A5016356643- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Synthesis of Ferrites
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Ferroelectric and Piezoelectric Materials
- Heusler alloys: electronic and magnetic properties
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Magneto-Optical Properties and Applications
- Dielectric properties of ceramics
- Physics of Superconductivity and Magnetism
- Electromagnetic wave absorption materials
- Characterization and Applications of Magnetic Nanoparticles
- Iron oxide chemistry and applications
- Rare-earth and actinide compounds
- MXene and MAX Phase Materials
- ZnO doping and properties
- Quantum and electron transport phenomena
- Metallic Glasses and Amorphous Alloys
- Dielectric materials and actuators
- Magnetic Field Sensors Techniques
- Electronic and Structural Properties of Oxides
- Model-Driven Software Engineering Techniques
- Shape Memory Alloy Transformations
University of Hyderabad
2015-2024
Indian Institute of Science Bangalore
2014
University of South Florida
2005-2009
National Chemical Laboratory
2007-2009
Indian Institute of Technology Madras
1997-2008
Argonne National Laboratory
2004
Abstract Magnetic nanoparticles embedded in polymer matrices are good examples of functional nanostructures with excellent potential for applications such as electromagnetic interference shielding, magneto‐optical storage, biomedical sensing, flexible electronics, etc. Control over the dispersion nanoparticle phase a matrix is critical and often challenging. To achieve dispersion, competition between polymer–polymer polymer–particle interactions have to be balanced avoid clustering particles...
Mesoporous In2O3 nanocubes were achieved in this present work following a transformation from hierarchical structures of mesoporous In(OH)3 synthesized hydrothermally. Appreciable control on the morphology nanostructures was attained by optimizing reactant concentration, ratio structure directing agent reaction medium (water/PEG ratio), temperature, and time. The samples characterized extensively XRD, TG-DTA, micro-Raman, UV-DRS. Surface area pore size distribution determined N2 adsorption...
Detailed Rietveld analysis of the room temperature (RT) x-ray diffraction data LaxBi1−xFeO3 (LBFO) ceramics (0 ≤ x 0.4) prepared by sol-gel route revealed that system retains distorted rhombohedral R3c structure parent compound BiFeO3 (BFO) for 0.2 but transforms to orthorhombic Pbnm > 0.2. The fundamental 12 Raman modes pure BFO (x = 0.0) are reduced 10 and further 7 0.4, which is a clear indication structural modification symmetry changes brought about La doping. coercive field, HC,...
In this study, we introduce a single/few-layered graphene oxide (GO) synthesized with ultrasonication, and demonstrate its high dielectric permittivity in the frequency range of 20 Hz to 2 MHz temperature 30 °C 180 °C.
Structure and magnetic properties of trivalent Ho substituted BiFeO3 (HoxBi1−xFeO3) have been studied for the compositional range x = 0 to 0.2. The structure remains in rhombohedral R3c < 0.15, further increase results a structural transition orthorhombic Pnma. decrease Raman modes appearance new mode at 475 cm−1 confirms changes. doping Bi site breaks spin cycloid BiFO3 leads observation ferromagnetic order low temperatures. With temperature, M-H curves exhibit pinching leading...
The field dependence of the magnetic entropy change peak at low temperature surface spin freezing transition in chemically synthesized, monodispersed Co, Co–Ag, and Ni–Ag core-shell nanoparticles is studied, with aim gaining insight into critical exponents this transition. It evidenced that although magnitude position can be tuned by changing composition nature (metallic or organic) shell surfactant layers, characteristics are not altered. refrigerant capacity also confirms finding.
Nickel nanoparticles have been synthesized by a simple wet chemical reduction technique in the presence of surfactant sodium dodecyl sulfate (SDS) and capping agent oleic acid. Varying concentration has found to critically govern nature prepared. It is observed that at an optimum SDS acid, nearly monodisperse Ni are obtained form highly ordered hexagonally close-packed structures on electron microscopy grids drop coating procedure. also shown acid necessary for stability synthesized....
We report exchange bias (EB) effect in the Au-Fe3O4 composite nanoparticle system, where one or more Fe3O4 nanoparticles are attached to an Au seed particle forming dimer and cluster morphologies, with clusters showing much stronger EB comparison dimers. The develops due presence of stress interface which leads generation highly disordered, anisotropic surface spins particle. is lost removal interfacial stress. Our atomistic Monte-Carlo studies excellent agreement experimental results. These...
The present investigation details our interesting findings and insights into the evolution of exotic hierarchical superstructures In(OH)3 under solvothermal conditions. Controlled variation reaction parameters such as, reactant concentration, solvent system, crystal structure modifiers, water content along with temperature time, yielded remarkable architectures. Diverse morphologies achieved for first time includes (i) raspberry-like hollow spheres, (ii) nanosheet-assembled (iii)...
We report a reversible, large magnetocaloric effect in the vicinity of low-temperature magnetic transition Co and CocoreAgshell nanoparticles synthesized using wet chemical method. The as-synthesized assembly particles shows sharp peak zero-field-cooled (ZFC) magnetization well below blocking temperature, this feature is associated with surface spin disorder. show increase entropy at around 15 K value nearly 2.25 J/K·kg for an applied field 30 kOe. A similar trend also observed silver-coated...
A single-component polar organic ferroelectric crystal produces THz and second-harmonic radiation.
Ferromagnetic resonance (FMR) technique has been used to study the magnetization relaxation processes and magnetic anisotropy in two different series of Co2FeSi (CFS) Heusler alloy thin films, deposited on Si (1 1 1) substrate by ultra high vacuum magnetron sputtering. While CFS films fixed (50 nm) thickness, at temperatures (TS) ranging from room temperature (RT) 600°C, constitute series-I, with thickness t varying 12 nm 100 550°C make up series-II. In TS = RT 200°C are completely...
Complex ac susceptibility measurements are reported on composite Au–Fe3O4 nanoparticles of two different configurations—the so-called “dumbbell” and “flower” configurations. The frequency-dependent blocking temperature was fitted to separate models in an attempt understand the relaxation role interactions present nanoparticle arrays. While Néel–Arrhenius model failed accurately describe behavior both types particles, Vogel–Fulcher shown fit dumbbell particles indicating importance weak...
The Y3Fe5O12 (YIG) nanopowders were synthesised at different pH using co-precipitation method. effect of on the phase formation YIG is characterised XRD, TEM, FTIR and TG/DTA. From Scherer formula, particle sizes powders found to be 13, 19 28 nm for = 10, 11 12 respectively. It that as solution increase size also increases. clear from TG/DTA curves increasing weight losses small. sintered 600, 700, 800 900°C 5 h conventional sintering completed 800°C/5 which correlated with average grain...