Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Device simulation of 17.3% efficient lead-free all-perovskite tandem solar cell

Simulation of high efficiency SnS-based solar cells with SCAPS

On the Physical Vapour Deposition (PVD): Evolution of Magnetron Sputtering Processes for Industrial Applications

3D-Ising ferromagnetic characteristics and magnetocaloric study in Pr0.4Eu0.2Sr0.4MnO3 manganite

Solvothermal synthesis of MnFe2O4 nanoparticles: The role of polymer coating on morphology and magnetic properties

Nanoparticles of La0.6Sr0.4MnO3 with different particle sizes are synthesized by the nitrate-complex auto-ignition method. The structural and magnetic properties of the samples are investigated by X-Ray diffraction (XRD), Fourier transform infra-red (FT-IR) spectroscopy, transmission electron microscopy (TEM), and DC magnetization measurements. The XRD study coupled with the Rietveld refinement shows that all samples crystallize in a rhombohedral structure with the space group of R-3 C. The FT-IR spectroscopy and TEM images indicate formation of the perovskite structure with the average sizes of 20, 40, and 100 nm for the samples sintered at 700, 800, and 1100 °C, respectively. The DC magnetization measurements confirm tuning of the magnetic properties due to the particle size effects, e.g., reduction in the ferromagnetic moment and increase in the surface spin disorder by decreasing the particle size. The magnetocaloric effect (MCE) study based on isothermal magnetization vs. filed measurements in all samples reveals a relatively large MCE around the Curie temperature of the samples. The peak around the Curie temperature gradually broadens with reduction of the particle size. The data obtained show that although variations in the magnetic entropy and adiabatic temperature decrease by lowering the particle size, variation in the relative cooling power values are the same for all samples. These results make this material a proper candidate in the magnetic refrigerator application above room temperature at moderate fields.

M.H. Ehsani

Papers

Simulation of high efficiency SnS-based solar cells with SCAPS

Solvothermal synthesis of MnFe2O4 nanoparticles: The role of polymer coating on morphology and magnetic properties

Tunable magnetic and magnetocaloric properties of La0.6Sr0.4MnO3 nanoparticles

Influence of Sm-doping on the structural, magnetic, and electrical properties of La0.8−xSmxSr0.2MnO3 (0 < x < 0.45) manganites

Influence of grain size on the electrical properties of the double-layered LaSr2Mn2O7 manganite