response speed decreases
Solution Approach 1:
The patent utilizes the parameter of metal ion radius to control the balance between recordkeeping time and response speed. Larger metal ions increase the relaxation time of molecular polarization, extending recordkeeping time for non-volatile memory applications, while accepting the trade-off of reduced response speed.
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 molecular memory achieves a wide range of recordkeeping times from seconds to centuries, making it suitable for various memory types, with temperature control allowing different response speeds and stability, enhancing its applicability to electronic devices.
Implementation Method 1
the molecular polarization is changed by movement of the metal ion to the other hollow stable ionic site by application of an electric field
Implementation Method 2
the single-molecule electret shows the P-E hysteresis and the spontaneous polarization based on a slow polarization relaxation phenomenon
Data Source
AI summary
A molecular memory recording molecular polarization of a single-molecule electret, and the single-molecule electret includes a cluster skeleton 100 having a continuous hole 101 and a plurality of stable ionic sites 102a, 102b and a metal ion M. The molecular polarization is shown in a state in which the metal ion is included in the stable ionic site. The molecular polarization is changed by movement of the metal ion to the other hollow stable ionic site by application of an electric field. The recordkeeping time of the molecular memory in a temperature range of −100° C. to 100° C. based on the ion radius of the metal ion is 3.0×10−2 seconds to 9.1×1022 seconds. Based on the recordkeeping time, the molecular memory is used as any of a volatile memory, a non-volatile memory, and a storage class memory.