A5081186363- Magnetic properties of thin films
- Magnetic Properties and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Quantum and electron transport phenomena
- Terahertz technology and applications
- Magneto-Optical Properties and Applications
- Microwave Engineering and Waveguides
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Thermal Radiation and Cooling Technologies
- Superconducting and THz Device Technology
- Geomagnetism and Paleomagnetism Studies
- Magnetic Properties of Alloys
- Atomic and Subatomic Physics Research
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Nonlinear Dynamics and Pattern Formation
- Crystallography and Radiation Phenomena
- Quantum optics and atomic interactions
- Metamaterials and Metasurfaces Applications
Stockholm University
2020-2022
S.N. Bose National Centre for Basic Sciences
2016-2017
We have numerically solved the Landau-Lifshitz-Gilbert (LLG) equation in its standard and inertial forms to study magnetization switching dynamics a $3d$ thin film ferromagnet. The is triggered by ultrashort magnetic field pulses of varying width amplitude picosecond Tesla range. compared solutions two equations terms characteristic, speed energy analysis. Both return qualitatively similar dynamics, characterized regions slower precessional behavior faster ballistic motion. In case found 25...
In the present contribution we have experimentally demonstrated diameter dependence of terahertz (THz) shielding and THz conductivity multiwalled carbon nanotubes (MWNTs) performed detailed theoretical analysis to extract mechanism at different MWNT diameters. Self-standing films three types having same average length but outer tube (namely, MWNT_7, MWNT_25, MWNT_40 nm) are prepared by vacuum filtration technique. The effectiveness (SE) these in frequency range 0.4–2.2 is measured room...
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, chemistry biology, giving researchers access X-rays with unprecedented brightness, coherence and pulse duration. All XFEL facilities built until recently provided pulses at a relatively low repetition rate, limited data statistics. Here, results the first megahertz-repetition-rate scattering experiments Spectroscopy Coherent Scattering (SCS) instrument European...
We study the charge and spin dependent scattering in a set of CoFeB thin films whose crystalline order is systematically enhanced controlled by annealing at increasingly higher temperatures. Terahertz conductivity measurements reveal that transport closely follows development phase, with increasing structural leading to conductivity. The terahertz-induced ultrafast demagnetization, driven spin-flip mediated spin–orbit interaction, measurable pristine amorphous sample much reduced highest...
We report the use of micrometer-sized copper (Cu) anti-dot structures as a novel terahertz (THz) anti-reflection coating (ARC) material and their superior performance over conventionally used metallic thin films. Cu two different thicknesses (7 10 nm) with varying diameters (100, 200, 300 μm, inter-anti-dot separation fixed at 100 μm) are deposited on silicon substrates by RF magnetron sputtering e-beam evaporation. The these samples is studied in frequency range 0.3-2.2 THz. While...
Demagnetization in a thin film due to terahertz pulse of magnetic field is investigated. Linearized Landau-Lifshitz-Gilbert (LLG) equation the Fourier space describe magnetization dynamics derived, and spin wave time evolution studied. Finally, demagnetization recent experimental observations on similar system compared. As result, marginal role loss established.