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Author

M.H. Ehsani

Other affiliations: University of Shahrood
Bio: M.H. Ehsani is an academic researcher from Semnan University. The author has contributed to research in topics: Thin film & Magnetization. The author has an hindex of 17, co-authored 75 publications receiving 820 citations. Previous affiliations of M.H. Ehsani include University of Shahrood.


Papers
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Journal ArticleDOI
TL;DR: In this article, the influence of a glancing angle deposition (GLAD) technique for deposition of SnS layer, on the photovoltaic performance of solar cells was analyzed.

94 citations

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TL;DR: In this paper, a solvothermal route based on high temperature decomposition of metal nitrates in the presence of different contents of Triethylene glycol was used to synthesize manganese spinel ferrite nanoparticles.

69 citations

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TL;DR: In this paper, the structural and magnetic properties of the nano-noparticles are investigated by X-Ray diffraction, Fourier transform infra-red (FT-IR) spectroscopy, transmission electron microscopy (TEM), and DC magnetization measurements.
Abstract: 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.

64 citations

Journal ArticleDOI
TL;DR: In this article, structural, magnetic, and electrical properties of the La0.8−xSmxSr0.2MnO3 manganites prepared by a solid-state reaction technique was studied systematically.

58 citations

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TL;DR: In this article, the authors investigated the influence of grain size on the conduction mechanism of double-layered LaSr2Mn2O7 manganite and found that with an increase in the grain size, resistivity decreased at all temperature ranges.

46 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the electron beam assisted evaporation technique is analyzed along with other methods operating at oblique angles, including, among others, magnetron sputtering and pulsed laser or ion beam-assisted deposition techniques.

537 citations

Journal ArticleDOI
TL;DR: In this paper, a simulation-based study was carried out on all-perovskite tandem (both top and bottom subcells made up of perovskites) multijunction devices.

132 citations

Journal ArticleDOI
TL;DR: In this article, the influence of a glancing angle deposition (GLAD) technique for deposition of SnS layer, on the photovoltaic performance of solar cells was analyzed.

94 citations

Journal ArticleDOI
TL;DR: A critical review of the evolution of the advanced coatings deposition process, mainly focused on the Physical Vapour Deposition (PVD) process, particularly in the Magnetron Sputtering technique, is presented in this paper.

88 citations

Journal ArticleDOI
TL;DR: The structure, critical exponents and magnetocaloric effect (MCE) of the second-order magnetic phase transition were investigated in detail in this article, showing that the sample adopts an orthorhombic structure with Pnma space group.

87 citations