A5090164284- Magnetic properties of thin films
- Protein purification and stability
- Freezing and Crystallization Processes
- Advanced Memory and Neural Computing
- Magneto-Optical Properties and Applications
- Heat Transfer and Optimization
- Characterization and Applications of Magnetic Nanoparticles
- Plasmonic and Surface Plasmon Research
- Advanced Combustion Engine Technologies
- Theoretical and Computational Physics
- Mechanical Failure Analysis and Simulation
- Nanofabrication and Lithography Techniques
- Viral Infectious Diseases and Gene Expression in Insects
- Mechanical Engineering and Vibrations Research
- Magnetic Properties and Applications
- Food Drying and Modeling
- Advanced Chemical Sensor Technologies
- Food Supply Chain Traceability
- Crystallization and Solubility Studies
- Quantum and electron transport phenomena
- Gas Dynamics and Kinetic Theory
- Microencapsulation and Drying Processes
- Heat Transfer and Boiling Studies
- Drug Solubulity and Delivery Systems
- Magnetic and transport properties of perovskites and related materials
Dwarkadas J. Sanghvi College of Engineering
2024
Khalifa University of Science and Technology
2021-2023
Institute of Management Accountants
2016-2023
King Abdullah University of Science and Technology
2020-2021
S.N. Bose National Centre for Basic Sciences
2012-2017
Mahindra Group (India)
2015-2016
Purdue University West Lafayette
2009-2016
John Wiley & Sons (Germany)
2016
Dr. M.G.R. Educational and Research Institute
2012
National Institute of Technology Durgapur
2011
The evolution of damping in Co/Pt, Co/Au, and ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$/Pt bilayers was studied with increasing nonmagnetic (NM) heavy-metal layer thicknesses the range $0.2\phantom{\rule{0.28em}{0ex}}\phantom{\rule{4pt}{0ex}}\mathrm{nm}\ensuremath{\le}{t}_{\mathrm{NM}}\ensuremath{\le}10\phantom{\rule{0.28em}{0ex}}\phantom{\rule{4pt}{0ex}}\mathrm{nm}$, where ${t}_{\mathrm{NM}}$ is NM thickness. Magnetization precession measured time domain using time-resolved magneto-optical...
The spin Hall angle of Pt in Co75Fe25/Pt bilayer films was experimentally investigated by means the spin-torque ferromagnetic resonance and modulation damping measurements. By comparing present results with Ni80Fe20/Pt system, we found that layer underneath one greatly affects estimation angle. We also discuss diffusion length thickness dependence Gilbert coefficient.
The development of advanced spintronics devices hinges on the efficient generation and utilization pure spin current. In materials with large spin-orbit coupling, Hall effect may convert charge current to current, a conversion efficiency, which is quantified by angle (SHA), desirable for realization miniaturized energy-efficient spintronic devices. Here, we report giant SHA in beta-tungsten (\ensuremath{\beta}-W) thin films...
Abstract Interface modification for control of ultrafast magnetic properties using low-dose focused ion beam irradiation is demonstrated bilayers two technologically important materials: Ni 81 Fe 19 and Pt. Magnetization dynamics were studied an all-optical time-resolved magneto-optical Kerr microscopy method. relaxation, precession, damping the spatial coherence magnetization studied. precession was fitted with a single-mode damped sinusoid to extract Gilbert parameter. A systematic study...
We report the polarizing behavior of aligned Ni nanoparticles (NPs) having average diameter 165±15 nm in ~210 μm thick polyvinyl alcohol (PVA) matrix frequency range 0.2-1.6 THz. The NPs have been prepared via a wet chemical route and then PVA film by using an external magnetic field. When polarization THz electric field is parallel to alignment direction, strong absorption observed whereas minimum noticed for corresponding perpendicular configuration. Degree calculated be 0.9±0.08....
The effect of spin torque from the Hall in Pt/Ni81Fe19 rectangular bilayer film was investigated using time-resolved magneto-optical Kerr microscopy. Current flow through stack resulted a linear variation effective damping up to ±7%, attributed current injection Pt into Ni81Fe19. angle estimated as 0.11 ± 0.03. modulation depended on between and bias magnetic field. These results demonstrate importance optical detection precessional magnetization dynamics for studying transfer due effect.
The influence of interfacial intermixing on the picosecond magnetization dynamics ferromagnetic/non-magnetic thin-film bilayers was studied. Low-dose focused-ion-beam irradiation used to induce across interface between a 10 nm Ni81Fe19 layer and 2–3 capping either Au or Cr. Time-resolved magneto-optical Kerr effect study as function ion-beam dose. With an cap, damping un-irradiated bilayer comparable with native increased increasing ion In contrast, for Ni81Fe19/Cr higher than that Ni81Fe19,...
The direct imaging of current density vector distributions in thin films has remained a daring challenge. Here, we report that an inhomogeneous distribution can be mapped directly by the trajectories magnetic half-skyrmions driven electrical Pt/Co/Ta trilayer, using polar magneto-optical Kerr microscopy. half-skyrmion carries topological charge 0.5 due to presence Dzyaloshinskii-Moriya interaction, which leads Hall effect. angle is independent and reduced as small 4° tuning thickness Co...
We present the magnetization reversal dynamics in one-dimensional chains of single domain nickel nanoparticles about 50 nm diameters. Experimental results show that is mainly governed by overall shape and typical easy-axis hard-axis like magnetic hysteresis loops are observed when field applied parallel perpendicular to length chains. Micromagnetic simulations on a chain composed 20 reasonable qualitative agreement with experimental results. In this case starts from edges progresses towards...
Abstract Best practices for performing freeze dryer equipment qualification are recommended, focusing on identifying methods to quantify shelf thermal uniformity (also known as “shelf surface uniformity”), capability, and performance metrics of the essential pharmaceutical Quality by Design paradigm. Specific guidelines temperature mapping, limit testing (the capability curve), condenser have been provided. Concerning mapping measurements, importance paying attention test setup use...
Mass Spectrometry has commonly been used in the semi-conductor industry where maintaining a clean environment with minimum contaminants under high vacuum is crucial for successful manufacturing. Since technology's early usage pharmaceutical manufacturing 1980 s, particularly freeze-drying environment, much changed. The focus of current work aimed at asking some key questions regarding maturity technology, its challenges and importance having an application-specific instrument quantitative...
We report the magnetization reversal modes in hexagonal cobalt microplatelets prepared via solvothermal chemical synthesis method. Experimental results do not reflect any effect of anisotropy due to shape an individual platelet and overall geometry ensemble platelets. Micromagnetic simulations on a single demonstrate different kinds depending upon direction applied magnetic field, whereas for group three platelets are manifested slightly modified form weak magnetostatic interactions among...
This work presents the design, fabrication, and characterization of a wireless, low-power, multi-point temperature sensor system for process monitoring applications. is particularly useful low-temperature applications commonly found in pharmaceutical food processing plants where accurate over long time intervals (e.g. days) necessary. Using capacitive elements, wireless three-point measurement liquid has been successfully demonstrated. The tested down to 55°C achieves resolution <;0.01°C....
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Arnab Ganguly, A. Venkattraman, Alina Alexeenko; Simulations of Vapor/Ice Dynamics in a Freeze‐Dryer Condenser. AIP Conference Proceedings 20 May 2011; 1333 (1): 254–259. https://doi.org/10.1063/1.3562657 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks...