Saber Farjami Shayesteh

University of Guilan

*This is an algorithmically generated author record based on publicly available information.

See Latest Publications

See Most Cited Publications

SciProfiles

ORCID Profile

Google Scholar

Current Organizations / Institutes

The organizations/institutes from the scholar's latest article

University of Guilan

Research Subjects

Research Interests

Saber Farjami Shayesteh has a total of 50 co-authors. Here are the top co-authors by number of shared publications:

Asadollah Bafekry
Department of Physics, University of Guilan, Rasht, Iran
4 shared publications
Salimeh Mahdavifar
University of Guilan
4 shared publications
Abdolvahab Amirsalari
2 shared publications
François Maria Peeters
Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
2 shared publications
H. Moradmard
Nanostructure Laboratory, Department of Physics, University of Guilan, Rasht 4193833697, Iran
2 shared publications
K. Boustani
Payame Noor University
2 shared publications

Latest Publications

Sort by

Website
Google Scholar
Cited by 10
- 22 December 2021
- Published by American Physical Society (APS) in Physical Review B
Charge-spin interconversion in graphene-based systems from density functional theory
by Maedeh Rassekh, Hernán Santos, Andrea Latgé, Leonor Chico, Saber Farjami Shayesteh, Juan Jose Palacios
We present a methodology to address, from first principles, charge-spin interconversion in two-dimensional materials with spin-orbit coupling. Our study relies on an implementation of density functional theory based quantum transport formalism adapted to such purpose. We show how an analysis of the $k$ -resolved spin polarization gives the necessary insight to understand the different charge-spin interconversion mechanisms. We have tested it in the simplest scenario of isolated graphene in a perpendicular electric field where effective tight-binding models are available to compare with. Our results show that the flow of an unpolarized current across a single layer of graphene produces, as expected, a spin separation perpendicular to the current for two of the three spin components (out-of-plane and longitudinal), which is the signature of the spin Hall effect. Additionally, it also yields an overall spin accumulation for the third spin component (perpendicular to the current), which is the signature of the Rashba-Edelstein effect. Even in this simple example, our results reveal an unexpected competition between the Rashba and the intrinsic spin-orbit coupling. Remarkably, the sign of the accumulated spin density does not depend on the electron or hole nature of the injected current for realistic values of the Rashba coupling.
Website
Google Scholar
- 22 December 2021
- Published by American Physical Society (APS) in Physical Review B
Charge-spin interconversion in graphene-based systems from density functional theory
by Maedeh Rassekh, Hernán Santos, Andrea Latgé, Leonor Chico, Saber Farjami Shayesteh, Juan Jose Palacios
We present a methodology to address, from first principles, charge-spin interconversion in two-dimensional materials with spin-orbit coupling. Our study relies on an implementation of density functional theory based quantum transport formalism adapted to such purpose. We show how an analysis of the $k$ -resolved spin polarization gives the necessary insight to understand the different charge-spin interconversion mechanisms. We have tested it in the simplest scenario of isolated graphene in a perpendicular electric field where effective tight-binding models are available to compare with. Our results show that the flow of an unpolarized current across a single layer of graphene produces, as expected, a spin separation perpendicular to the current for two of the three spin components (out-of-plane and longitudinal), which is the signature of the spin Hall effect. Additionally, it also yields an overall spin accumulation for the third spin component (perpendicular to the current), which is the signature of the Rashba-Edelstein effect. Even in this simple example, our results reveal an unexpected competition between the Rashba and the intrinsic spin-orbit coupling. Remarkably, the sign of the accumulated spin density does not depend on the electron or hole nature of the injected current for realistic values of the Rashba coupling.
Cited by 10
Website
Google Scholar
Cited by 142
- 1 February 2020
- Published by Elsevier in Carbon
A first-principles study of the effects of atom impurities, defects, strain, electric field and layer thickness on the electronic and magnetic properties of the C2N nanosheet
by Asadollah Bafekry, Catherine Stampfl, Mitra Ghergherehchi, Saber Farjami Shayesteh
Website
Google Scholar
- 1 February 2020
- Published by Elsevier in Carbon
A first-principles study of the effects of atom impurities, defects, strain, electric field and layer thickness on the electronic and magnetic properties of the C2N nanosheet
by Asadollah Bafekry, Catherine Stampfl, Mitra Ghergherehchi, Saber Farjami Shayesteh
Cited by 142
Website
Google Scholar
Cited by 14
- 1 January 2020
- Published by Pleiades Publishing Ltd in Physics of the Solid State
Effect of Synthesis Conditions on the Structural, Photocatalic, and Self-Cleaning Properties of TiO2 Nanoparticles
by M. Rahmati Ali Abad, S. Farjami Shayesteh, H. Farjami Shayesteh
TiO₂ nanoparticles were synthesized via the hydrothermal method. As-synthesized TiO₂ properties were characterized by XRD, EDX, FESEM, FTIR, and UV-Vis spectroscopy. Indicated peaks in XRD patterns confirm formation of TiO₂ nanoparticles with the anatase phase. Average crystallite sizes and strain were estimated from the XRD main peaks of all samples through Williamson–Hall method. Optical energy band gap of TiO₂ was determined to be about 3.27–3.44 eV, which appeared higher than those of other researches for anatase TiO₂ (3.20 eV). Also, increasing temperatures and aging times make the crystallite size increase and the energy band gap decrease. Photocatalytic activity of samples was examined by measuring rate of methylene blue (MB) decomposition. In photocatalytic process, MB was degraded by photocatalytic and adsorption processes. Aging temperature and time were significant in terms of the MB decolorization ability. The optimal synthesis condition of temperature and aging time was obtained at about 130°C and 16 h, respectively. TiO₂ nanopowder prepared in the previous step was deposited by the spin-coating method on a glass substrate. Self-cleaning properties of the glass substrate coated with TiO₂ nanoparticles were studied by measuring the water contact angle. TiO₂ thin films have little photocatalytic activity because of their low area. To overcome this disadvantage, TiO₂ porous thin films were deposited on glass substrates using polyethylene glycol (PEG) as a template pore-generating agent. TiO₂ thin film with 20 wt % PEG showed better hydrophilic property and a better self-cleaning property. Enhancement of surface wettability due to UV-induced TiO₂ hydrophilicity has been evidenced by contact angle measurements.
Website
Google Scholar
- 1 January 2020
- Published by Pleiades Publishing Ltd in Physics of the Solid State
Effect of Synthesis Conditions on the Structural, Photocatalic, and Self-Cleaning Properties of TiO2 Nanoparticles
by M. Rahmati Ali Abad, S. Farjami Shayesteh, H. Farjami Shayesteh
TiO₂ nanoparticles were synthesized via the hydrothermal method. As-synthesized TiO₂ properties were characterized by XRD, EDX, FESEM, FTIR, and UV-Vis spectroscopy. Indicated peaks in XRD patterns confirm formation of TiO₂ nanoparticles with the anatase phase. Average crystallite sizes and strain were estimated from the XRD main peaks of all samples through Williamson–Hall method. Optical energy band gap of TiO₂ was determined to be about 3.27–3.44 eV, which appeared higher than those of other researches for anatase TiO₂ (3.20 eV). Also, increasing temperatures and aging times make the crystallite size increase and the energy band gap decrease. Photocatalytic activity of samples was examined by measuring rate of methylene blue (MB) decomposition. In photocatalytic process, MB was degraded by photocatalytic and adsorption processes. Aging temperature and time were significant in terms of the MB decolorization ability. The optimal synthesis condition of temperature and aging time was obtained at about 130°C and 16 h, respectively. TiO₂ nanopowder prepared in the previous step was deposited by the spin-coating method on a glass substrate. Self-cleaning properties of the glass substrate coated with TiO₂ nanoparticles were studied by measuring the water contact angle. TiO₂ thin films have little photocatalytic activity because of their low area. To overcome this disadvantage, TiO₂ porous thin films were deposited on glass substrates using polyethylene glycol (PEG) as a template pore-generating agent. TiO₂ thin film with 20 wt % PEG showed better hydrophilic property and a better self-cleaning property. Enhancement of surface wettability due to UV-induced TiO₂ hydrophilicity has been evidenced by contact angle measurements.
Cited by 14
Website
Google Scholar
Cited by 101
- 2 December 2019
- Published by AIP Publishing in Journal of Applied Physics
Two-dimensional carbon nitride (2DCN) nanosheets: Tuning of novel electronic and magnetic properties by hydrogenation, atom substitution and defect engineering
by Asadollah Bafekry, Saber Farjami Shayesteh, Francois M. Peeters
By employing first-principles calculations within the framework of density functional theory, we investigated the structural, electronic, and magnetic properties of graphene and various two-dimensional carbon-nitride (2DNC) nanosheets. The different 2DCN gives rise to diverse electronic properties such as metals ( $C_{3} N_{2}$ ), semimetals ( $C_{4} N$ and $C_{9} N_{4}$ ), half-metals ( $C_{4} N_{3}$ ), ferromagnetic-metals ( $C_{9} N_{7}$ ), semiconductors ( $C_{2} N$ , $C_{3} N$ , $C_{3} N_{4}$ , $C_{6} N_{6}$ , and $C_{6} N_{8}$ ), spin-glass semiconductors ( $C_{10} N_{9}$ and $C_{14} N_{12}$ ), and insulators ( $C_{2} N_{2}$ ). Furthermore, the effects of adsorption and substitution of hydrogen atoms as well as N-vacancy defects on the electronic and magnetic properties are systematically studied. The introduction of point defects, including N vacancies, interstitial H impurity into graphene and different 2DCN crystals, results in very different band structures. Defect engineering leads to the discovery of potentially exotic properties that make 2DCN interesting for future investigations and emerging technological applications with precisely tailored properties. These properties can be useful for applications in various fields such as catalysis, energy storage, nanoelectronic devices, spintronics, optoelectronics, and nanosensors.
Website
Google Scholar
- 2 December 2019
- Published by AIP Publishing in Journal of Applied Physics
Two-dimensional carbon nitride (2DCN) nanosheets: Tuning of novel electronic and magnetic properties by hydrogenation, atom substitution and defect engineering
by Asadollah Bafekry, Saber Farjami Shayesteh, Francois M. Peeters
By employing first-principles calculations within the framework of density functional theory, we investigated the structural, electronic, and magnetic properties of graphene and various two-dimensional carbon-nitride (2DNC) nanosheets. The different 2DCN gives rise to diverse electronic properties such as metals ( $C_{3} N_{2}$ ), semimetals ( $C_{4} N$ and $C_{9} N_{4}$ ), half-metals ( $C_{4} N_{3}$ ), ferromagnetic-metals ( $C_{9} N_{7}$ ), semiconductors ( $C_{2} N$ , $C_{3} N$ , $C_{3} N_{4}$ , $C_{6} N_{6}$ , and $C_{6} N_{8}$ ), spin-glass semiconductors ( $C_{10} N_{9}$ and $C_{14} N_{12}$ ), and insulators ( $C_{2} N_{2}$ ). Furthermore, the effects of adsorption and substitution of hydrogen atoms as well as N-vacancy defects on the electronic and magnetic properties are systematically studied. The introduction of point defects, including N vacancies, interstitial H impurity into graphene and different 2DCN crystals, results in very different band structures. Defect engineering leads to the discovery of potentially exotic properties that make 2DCN interesting for future investigations and emerging technological applications with precisely tailored properties. These properties can be useful for applications in various fields such as catalysis, energy storage, nanoelectronic devices, spintronics, optoelectronics, and nanosensors.
Cited by 101
Website
Google Scholar
Cited by 69
- 10 October 2019
- Published by AIP Publishing in Journal of Applied Physics
Tuning the bandgap and introducing magnetism into monolayer BC3 by strain/defect engineering and adatom/molecule adsorption
by Asadollah Bafekry, Saber Farjami Shayesteh, Mitra Ghergherehchi, Francois M. Peeters
Using first-principles calculations, we study the structural, electronic, and optical properties of pristine BC $_{3}$ . Our results show that BC $_{3}$ is a semiconductor which can be useful in optoelectronic device applications. Furthermore, we found that the electronic properties of BC $_{3}$ can be modified by strain and the type of edge states. With increasing thickness, the indirect bandgap decreases from 0.7 eV (monolayer) to 0.27 eV (bulk). Upon uniaxial tensile strain along the armchair and zigzag directions, the bandgap slightly decreases, and with increasing uniaxial strain, the bandgap decreases, and when reaching $- 8 %$ , a semiconductor-to-metal transition occurs. By contrast, under biaxial strain, the bandgap increases to 1.2 eV in $+ 8 %$ and decreases to zero in $- 8 %$ . BC $_{3}$ nanoribbons with different widths exhibit magnetism at the zigzag edges, while, at the armchair edges, they become semiconductor, and the bandgap is in the range of 1.0–1.2 eV. Moreover, we systematically investigated the effects of adatoms/molecule adsorption and defects on the structural, electronic, and magnetic properties of BC $_{3}$ . The adsorption of various adatoms and molecules as well as topological defects (vacancies and Stone-Wales defects) can modify the electronic properties. Using these methods, one can tune BC $_{3}$ into a metal, half-metal, ferromagnetic-metal, and dilute-magnetic semiconductor or preserve its semiconducting character.
Website
Google Scholar
- 10 October 2019
- Published by AIP Publishing in Journal of Applied Physics
Tuning the bandgap and introducing magnetism into monolayer BC3 by strain/defect engineering and adatom/molecule adsorption
by Asadollah Bafekry, Saber Farjami Shayesteh, Mitra Ghergherehchi, Francois M. Peeters
Using first-principles calculations, we study the structural, electronic, and optical properties of pristine BC $_{3}$ . Our results show that BC $_{3}$ is a semiconductor which can be useful in optoelectronic device applications. Furthermore, we found that the electronic properties of BC $_{3}$ can be modified by strain and the type of edge states. With increasing thickness, the indirect bandgap decreases from 0.7 eV (monolayer) to 0.27 eV (bulk). Upon uniaxial tensile strain along the armchair and zigzag directions, the bandgap slightly decreases, and with increasing uniaxial strain, the bandgap decreases, and when reaching $- 8 %$ , a semiconductor-to-metal transition occurs. By contrast, under biaxial strain, the bandgap increases to 1.2 eV in $+ 8 %$ and decreases to zero in $- 8 %$ . BC $_{3}$ nanoribbons with different widths exhibit magnetism at the zigzag edges, while, at the armchair edges, they become semiconductor, and the bandgap is in the range of 1.0–1.2 eV. Moreover, we systematically investigated the effects of adatoms/molecule adsorption and defects on the structural, electronic, and magnetic properties of BC $_{3}$ . The adsorption of various adatoms and molecules as well as topological defects (vacancies and Stone-Wales defects) can modify the electronic properties. Using these methods, one can tune BC $_{3}$ into a metal, half-metal, ferromagnetic-metal, and dilute-magnetic semiconductor or preserve its semiconducting character.
Cited by 69
Website
Google Scholar
Cited by 68
- 9 September 2019
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
Introducing novel electronic and magnetic properties in C ₃ N nanosheets by defect engineering and atom substitution
by Asadollah Bafekry, Saber Farjami Shayesteh, Francois M. Peeters
Using first-principles calculations the effects of topological defects, vacancies, Stone–Wales and anti-site and substitution of atoms, on the structure and electronic properties of monolayer C ₃ N are investigated.
Website
Google Scholar
- 9 September 2019
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
Introducing novel electronic and magnetic properties in C ₃ N nanosheets by defect engineering and atom substitution
by Asadollah Bafekry, Saber Farjami Shayesteh, Francois M. Peeters
Using first-principles calculations the effects of topological defects, vacancies, Stone–Wales and anti-site and substitution of atoms, on the structure and electronic properties of monolayer C ₃ N are investigated.
Cited by 68
Website
Google Scholar
Cited by 1
- 25 August 2018
- Published by Springer Nature in Journal of Materials Science: Materials in Electronics
The effect of an anionic surfactant on structure and supercapacitive properties of flower-like nickel oxide
by A. Emamdoust, S. Farjami Shayesteh, M. Arvand, M. Sayar
Website
Google Scholar
- 25 August 2018
- Published by Springer Nature in Journal of Materials Science: Materials in Electronics
The effect of an anionic surfactant on structure and supercapacitive properties of flower-like nickel oxide
by A. Emamdoust, S. Farjami Shayesteh, M. Arvand, M. Sayar
Cited by 1
Open Access
Website
Google Scholar
Cited by 26
- 1 January 2018
- Published by Elsevier in Ultrasonics Sonochemistry
Ultrasound induced strain in ultrasmall CoFe2O4@polyvinyl alcohol nanocomposites
by Sh. Mirzaee, S. Farjami Shayesteh
Website
Google Scholar
- 1 January 2018
- Published by Elsevier in Ultrasonics Sonochemistry
Open Access
Ultrasound induced strain in ultrasmall CoFe2O4@polyvinyl alcohol nanocomposites
by Sh. Mirzaee, S. Farjami Shayesteh
Cited by 26
Website
Google Scholar
Cited by 13
- 4 December 2017
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
Cation Distributions and Magnetic Properties of Cu-Doped Nanosized MnFe₂O₄Synthesized by the Coprecipitation Method
by M. Khaleghi, H. Moradmard, S. Farjami Shayesteh
Cu²⁺ substituted manganese ferrite nanoparticles (CuₓMn1-xFe₂O⁴, x = 0, 0.3, 0.5) were prepared using the Coprecipitation method. The effects of Cu²⁺ doped on the structure and the magnetic properties of the products were characterized by X-ray diffraction (XRD), Fourier transform infrared, and vibrating sample magnetometer (VSM), respectively. The scanning electron microscopy and energy dispersive X-ray analysis were carried to the morphological assessment and the percentage of Cu/Mn values. The crystallite size of the samples is in the range of ~ 35-42 nm, and the lattice parameter is decreased from 8.50 to 8.394 °A with Cu²⁺ content. Cation distribution and structural parameters of the synthesized powder were determined by Rietveld analysis of the XRD data. Room temperature VSM measurements show that the products have a ferromagnetic behavior with the saturation magnetization (Ms) values in the range of ~ 42-30 emu/g. The results showed that the decrease of Ms with increasing the copper concentration can be attributed to the influence of the occupancy in the specific sites and the difference in the magnetic moment of Cu²⁺ and Fe³⁺.
Website
Google Scholar
- 4 December 2017
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
Cation Distributions and Magnetic Properties of Cu-Doped Nanosized MnFe₂O₄Synthesized by the Coprecipitation Method
by M. Khaleghi, H. Moradmard, S. Farjami Shayesteh
Cu²⁺ substituted manganese ferrite nanoparticles (CuₓMn1-xFe₂O⁴, x = 0, 0.3, 0.5) were prepared using the Coprecipitation method. The effects of Cu²⁺ doped on the structure and the magnetic properties of the products were characterized by X-ray diffraction (XRD), Fourier transform infrared, and vibrating sample magnetometer (VSM), respectively. The scanning electron microscopy and energy dispersive X-ray analysis were carried to the morphological assessment and the percentage of Cu/Mn values. The crystallite size of the samples is in the range of ~ 35-42 nm, and the lattice parameter is decreased from 8.50 to 8.394 °A with Cu²⁺ content. Cation distribution and structural parameters of the synthesized powder were determined by Rietveld analysis of the XRD data. Room temperature VSM measurements show that the products have a ferromagnetic behavior with the saturation magnetization (Ms) values in the range of ~ 42-30 emu/g. The results showed that the decrease of Ms with increasing the copper concentration can be attributed to the influence of the occupancy in the specific sites and the difference in the magnetic moment of Cu²⁺ and Fe³⁺.
Cited by 13
Website
Google Scholar
Cited by 8
- 1 December 2017
- Published by Elsevier in Journal of Luminescence
A fundamental study on the effects of nano-silver incorporation on the structure and luminescence properties of color centers in γ′-alumina nanoparticles
by Abdolvahab Amirsalari, Ali Abdolahzadeh Ziabari, Reza Taheri Ghahrizjani, Saber Farjami Shayesteh
Website
Google Scholar
- 1 December 2017
- Published by Elsevier in Journal of Luminescence
A fundamental study on the effects of nano-silver incorporation on the structure and luminescence properties of color centers in γ′-alumina nanoparticles
by Abdolvahab Amirsalari, Ali Abdolahzadeh Ziabari, Reza Taheri Ghahrizjani, Saber Farjami Shayesteh
Cited by 8

Show all