A5061065121- ZnO doping and properties
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Transition Metal Oxide Nanomaterials
- Electronic and Structural Properties of Oxides
- Ga2O3 and related materials
- Copper-based nanomaterials and applications
- Iron oxide chemistry and applications
- Magnetic Properties and Synthesis of Ferrites
- Gas Sensing Nanomaterials and Sensors
- Ferroelectric and Piezoelectric Materials
- Heusler alloys: electronic and magnetic properties
- Magnetic Properties and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced MRI Techniques and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Magnetism in coordination complexes
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- GaN-based semiconductor devices and materials
- Catalytic Processes in Materials Science
- Porphyrin and Phthalocyanine Chemistry
- Catalysis and Oxidation Reactions
Central University of South Bihar
2021-2024
University of Lucknow
2024
The University of Tokyo
2009-2022
SRM University
2022
Boston University
2015-2017
Central University of Kashmir
2017
University of Nebraska–Lincoln
2014-2016
Indian Institute of Technology Kanpur
2007-2008
West Virginia University
2007
Thin films of the ferromagnetic metal ${\mathrm{SrRuO}}_{3}$ (SRO) show a varying easy magnetization axis depending on epitaxial strain, and undergo metal-to-insulator transition with decreasing film thickness. We have investigated magnetic properties SRO thin thicknesses fabricated ${\mathrm{SrTiO}}_{3}$(001) substrates by soft x-ray circular dichroism at Ru ${M}_{2,3}$ edge. Results shown that, thickness, changes from to nonmagnetic around 3 monolayer consistent previous magneto-optical...
We have studied the electronic structure and magnetism of Cu-doped ZnO nanowires, which been reported to show ferromagnetism at room temperature [G. Z. Xing ${et}$ ${al}$., Adv. Mater. {\bf 20}, 3521 (2008).], by x-ray photoemission spectroscopy (XPS), absorption (XAS) magnetic circular dichroism (XMCD). From XPS XAS results, we find that Cu atoms are in "Cu$^{3+}$" state with mixture Cu$^{2+}$ bulk region ($\sim$ 100 nm), ions dominant surface 5 i.e., differs from one. field dependences...
BiFeO3 (BFO) shows both ferroelectricity and magnetic ordering at room temperature, but its ferromagnetic component, which is due to spin canting, negligible. Substitution of transition-metal atoms such as Co for Fe known enhance the component in BFO. In order reveal origin magnetization enhancement, we performed soft x-ray absorption spectroscopy (XAS) circular dichroism (XMCD) studies BiFe1−xCoxO3 (x = 0 0.30) (BFCO) thin films grown on LaAlO3(001) substrates. The XAS results indicated...
The relatively low magnetocrystalline anisotropy (MCA) in strongly correlated manganites (La,Sr)MnO_{3} has been a major hurdle for implementing them spintronic applications. Here we report an unusual, giant enhancement of in-plane MCA 6 nm La_{0.67}Sr_{0.33}MnO_{3} (LSMO) films grown on (001) SrTiO_{3} substrates when the top 2 is patterned into periodic stripes 100 or 200 width. Planar Hall effect measurements reveal emergent uniaxial superimposed one original biaxial easy axes unpatterned...
X-ray spectroscopy reveals the presence of inter-band gap electronic states e<sub>g</sub>symmetry in M:BiVO<sub>4</sub>(M = Mo, W) PEC anodes.
Here, we report on the lanthanum (La) doping induced structural changes in chemical solution grown Bi1−xLaxFeO3 (0.0⩽x⩾0.30) thin films indium tin oxide coated glass substrates and influence film’s properties. Films show gradual from rhombohedral towards a pseudocubic structure as La content increases, also evident lattice constant disappearance of peak splitting upon increasing level. This was accompanied by an increase dielectric constant, magnetization marginal decrease leakage current...
To date, scale‐up fabrication of transition metal dichalcogenide (TMD‐) based 2D/2D or 2D/3D heterostructures with specific functionalities is still a great challenge. This study, for the first time, reports on controllable synthesis large‐area and continuous semiconductor/metal consisting monolayer MoS 2 bulk MoO unique electrical optical properties via one‐step, vapor‐transport‐assisted rapid thermal processing. The temperature‐dependent transport measurements reveal that –MoO...
Metallic transition-metal oxides undergo a metal-to-insulator transition (MIT) as the film thickness decreases across critical of several monolayers (MLs), but its driving mechanism remains controversial. We have studied thickness-dependent MIT ferromagnetic metal ${\mathrm{La}}_{0.6}$${\mathrm{Sr}}_{0.4}$${\mathrm{MnO}}_{3}$ by x-ray absorption spectroscopy and magnetic circular dichroism. As was decreased (6--8 ML), gradual decrease signals concomitant increase paramagnetic were observed,...
${\text{NiFe}}_{2}$${\text{O}}_{4}$/${\text{BaTiO}}_{3}$ (NFO/BTO) multilayer heterostructures grown on (001)-${\text{SrTiO}}_{3}$ substrates with alternating ferroelectric BTO and ferrimagnetic NFO layers exhibit magnetoelectric (ME) coupling, which increases the number of and, hence, NFO/BTO interfaces. We have studied local electronic magnetic states Ni Fe ions in multilayers various thicknesses by x-ray absorption spectroscopy circular dichroism. With an increasing layers, both moments...
FeNi film was fabricated on Cu/MgO (001) substrates using thermal evaporation technique of a target to realize the formation an L 1 0 ‐FeNi phase. The magnetic anisotropy systematically investigated by means X‐ray absorption spectroscopy (XAS) and circular dichroism (XMCD) techniques. Our ‐edge XAS XMCD analysis is performed for 30‐nm grown substrate. present experimental results indicate that ~5% Fe atoms are oxidized. findings also showed orbital moment has significant incident angle...
The magnetic states of Mn and Co atoms in Co-rich ${\text{Co}}_{2}\text{MnGe}$ Heusler alloy thin films facing an MgO barrier were studied by means soft x-ray circular dichroism (XMCD). In particular, the film-thickness dependence moments was investigated. With a decrease film thickness to 1--2 monolayers (MLs), spin moment decreased $\text{Mn}\text{ }{L}_{2,3}$-edge absorption spectra (XAS) showed ${\text{Mn}}^{2+}$-like multiplet structure MnO, contrast samples thicker than 4 ML,...
We have studied magnetism in anatase Ti1−xCoxO2−δ (x = 0.05) thin films with various electron carrier densities, by soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L2,3 absorption edges. For electrically conducting samples, moment estimated XMCD was &lt;0.3 μB/Co using surface-sensitive total yield mode, while it 0.3–2.4 bulk-sensitive fluorescence mode. The latter value is same range as saturation magnetization 0.6–2.1 deduced SQUID measurement. and intensity...
The coercivity of La1–xSrxMnO3 thin films can be enhanced by Ru substitution for Mn. In order to elucidate its mechanism, we performed soft x-ray absorption and magnetic circular dichroism measurements at the M2,3 Mn L2,3 edges. We found that spin direction are opposite has a finite orbital moment. Cluster-model analysis indicated moment as well reduced result from local lattice distortion caused epitaxial strain SrTiO3 substrate in presence spin-orbit interaction.