Pohang University of Science and Technology · 材料科学
Professor Jitendra Pal Singh's research lab specializes in the synthesis, characterization, and irradiation-induced modification of magnetic and multiferroic nanomaterials, with a focus on ferrites such as zinc ferrite, nickel ferrite, cobalt ferrite, and magnesium oxide. The lab investigates size-dependent structural, optical, electrical, and magnetic properties, particularly through ion beam irradiation and advanced spectroscopic techniques. Key research directions include phonon confinement effects, cation inversion in spinel ferrites, and the engineering of multiferroic behavior via rare-earth doping. The lab also explores ion irradiation effects on thin films, analyzing changes in electronic structure and surface morphology at the nanoscale.
Figures are computed from collected data and may differ slightly.
Abstract Zinc ferrite nanoparticles of different sizes ranging from 12 to 62 nm were synthesized by using the nitrate route. These nanoparticles were irradiated by a 100 MeV oxygen beam at two fluences: 1 × 10 13 and 5 × 10 13 ions/cm 2 . It was observed that modes corresponding to cubic spinel phase were retained after the irradiation in all the systems. The variation in the parameters of various modes follows phonon confinement, while this effect seems to violate in irradiated specimen. It was
Bulk zinc ferrite has been studied in the past. In the bulk form zinc ferrite crystallizes in the normal spinel structure with all the zinc ions occupying the tetrahedral and all the iron occupying the octahedral sites, respectively. But, nanosize zinc ferrite is believed to crystallize in a different way. It is now well established that in a nanosize zinc ferrite there is partial inversion in the cation occupancy, leading to some kind of magnetic ordering in this system much above its Neel temp
This paper reports the study of structural, electrical, magnetic and optical properties of Gd-doped nickel ferrite nanoparticles in order to investigate the possibility of multiferroism. The NiGd 0.04 Fe 1.96 O 4 nanoparticles were prepared by a chemical route and characterized by various techniques. Doping with Gd ions induces poor ferroelectricity in nickel ferrite. This may be attributed to the small distortion in the centrosymmetric fcc structure because of the presence of large Gd ions.
Present work reports 200 MeV Ag 15+ irradiation induced effects on the surface morphology, grain size and local electronic structure in MgO thin films deposited by e-beam evaporation under ultra High vacuum. The grain size was found to decrease from 37 nm (pristine film) to 23 nm for the sample irradiated with fluence of 1×10 12 ions/cm 2 and thereafter it increases upto fluence of 5×10 12 ions/cm 2 . Similar changes with ion fluence were also observed for surface roughness. Shifting and disappe
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Jitendra Pal Singh, R. C. Srivastava, H. M. Agrawal; Optical Behaviour of Zinc Ferrite Nanoparticles. AIP Conference Proceedings 4 October 2010; 1276 (1): 137–143. https://doi.org/10.1063/1.3504278 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley
In this chapter, we present an overview of synthesis of MgO nanoparticles and thin films by using top-down and bottom-up approaches. The bottom-up approaches are generally utilized to grow nanoparticles by the methods that involve chemical reactions. Sometimes, methods based on these reactions are also able to grow thin films. The top-down approaches are preferred for growing thin films where bulk material is used for depositions. The methods, which are frequently used, are radio frequency sputt
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