Oxygen vacancy induced electrical conductivity enhancement in Ca-doped BiFeO3 thin films
Source abstract
Abstract
Bismuth ferrite, recognized for its exceptional physical properties as a multiferroic material, has recently attracted considerable attention due to its high domain wall conduction. However, challenges in further improving domain wall conductivity and magnetoelectric coupling hamper the practical application of pure-phase BFO thin films. Addressing these limitations, we successfully synthesized Bi 1-xCa xFeO 3 thin films on LaAlO₃ (001) substrates with varied calcium (Ca) doping levels (x = 0–0.3) through pulsed laser deposition. Our experimental data demonstrate a direct relationship between the films` electrical conductivity and the prevalence of oxygen vacancies (O V). An upward trend in both O V density and electrical conductivity emerges with incremental Ca doping, peaking at x = 0.2. Beyond this doping threshold, a further increase in Ca concentration inversely affects O V density and electrical conductivity. These insights suggest that fine-tuning O V concentration in Ca-doped BFO thin films can significantly modulate their electrical properties, paving the way for the advancement of bismuth ferrite-based electronic devices.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Multiferroics and related materials · Transition Metal Oxide Nanomaterials · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
Show source-provided references
1. Oxygen stoichiometry, superconductivity and normal-state properties of YBa2Cu3O7–δ10.1038/329423a0 ↗
2. Lattice effects, stability under a high magnetic field, and magnetotransport properties of the charge-ordered mixed-valence La0.35Ca0.65MnO3 perovskite10.1103/PhysRevB.56.8252 ↗
3. Suppression of metal-insulator transition in VO2 by electric field–induced oxygen vacancy formation10.1126/science.1230512 ↗
4. Resistive switching phenomena: A review of statistical physics approaches10.1063/1.4929512 ↗
5. The impact of oxygen partial pressure in modifying energy storage property of lanthanum doped multiferroic bismuth ferrite thin films deposited via pulsed laser deposition10.1016/j.est.2023.108179 ↗
6. Investigations on low temperature magnetic and magnetoelectric properties of multiferroic-NiO nanocomposites10.1016/j.jallcom.2023.171353 ↗
7. Room-temperature ferromagnetism in Gd and Sn co-doped bismuth ferrite nanoparticles and co-doped BiFeO3/MXene (Ti3C2) nanohybrids for spintronics applications10.1016/j.ceramint.2020.08.072 ↗
8. Ferromagnetic properties of conducting filament nanodots formed on epitaxial BiFeO3 thin film10.1016/j.jmrt.2022.03.114 ↗
9. Effective strategy for optimizing the leakage current and ferroelectric polarization characteristics of BiFeO3_PVDF-TrFE nanocomposite films10.1016/j.ceramint.2021.04.276 ↗
10. Tailoring the electrical conductivity and hardening in BiFeO3 ceramics10.1016/j.jeurceramsoc.2020.06.037 ↗
11. Exotic quad-domain textures and transport characteristics of self-assembled BiFeO3 nanoislands on Nb-doped SrTiO310.1021/acsami.0c19652 ↗
12. Controllable electrical, magnetoelectric and optical properties of BiFeO3 via domain engineering10.1016/j.pmatsci.2022.100943 ↗
13. Domain-wall engineering and topological defects in ferroelectric and ferroelastic materials10.1038/s42254-020-0235-z ↗
14. Oxygen vacancies nucleate charged domain walls in ferroelectrics10.1103/PhysRevLett.127.117601 ↗
15. Charged domain Walls in BaTiO3 crystals emerging from superdomain boundaries10.1002/aelm.202300005 ↗
16. Domain wall-localized phonons in BiFeO3: spectrum and selection rules10.1038/s41524-020-0304-y ↗
17. Unexpected giant microwave conductivity in a nominally silent BiFeO3 domain wall10.1002/adma.201905132 ↗
18. Conduction at domain walls in oxide multiferroics10.1038/nmat2373 ↗
19. Direct observation of ferroelectric field effect and vacancy-controlled screening at the BiFeO3/LaxSr1− xMnO3 interface10.1038/nmat4058 ↗
20. Giant resistive switching via control of ferroelectric charged domain walls10.1002/adma.201600160 ↗
21. Polarization charge as a reconfigurable quasi-dopant in ferroelectric thin films10.1038/nnano.2015.114 ↗
22. Manipulation of conductive domain walls in confined ferroelectric nanoislands10.1002/adfm.201807276 ↗
23. Controllable conductive readout in self-assembled, topologically confined ferroelectric domain walls10.1038/s41565-018-0204-1 ↗
24. Domain-wall conduction in ferroelectric BiFeO3 controlled by accumulation of charged defects10.1038/nmat4799 ↗
25. Electric modulation of conduction in multiferroic Ca-doped BiFeO3 films10.1038/nmat2432 ↗
26. Domain wall conductivity in La-doped BiFeO310.1103/PhysRevLett.105.197603 ↗
27. Critical ionic transport across an oxygen-vacancy ordering transition10.1038/s41467-022-32826-8 ↗
28. Integrating band engineering and the flexoelectric effect induced by a composition gradient for high photocurrent density in bismuth ferrite films10.1021/acsami.1c13305 ↗
29. Study on Ca segregation toward an epitaxial interface between bismuth ferrite and strontium titanate10.1021/acsami.9b20505 ↗
30. Three-dimensional visualization of oxygen-vacancy migration and redistribution in Ca-substituted BiFeO310.1021/acsnano.3c06675 ↗
31. Critical ionic transport across an oxygen-vacancy ordering transition10.1038/s41467-022-32826-8 ↗
32. Electric-field-induced epitaxial breakdown and emergent magnetoresistance due to strong oxygen reduction in Ca-doped BiFeO3
33. Negatively charged in-plane and out-of-plane domain walls with oxygen-vacancy agglomerations in a Ca-doped bismuth-ferrite thin film10.1021/acsaelm.1c00638 ↗
34. Complementary study of anisotropic ion conduction in (110)-oriented Ca-doped BiFeO3 films using electrochromism and impedance spectroscopy10.1063/5.0054895 ↗
35. Electric-field-induced insulator to Coulomb glass transition via oxygen-vacancy migration in Ca-doped BiFeO310.1103/PhysRevB.94.035123 ↗
36. Photoenhanced electroresistance at dislocation-mediated phase boundary10.1021/acsami.1c25259 ↗
37. Polarization control of electron tunneling into ferroelectric surfaces10.1126/science.1171200 ↗