Ferromagnetic-like behaviour in bismuth ferrite films prepared by electrodeposition and subsequent heat treatment

Bilican, Doğa; Menéndez, Enric; Zhang, Jin; Solsona, P.; Fornell, Jordina; Pellicer, Eva; Sort, Jordi

doi:10.1039/c7ra04375a

Cited by 13 publications

(8 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen in Figure 6 a, the M–H hysteresis loop of the unannealed BFO/HOPG sample practically does not change at room and low magnetization removal temperatures. A soft ferromagnet-like behavior is observed, probably related to the obtained nanoscale structure, which contributes to the appearance of small spin twisting in the structure of the AFM phase film [ 75 ]. It is also partially associated with defective inclusions in HOPG formed at the stage of obtaining the ALD layer (Fe–C bond) [ 76 ].…”

Section: Resultsmentioning

confidence: 99%

Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG

et al. 2020

View full text Add to dashboard Cite

BiFeO3 (BFO) films on highly oriented pyrolytic graphite (HOPG) substrate were obtained by the atomic layer deposition (ALD) method. The oxidation of HOPG leads to the formation of bubble regions creating defective regions with active centers. Chemisorption occurs at these active sites in ALD. Additionally, carbon interacts with ozone and releases carbon oxides (CO, CO2). Further annealing during the in situ XPS process up to a temperature of 923 K showed a redox reaction and the formation of oxygen vacancies (Vo) in the BFO crystal lattice. Bubble delamination creates flakes of BiFeO3-x/rGO heterostructures. Magnetic measurements (M–H) showed ferromagnetism (FM) at room temperature Ms ~ 120 emu/cm3. The contribution to magnetization is influenced by the factor of charge redistribution on Vo causing the distortion of the lattice as well as by the superstructure formed at the boundary of two phases, which causes strong hybridization due to the superexchange interaction of the BFO film with the FM sublattice of the interface region. The development of a method for obtaining multiferroic structures with high FM values (at room temperature) is promising for magnetically controlled applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG

et al. 2020

View full text Add to dashboard Cite

show abstract

“…It possesses a curie and Néel temperature at around 770 °C and 370 °C, respectively. BiFeO 3 (BFO) forms a rhombohedral (R3c) structure in its crystallised state [ 8 ]. Owing to these properties BFO has found wide applications in water splitting [ 9 , 10 ], storage memory devices [ 11 ], water remediation [ 12 , 13 ] and solar cells [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Jamshaid et al [ 18 ] used a solvothermal method to prepare a bentonite-Co-doped BFO for the photocatalytic degradation of methyl orange in water. Several methods such as pulsed laser [ 19 ], molecular beam epitaxy [ 20 ], sputtering [ 21 ], co-precipitation [ 22 ] and chemical bath [ 8 , 23 ] deposition techniques have been employed to grow BiFeO 3 powder/films.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photoelectrocatalytic Degradation of Methylene Blue on Electrodeposited Bismuth Ferrite Perovskite Films

et al. 2023

View full text Add to dashboard Cite

Electrodeposited bismuth ferrite (BiFeO3) thin films on fluorine-doped tin oxide (FTO) substrate were employed as photoanodes in the photoelectrocatalytic degradation of methylene blue. The BiFeO3 thin films electrodeposited for 300 s, 600 s, 1200 s, 1800 s and 3600 s were characterised with XRD, field emission scanning electron microscopy (FESEM) and UV–vis diffuse reflectance spectroscopy. SEM images displayed different morphology at different electrodeposition times which affects the photoelectrocatalytic (PEC) performances. The FESEM cross-sectional area was used to measure the thickness of the film. The optical properties showed that the band gaps of the photoanodes were increasing as the electrodeposition time increased. The photocurrent response obtained showed that all thin film photoanodes responded to visible light and lower charge transfer resistance (from electrochemical impedance spectroscopy studies) was observed with photoanodes electrodeposited at a shorter time compared to those at a longer time. The PEC application of the photoanode for the removal of methylene blue (MB) dye in water showed that the percentage degradation decreased with an increase in electrodeposition time with removal rates of 97.6% and 70% observed in 300 s and 3600 s electrodeposition time, respectively. The extent of mineralisation was measured by total organic carbon and reusability studies were carried out. Control experiments such as adsorption, photolysis, photocatalysis and electrocatalysis processes were also investigated in comparison with PEC. The electrodeposition approach with citric acid exhibited improved electrode stability while mitigating the problem of catalyst leaching or peeling off during the PEC process.

show abstract

“…Preparation of BiFeO 3 by means of solid state reaction method is mostly reported to lead to the presence of other thermodynamically stable impurity phases such as Bi 25 FeO 40 , Bi 2 Fe 4 O 9 which is understood to be mainly due to the volatility of Bi 20 , 21 . Bulk BiFeO 3 is antiferromagnetically ordered and has been reported to display little or very less value of magneo electric coupling effects 22 – 27 , while thin film of BiFeO 3 coated on some suitable substrates are reported to exhibit weak ferromagnetic properties 23 , 28 – 32 . A large number of work carried out on the nanoparticles of BiFeO 3 are shown to exhibit weak ferromagnetic properties 33 – 39 , but with these particles exhibiting only partial or totally lacking of ferroelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Atomic scale insights on the growth of BiFeO3 nanoparticles

Parvathy

Govindaraj

2022

Sci Rep

View full text Add to dashboard Cite

This study provides new insights on the formation of the nanocrystallites of phase pure BiFeO3 prepared using sol–gel method with tartaric acid as the fuel as comprehended based on the local structure and magnetic hyperfine fields at Fe sites using Mossbauer spectroscopy. Important steps involved in the growth of the nanocrystallites of BiFeO3 in the sol–gel reaction are elucidated in a detailed manner in this study for the first time. Three important stages with the second stage marked by the formation of as high as 75% of nanocrystallites of BiFeO3 occurring over a narrow calcination temperature interval 700–723 K have been deduced in this study. Variation of hyperfine parameters with calcination temperature of the dried precursor gel leading to an increase in the mean size of crystallites of BiFeO3 has been deduced. The nanoparticles of BiFeO3 are deduced to exhibit weak ferromagnetic property in addition to being strongly ferroelectric based on the magnetization and P-E loop studies. Consequently an appreciable magneto electric coupling effect in terms of significant changes in P-E loop variation with the application of external magnetic field is elucidated in this study, which is comprehended based on the defects associated with BiFeO3 nanoparticles.

show abstract

Ferromagnetic-like behaviour in bismuth ferrite films prepared by electrodeposition and subsequent heat treatment

Abstract: BiFeO3 films are achieved by electrodeposition followed by heat-treatment in air. The films show ferromagnetic-like behaviour at room temperature.

Cited by 13 publications

References 52 publications

Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG

Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG

Photoelectrocatalytic Degradation of Methylene Blue on Electrodeposited Bismuth Ferrite Perovskite Films

Atomic scale insights on the growth of BiFeO3 nanoparticles

Contact Info

Product

Resources

About