A5033052429- 2D Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Graphene research and applications
- Iron-based superconductors research
- Magnetic properties of thin films
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Magnetism in coordination complexes
- X-ray Diffraction in Crystallography
- Magnetic Properties of Alloys
- Crystallization and Solubility Studies
- Quantum and electron transport phenomena
- Copper-based nanomaterials and applications
- Heusler alloys: electronic and magnetic properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Corrosion Behavior and Inhibition
- Boron and Carbon Nanomaterials Research
- Organic and Molecular Conductors Research
- Metal-Organic Frameworks: Synthesis and Applications
- Inorganic Chemistry and Materials
- Chalcogenide Semiconductor Thin Films
- Concrete Corrosion and Durability
- Metal complexes synthesis and properties
Uppsala University
2022-2025
University of Tehran
2018
The discovery of van der Waals (vdW) magnets opened a new paradigm for condensed matter physics and spintronic technologies. However, the operations active devices with vdW ferromagnets are limited to cryogenic temperatures, inhibiting their broader practical applications. Here, robust room-temperature operation lateral spin-valve using itinerant ferromagnet Fe5 GeTe2 in heterostructures graphene is demonstrated. properties measured at interface negative spin polarization. Lateral...
Abstract The Fe n GeTe 2 systems are recently discovered two-dimensional van-der-Waals materials, exhibiting magnetism at room temperature. sub-systems belonging to class special because they show site-dependent magnetic behavior. We focus on the critical evaluation of properties and electron correlation effects in ( = 3, 4, 5) (FGT) performing first-principles calculations. Three different ab initio approaches have been used primarily, viz., (i) standard density functional theory (GGA),...
Recent experiments on Fe5GeTe2 suggested the presence of a symmetry breaking its conventional crystal structure. Here, using density functional theory calculations, we elucidate that stabilization (√3 × √3)R30° supercell structure is caused by swapping Fe atoms occurring in monolayer limit. The to vicinity Te facilitated spontaneous occurrence vacancy and low diffusion barrier. Our calculated magnetic exchange parameters show simultaneous ferromagnetic antiferromagnetic among particular type...
The recent synthesis of a new polymorph two-dimensional (2D) germanium monochalcogenides, namely, $\ensuremath{\gamma}$-GeSe with four-atomic-layer-thick hexagonal lattice, has received considerable attention due to its novel properties and potential applications. This exciting advancement paves the path for extensive experimental theoretical investigations on family $\ensuremath{\gamma}$-MX crystals in which $M$ $X$ are elements group IV VI, respectively. In this regard, herein we conduct...
A manganese(II) metal-organic framework based on the hexatopic hexakis(4-carboxyphenyl)benzene, cpb6-: [Mn3(cpb)(dmf)3], was solvothermally prepared showing a Langmuir area of 438 m2 g-1, rapid uptake OF sulfur hexafluoride (SF6) as well electrochemical and magnetic properties, while single crystal diffraction reveals an unusual rod-MOF topology.
We propose a general framework for designing two-dimensional (2D) topological superconductor (TSC) using magnet-superconductor hybrid system. This setup involves monolayer of CrInTe$_3$, which hosts noncoplanar magnetic textures, in proximity to 2D $s$-wave superconducting layer. Serving as an alternative $p$-wave superconductors, this configuration induces phase and is promising platform realizing the Kitaev model, supports Majorana zero-energy modes through emergent symmetry pairing....
Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. Several microscopic mechanisms have been proposed explain these observations, including transport ultrashort spin-polarized hot-electrons (SPHE). However, currently such spin currents are only poorly characterized due measurement requirements for element and time resolution. Here, using time- element-resolved X-ray circular dichroism alongside atomistic spin-dynamics simulations, we...
Van der Waals (vdW) magnets are promising, because of their tunable magnetic properties with doping or alloy composition, where the strength interactions, symmetry, and anisotropy can be tuned according to desired application. However, so far, most vdW magnet-based spintronic devices have been limited cryogenic temperatures anisotropies favoring out-of-plane canted orientation magnetization. Here, we report beyond room-temperature lateral spin-valve strong in-plane magnetization spin...
Abstract The recent growth of two-dimensional (2D) layered crystals MoSi 2 N 4 and WSi has sparked significant interest due to their outstanding properties potential applications. This development paved the way for a new large family 2D materials with general formula MA Z . In this regard, motivated by exciting family, we propose two structural phases ( 1T - 1H -) M Si = Ge, Sn, Pb) monolayers investigate structural, vibrational, mechanical, electronic optical using first-principles methods....
The frustrated spin-chain (FSC) systems exhibit exotic ground states and distinct quantum phase transitions. $S=\frac{1}{2}$ FSC is known to the Kosterlitz-Thouless transition from a commensurate gapless fully dimerized gapped upon ratio of next-nearest-neighbor nearest-neighbor coupling $(\ensuremath{\alpha}=\frac{{J}_{2}}{{J}_{1}})$ being tuned. On other hand, $S=\frac{5}{2}$ system show transitions partially incommensurate floating phases [Chepiga, Affleck, Mila, Phys. Rev. B 105, 174402...
Cu 3 TaS 4 , a ternary chalcogenide, is promising photovoltaic material. The growth of occurs via the formation 2− x S with vacancies. Ta incorporation in at vacancy sites, followed by diffusion to form .
Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. Several microscopic mechanisms have been proposed explain observations, including transport ultrashort spin-polarized hot-electrons (SPHE). Such spin currents find growing interest because recent challenges spintronics however they are only poorly characterized. One key is characterize and behind SPHE induced manipulation magnetization, especially case technologically relevant...
Abstract Achieving beyond room-temperature ferromagnetism in two-dimensional (2D) magnets is immensely desirable for spintronic applications. Fe 5 GeTe 2 an exceptional van der Waals metallic ferromagnet due to its tunable physical properties and relatively higher Curie temperature ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>T</mml:mi> <mml:mi mathvariant="normal">C</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) than other 2D...
Enhancement of Curie temperature ($T_\mathrm{C}$) two-dimensional (2D) magnets is immensely desirable for room spintronic applications. Fe$_{5}$GeTe$_{2}$ an exceptional van der Waals metallic ferromagnet due to its tunable physical properties and relatively higher $T_\mathrm{C}$ than other 2D magnets. Using density functional theory combined with dynamical mean field Monte Carlo simulations, we show that the monolayer can increase well-above by substitutional doping Ni. It found two...
Van der Waals (vdW) magnets are promising owing to their tunable magnetic properties with doping or alloy composition, where the strength of interactions, symmetry, and anisotropy can be tuned according desired application. However, most vdW magnet based spintronic devices so far limited cryogenic temperatures anisotropies favouring out-of-plane canted orientation magnetization. Here, we report room-temperature lateral spin-valve strong in-plane ferromagnet (Co0.15Fe0.85)5GeTe2 (CFGT) in...
The recent advances in the synthesis of 2D magnetic materials have raised hopes for their potential use next‐generation spintronics devices. These candidates, however, still possess relatively low transition temperatures and small anisotropy energies to achieve efficient functionality. Aiming find high‐performance crystals, authors predict (X = S, Se) as a novel family ferromagnets with half‐metallic electronic properties. A single‐channel spin bandgap ≈2 eV makes them suitable...
Fluid transmission pipes made of aluminum are widely used in petrochemical industries. For many applications, they have to be brazed each other. The joints, cases, encountered with corrosive medias. This paper reports a part work investigate the corrosion behavior AA6061 using AA4047 as filler metal and without use flux under different brazing atmospheres. samples air, vacuum, argon, hydrogen interfacial area joints was examined ensure being free any defects. sides test piece were covered an...
The Fe$_{n}$GeTe$_{2}$ systems are newly discovered two-dimensional van-der-Waals materials, exhibiting magnetism at room temperature. sub-systems belonging to class special because they show site-dependent magnetic behavior. We focus on the critical evaluation of properties and electron correlation effects in ($n$= 3, 4, 5) (FGT) performing first-principles calculations. Three different ab-initio approaches have been used, viz., i) standard density functional theory (DFT), ii) incorporating...