A5054227606- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Shape Memory Alloy Transformations
- ZnO doping and properties
- Magnetic Properties and Synthesis of Ferrites
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Ferroelectric and Piezoelectric Materials
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Electromagnetic wave absorption materials
- Magnetic properties of thin films
- Gas Sensing Nanomaterials and Sensors
- Magnetic Properties and Applications
- Thermal Expansion and Ionic Conductivity
- Advanced Thermoelectric Materials and Devices
- Luminescence Properties of Advanced Materials
- Metallic Glasses and Amorphous Alloys
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Perovskite Materials and Applications
- High-pressure geophysics and materials
- Physics of Superconductivity and Magnetism
- Iron oxide chemistry and applications
VNU University of Science
2023-2024
Vietnam National University, Hanoi
2023-2024
University of Engineering and Technology Lahore
2023
Hankuk University of Foreign Studies
2015-2023
University of Bristol
2006-2017
Chungbuk National University
2004-2016
Vietnam Academy of Science and Technology
2010-2012
University of South Florida
2012
University of Oxford
2010
Hanyang University
2010
A systematic study of the conventional and inverse magnetocaloric effects critical behaviors in Ni50Mn50−xSnx (x = 13 14) alloy ribbons has been performed. We show that although magnetic entropy change around second-order ferromagnetic-paramagnetic (FM-PM) transition (ΔSm ≈ −4 J/kg K) austenitic phase is about five times smaller than first-order martensitic-austenitic (M-A) transformation 22 K), refrigerant capacity (RC) – an important figure merit two larger for former case (RC 160 J/kg)...
Polycrystalline BaTi1−xFexO3 ceramics have been prepared by conventional solid-state reaction. Their structural, optical and magnetic properties are then studied means of x-ray diffraction (XRD), Raman scattering (RS) absorption spectrometers, a physical measurement system. Detailed analyses XRD patterns RS spectra reveal the phase separation tetragonal-hexagonal structure at threshold concentration x = 0.005. The increase in Fe-doping content (x) leads to development hexagonal phase....
Though ZnO is known as a diamagnetic material, recent studies have revealed that its nanostructures can be ferromagnetic (FM). The FM origin has been ascribed to intrinsic defects. This work shines light on an alternate method based mechanical milling induce defect-related ferromagnetism in nanoparticles (NPs) from initial powders. Our idea motivated by the fact introduces more defects ground material. We point out order increases with increasing density of NPs. experimental results obtained...
Polycrystalline samples of BaTiO3 doped with 2.0 at. % Mn were prepared by solid-state reaction at various temperatures (Tan) ranging from 500 to 1350 °C, used high-pure powders BaCO3, TiO2, and MnCO3 as precursors. Experimental results obtained x-ray diffraction patterns Raman scattering spectra reveal that tetragonal Mn-doped starts constituting Tan ≈ °C. The increase leads the development this phase. Interestingly, there is tetragonal-hexagonal transformation in crystal structure 1100...
Among the recently discovered 2D intrinsic van der Waals (vdW) magnets, Fe3 GeTe2 (FGT) has emerged as a strong candidate for spintronics applications, due to its high Curie temperature (130 - 220 K) and magnetic tunability in response external stimuli (electrical field, light, strain). Theory predicts that magnetism of FGT can be significantly modulated by an strain. However, experimental evidence is needed validate this prediction understand underlying mechanism strain-mediated vdW system....
Our work studies the influences of Mn doping on structural characterization and optical magnetic properties BaTi1−xMnxO3 (x = 0.0–0.12) prepared by conventional solid-state reaction. Detailed analyses XRD patterns Raman scattering spectra indicate an incorporation dopants into Ti sites BaTiO3 host lattices, tetragonal-hexagonal transformation taking place at a threshold concentration xc ≈ 0.01. An increase Mn-doping content in BaTi1-xMnxO3 introduces more electronic levels associated with...
We prepared a polycrystalline sample of orthorhombic La0.7Ca0.2Sr0.1MnO3 and then investigated its magnetic properties. Detailed studies analyses in the vicinity ferromagnetic (FM)-paramagnetic phase-transition temperature prove undergoing second-order phase transition, where variations saturation magnetization initial susceptibility versus obey asymptotic relations. Basing on modified Arrott plot, we have determined critical parameters (TC, β, γ, δ) two characteristic regions low-...
The Maxwell relation, the Clausius–Clapeyron equation, and a non–iterative method to obtain critical exponents have been used characterize magnetocaloric effect (MCE) nature of phase transitions in Pr0.5Sr0.5MnO3, which undergoes second-order paramagnetic ferromagnetic (PM-FM) transition at , first-order antiferromagnetic (FM-AFM) . We find that around PM-FM transition, MCE (as represented by magnetic entropy change, ΔSM) can be precisely determined from magnetization measurements using...
In the present work, influence of annealing on structure, electron spin resonance (ESR), and Raman scattering (RS) spectra x at. % Mn-doped ZnO (x=4 8) ceramic compounds has been systematically investigated. The samples were annealed at temperatures (Tan) between 400 1000°C for 12h. obtained results revealed strong dependence x-ray diffraction, ESR, RS temperature Tan. Mn2+ ions did not substitute into Zn2+ sites in range 400–600°C but started to Tan>600°C. this investigation provide...
We have systematically investigated the compositional dependence of magnetic and magnetocaloric properties La0.7-xPrxSr0.3MnO3 (LPSMO). Polycrystalline samples LPSMO with 0.02 ≤ x 0.30 were prepared by a standard solid-state reaction method phase purity structure confirmed using x-ray diffraction. Temperature dependent magnetization measurements Arrott analysis reveal second order ferromagnetic transitions in each sample Curie temperature decreasing progressively increasing Pr content from...
We report a systematic study of the magnetic and magnetocaloric properties La0.7Ca0.3Mn1-xFexO3, where trivalent Fe is substituted for Mn on perovskite B-site in doping range 0.00≤x≤0.07. The polycrystalline materials were prepared by standard solid state reaction method X-ray diffraction confirmed that was incorporated without significant structural changes. Magnetic measurements indicate ferromagnetic double exchange interaction weakened with increasing concentration, resulting shift TC...
Cobalt doped magnetite nanoparticles (Co x Fe3-x O4 NPs) are investigated extensively because of their potential hyperthermia application. However, the complex interrelation among chemical compositions and particle size means correlation with magnetic heating properties is not trivial to predict. Here, we prepared Co NPs (0 ≤ 1) investigate effects cobalt content on properties. A detailed analysis structural features indicated similarity between crystallite sizes as well non-monotonic change...
Abstract Controlling material structure and its electromagnetic properties, including complex permittivity permeability, could enhance the microwave absorption performance of in terms reflection loss effective bandwidth. In this study, La‐substituted barium hexaferrite, Ba 3− x La Co 2 Fe 24 O 41 ( = 0, 0.1, 0.3, 0.5) compounds were successfully prepared using solid‐state reaction method, their corresponding microstructures, static magnetic features 2–18 GHz investigated. The doping content...
We have used the coprecipitation and mechanical-milling methods to fabricate CoFe
We prepared successfully Zn1–xMnxO nanorods (x = 0, 0.008, 0.013, and 0.020) by using chemical vapor deposition. Their crystal structural optical magnetic properties at room temperature were then investigated in detail. Experimental results have revealed that all the samples a single phase with wurtzite structure, lattice parameters slightly increase increasing Mn-doping content. This is ascribed to an incorporation of Mn2+ into Zn site ZnO host lattice. The Mn also creates more defects...