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Nanomaterials, volume 10, issue 10, pages 1990

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

Sobola Dinara 2, 3, 4
Polčak Josef 3, 6
Potoček Michal 3, 6
Kaspar Pavel 2
Dallaev Rashid 2
2
 
Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 2848/8, 61600 Brno, Czech Republic
3
 
Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic
5
 
Institute of the Scientific Instruments of the Czech Academy of Sciences v.v.i., Královopolská 147, 61264 Brno, Czech Republic
6
 
Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic
Publication typeJournal Article
Publication date2020-10-09
Journal: Nanomaterials
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor5.3
ISSN20794991
PubMed ID:  33050330
General Chemical Engineering
General Materials Science
Abstract

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.

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GOST Copy
Ramazanov S. et al. Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG // Nanomaterials. 2020. Vol. 10. No. 10. p. 1990.
GOST all authors (up to 50) Copy
Ramazanov S., Sobola D., Orudzhev F., Knápek A., Polčak J., Potoček M., Kaspar P., Dallaev R. Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG // Nanomaterials. 2020. Vol. 10. No. 10. p. 1990.
RIS |
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RIS Copy
TY - JOUR
DO - 10.3390/nano10101990
UR - https://doi.org/10.3390%2Fnano10101990
TI - Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG
T2 - Nanomaterials
AU - Polčak, Josef
AU - Potoček, Michal
AU - Dallaev, Rashid
AU - Ramazanov, Shikhgasan
AU - Sobola, Dinara
AU - Orudzhev, Farid
AU - Knápek, Alexandr
AU - Kaspar, Pavel
PY - 2020
DA - 2020/10/09 00:00:00
PB - Multidisciplinary Digital Publishing Institute (MDPI)
SP - 1990
IS - 10
VL - 10
PMID - 33050330
SN - 2079-4991
ER -
BibTex |
Cite this
BibTex Copy
@article{2020_Ramazanov
author = {Josef Polčak and Michal Potoček and Rashid Dallaev and Shikhgasan Ramazanov and Dinara Sobola and Farid Orudzhev and Alexandr Knápek and Pavel Kaspar},
title = {Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG},
journal = {Nanomaterials},
year = {2020},
volume = {10},
publisher = {Multidisciplinary Digital Publishing Institute (MDPI)},
month = {oct},
url = {https://doi.org/10.3390%2Fnano10101990},
number = {10},
pages = {1990},
doi = {10.3390/nano10101990}
}
MLA
Cite this
MLA Copy
Ramazanov, Shikhgasan, et al. “Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG.” Nanomaterials, vol. 10, no. 10, Oct. 2020, p. 1990. https://doi.org/10.3390%2Fnano10101990.
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