Related Experiment Video
Updated: Feb 5, 2026
06:34
In vitro Reconstitution of Cytoskeletal Networks inside Phase Separated Giant Unilamellar Vesicles (GUVs)
Published on: June 20, 2025
1.9K
Giant resistive switching in mixed phase BiFeO
David Edwards1, Niall Browne1, Kristina M Holsgrove1
1School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK. a.kumar@qub.ac.uk.
Nanoscale
|September 12, 2018
Summary
Controlling interfaces in bismuth ferrite (BiFeO3) thin films using stress and electric fields enables tunable resistance states. This breakthrough offers significant changes in electrical resistance for advanced electronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thin Film Technology
Background:
- Highly-strained coherent interfaces between rhombohedral-like (R) and tetragonal-like (T) phases in BiFeO3 thin films exhibit enhanced electrical conductivity.
- Controlling these R-T interfaces is key to creating tunable resistance states in BiFeO3.
Purpose of the Study:
- To demonstrate controllable manipulation of BiFeO3 thin film microstructures and phase populations.
- To investigate the relationship between applied mechanical stress, electric fields, and resulting electrical resistance.
- To achieve large, reversible changes in resistance through microstructural modification.
Main Methods:
- Utilized atomistic simulations to predict thermodynamically stable microstructural changes.
- Applied combinations of mechanical stress (pressure) and electric fields to BiFeO3 thin films.
- Measured changes in electrical resistance resulting from induced microstructural transformations.
Main Results:
- Successfully altered local thin film phase microstructures and R-T interface densities in a predictable manner.
- Achieved reversible, metastable changes in microstructure by applying pressure and electric fields.
- Observed significant changes in electrical resistance, up to 108%.
Conclusions:
- Mechanical stress and electric fields provide a controllable pathway to tune BiFeO3 microstructures and resistance states.
- The observed resistance changes are comparable to those in Tunnelling Electro-Resistance (TER) devices.
- This work paves the way for novel electronic devices with tunable resistance properties.
Related Concept Videos
01:22Switching of BJT
865
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
865
02:39Phase Diagrams
50.3K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
50.3K
02:31Phase Transitions
23.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.2K
01:30Mixing Concrete
391
Concrete mixing ensures a homogenous blend where aggregates are well-coated with cement paste. Concrete mixing is typically done using two main types of mixers: batch and continuous. Batch mixers handle one batch at a time, thoroughly combining materials before discharging and receiving the next batch. In contrast, continuous mixers receive a steady flow of ingredients, mixing them consistently and discharging without interruption. Within batch mixers, tilting drum mixers mix with internal...
391
01:19Mixing Time
481
The concept of mixing time is significant in producing a uniform concrete mix with the required strength. The mixing period starts once all components are in the mixer. Initially, the mixer is charged with 10% of the water, followed by the consistent addition of solids and then 80% of the water. The remaining water is added later, within the first quarter of the mixing period. The minimum mixing time varies according to the mixer's capacity; for example, mixers with up to 1 cubic yard...
481
01:22Resistivity
4.6K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.6K