A5037225671- Advanced Condensed Matter Physics
- Nuclear materials and radiation effects
- Magneto-Optical Properties and Applications
- Magnetic properties of thin films
- Geological and Geochemical Analysis
- Magnetic Properties and Applications
- Topological Materials and Phenomena
- Metallic Glasses and Amorphous Alloys
- Multiferroics and related materials
- Plasmonic and Surface Plasmon Research
- Phase-change materials and chalcogenides
- Semiconductor Quantum Structures and Devices
- Seismology and Earthquake Studies
- Optical Coatings and Gratings
- Greenhouse Technology and Climate Control
- Magnetic and transport properties of perovskites and related materials
- Irrigation Practices and Water Management
- Humic Substances and Bio-Organic Studies
- Electromagnetic Effects on Materials
- Photonic and Optical Devices
- Energy, Environment, Agriculture Analysis
- Optical Polarization and Ellipsometry
- Random lasers and scattering media
- Light effects on plants
- Electrowetting and Microfluidic Technologies
Wageningen University & Research
2023-2024
Indian Institute of Science Education and Research Pune
2018-2023
Radboud University Nijmegen
2020-2023
Abstract Greenhouse horticulture grows increasingly important due to its ability provide a controlled microclimate which is optimizable for highly efficient crop growth and resource use, although it may come at significant energy investment cost. One of the most crucial inputs in any greenhouse sunlight, giving free light growth. However, enormously variable, both geographically seasonally. This review discusses materials technologies usable cover screen can passively manipulate incident...
The spatial and temporal dynamics of laser-induced single-shot magnetization switching are studied for various compositions Tb/Co multilayers to understand the underlying mechanism. This is shown be drastically different from ones in Tb-Co alloys as well previously toggle-switching Gd-containing ferrimagnets.
Magnetic memory combining plasmonics and magnetism is poised to dramatically increase the bit density energy efficiency of light-assisted ultrafast magnetic storage, thanks nanoplasmon-driven enhancement confinement light. Here we devise a new path for that, simultaneously enabling light-driven downscaling, reduction required writing, subtle control over degree demagnetization in magnetophotonic surface crystal. It features regular array truncated-nanocone-shaped Au-TbCo antennas showing...
The pyrochlore ${\mathrm{Eu}}_{2}{\mathrm{Ir}}_{2}{\mathrm{O}}_{7}$ has recently attracted significant attention as a candidate Weyl semimetal. previous reports on this compound unanimously show thermally induced metal-to-insulator (MI) transition, concomitant with antiferromagnetic long-range ordering of the Ir moments below ${T}_{\mathit{N}}\ensuremath{\sim}120$ K. However, there are contradictory concerning slope $d\ensuremath{\rho}/dT$ resistivity plots ($\ensuremath{\rho}$) in...
We study the pyrochlore series (Eu$_{1-x}$Bi$_x$)$_2$Ir$_2$O$_7$ for $ 0 \leq x 1$. show that small $x$, lattice undergoes an anomalous contraction but all-in/all-out and metal-to-insulator transitions remain robust, resistivity approaches a $1/T$ dependence at low-T, suggesting proximity to Weyl semimetallic phase, as previously predicted theoretically. At boundary between Eu$_2$Ir$_2$O$_7$ Bi$_2$Ir$_2$O$_7$ qualitatively different ground state emerges, which is characterized by its unusual...
Bottom-up produced optical ring-shaped Ag nanoantennas efficiently funnel electromagnetic field of a femtosecond-pulsed laser light into ferrimagnetic TbCo nanofilm at plasmon resonance. This leads to the demagnetization nanoscale.
We report temperature-dependent Raman scattering and X-ray diffraction studies of pyrochlore iridates, (Eu$_{1-x}$Bi$_x$)$_2$Ir$_2$O$_7$, for x=0, 0.02, 0.035, 0.05 0.1. The temperature variation in experiments spans from 4 K to 300 K, covering the metal-insulator phase transition accompanied by paramagnetic all-in/all-out (AIAO) spin ordering (T$_N$). These systems also show a Weyl semi-metal (WSM) at low temperatures (below ~50 K). that Ir-O-Ir bond bending mode, A$_{1g}$ (510 cm$^{-1}$),...
Amorphous ${\mathrm{Tb}}_{x}{\mathrm{Co}}_{100\ensuremath{-}x}$ magnetic alloys exhibit a list of intriguing properties, such as perpendicular anisotropy, high magneto-optical activity, and magnetization switching using ultrashort optical pulses. Varying the Tb:Co ratio in these allows for tuning properties saturation moment, coercive field, performance light-induced switching. In this paper, we investigate magnetic, optical, various thin-film alloy compositions. We report on effect choice...
The pyrochlore iridates (Eu1-xBix)2Ir2O7(0⩽x⩽1) undergo an anomalous negative lattice expansion for small Bi-doping (x⩽0.035) (region I) and a normal forx⩾0.1(region II); this is accompanied by transition from insulating (and magnetically ordered) to metallic with no magnetic ordering) ground state. Here, we investigate using hard x-ray photoemission spectroscopy absorption fine structure (XAFS) spectroscopy. By analyzing the Eu-L3, Ir-L3and Bi-L2&L3edges near edge spectra Eu-3dcore-level...
Enhancing the strength of optical absorption represents an important route toward improving energy-efficiency light-based technologies. Here, we experimentally and numerically explore how silicon substrates—long considered to be mere supporting structures for CMOS-compatible materials—can exploited improve in mid- far-infrared spectral ranges, thus reducing energy requirement all-optical switching magnetization. We show that infrared illumination metal through a 500 μm-thick substrate...
Eu2Ir2O7, a candidate Weyl semimetal, shows an insulator-to-metal transition as function of Bi substitution at the Eu site. In this work, we investigate (Eu_1-xBi_x)2Ir2O7 series via Hard X-ray Photoemission Spectroscopy (HAXPES), where larger Bi3+ for Eu3+ is reported to result in anomalous lattice contraction (20 %) low doping (3.5 %). Using HAXPES, confirm that all cations retain their nominal valence state throughout series. The asymmetric nature core-level spectra compositions metallic...
We investigate the structural and physical properties of pyrochlores Eu2-xBi2xIr2O7 (x = 0, 0.05, 0.1, 0.25, 0.5, 0.75 1). found that lattice parameters compositions close to Eu2Ir2O7 end (i.e., x < 0.1) do not follow a regular increase as expected due bigger ionic size Bi3+ compared Eu3+. Measurement properties, including, resistivity magnetic susceptibility showed strong structure-property correlation in 0.1 doping range. Above this level, show linear increase, behavior series quickly...