Related Experiment Video
Updated: Oct 26, 2025
09:49
In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
4.2K
Evaluating Ovonic Threshold Switching Materials with Topological Constraint Theory.
John C Read1, Derek A Stewart1, James W Reiner1
1Western Digital Corporation, 5601 Great Oaks Pkwy, San Jose, California 95119, United States.
ACS Applied Materials & Interfaces
|August 2, 2021
Summary
Topological Constraint Theory explains ovonic threshold switching (OTS) material properties. Mean coordination number reveals transitions in glass networks, enabling optimization of OTS selectors for nonvolatile memory.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Ovonic threshold switching (OTS) materials are crucial for nonvolatile memory selectors.
- Understanding their physical properties is key to improving device performance.
Purpose of the Study:
- To apply Topological Constraint Theory (TCT) to describe the physical properties of sputtered thin-film OTS materials.
- To establish a framework for optimizing OTS materials for electronic devices.
Main Methods:
- Utilized Topological Constraint Theory (TCT) for analysis.
- Employed mean coordination number (MCN) as a metric for glass network structure.
- Analyzed data trends from various measurements on sputtered thin films.
Main Results:
- TCT successfully describes the physical properties of OTS materials and devices.
- Changes in MCN indicate transitions between floppy and rigid glass networks.
- Film-level measurements correlate with TCT predictions.
Conclusions:
- TCT provides a robust framework for understanding OTS material behavior.
- MCN is a valuable indicator for optimizing OTS selector materials.
- This approach facilitates the development of advanced nonvolatile memory.
Related Concept Videos
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.4K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.4K
01:27Electrostatic Boundary Conditions in Dielectrics
1.5K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.5K
01:25Yield Criteria for Ductile Materials under Plane Stress
265
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
265
01:20Tonicity in Plants
31.6K
Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
31.6K
01:17Theory of Metallic Conduction
1.5K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.5K
01:27Biasing of Metal-Semiconductor Junctions
383
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
383