A5066530066- Magnetic properties of thin films
- Magnetic Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- ZnO doping and properties
- Advanced Memory and Neural Computing
- Magneto-Optical Properties and Applications
- Theoretical and Computational Physics
- Ferroelectric and Piezoelectric Materials
- Advanced X-ray Imaging Techniques
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Advanced Electron Microscopy Techniques and Applications
- Crystallography and Radiation Phenomena
- Transition Metal Oxide Nanomaterials
- Dielectric properties of ceramics
- Magnetic Properties and Synthesis of Ferrites
- Integrated Circuits and Semiconductor Failure Analysis
- Electrodeposition and Electroless Coatings
- Heusler alloys: electronic and magnetic properties
- MXene and MAX Phase Materials
- Phase-change materials and chalcogenides
- Force Microscopy Techniques and Applications
Indian Institute of Technology Hyderabad
2016-2025
Siksha O Anusandhan University
2023-2024
MNR Medical College and Hospital
2019
Technische Universität Berlin
2012-2015
University of Manchester
2015
University of California, San Diego
2011-2014
Laboratoire de physique des Solides
2012-2013
KU Leuven
2012-2013
Indian Institute of Technology Bhubaneswar
2012
Nalanda University
2011
During ultrafast demagnetization of a magnetically ordered solid, angular momentum has to be transferred between the spins, electrons, and phonons in system on femto- picosecond timescales. Although intrinsic spin-transfer mechanisms are intensely debated, additional extrinsic arising due nanoscale heterogeneity have only recently entered discussion. Here we use femtosecond X-ray pulses from free-electron laser study thin film samples with magnetic domain patterns. We observe an...
We present the first single-shot images of ferromagnetic, nanoscale spin order taken with femtosecond x-ray pulses. X-ray-induced electron and dynamics can be outrun pulses shorter than 80 fs in investigated fluence regime, no permanent aftereffects samples are observed below a 25 mJ/cm2. Employing resonant spatially muliplexed holography results low imaging threshold 5 Our open new ways to combine ultrafast laser spectroscopy sequential snapshot on single sample, generating movie excited...
Understanding electronic structure at the nanoscale is crucial to untangling fundamental physics puzzles such as phase separation and emergent behavior in complex magnetic oxides. Probes with ability see beyond surfaces on nanometer length subpicosecond time scales can greatly enhance our understanding of these systems will undoubtedly impact development future information technologies. Polarized X-rays are an appealing choice probe due their penetrating power, elemental specificity, high...
An enhancement of the spin-orbit effects arising on an interface between a ferromagnet (FM) and heavy metal (HM) is possible through strong breaking structural inversion symmetry in layered films. Here, we show that introduction ultrathin W interlayer Co Ru Ru/Co/Ru films enables to preserve perpendicular magnetic anisotropy (PMA) simultaneously induce large interfacial Dzyaloshinskii-Moriya interaction (iDMI). The study spin-wave propagation Damon-Eshbach geometry by Brillouin light...
Multiferroic Y-doped BiFeO3 (BY10FO) thin films were deposited on FTO coated glass substrate using sol-gel spin coating technique. Y-doping causes structural distortion without changing the structure of parent (rhombohedral: R3c). The M-H hysteresis curve reveals that BY10FO film exhibits saturation magnetization at a low-coercive field by suppressing spiral modulated structure. bipolar resistive switching behavior has been investigated Ag/BY10FO/FTO hetero-structure through conventional I-V...
We present results of single-shot resonant magnetic scattering experiments Co/Pt multilayer systems using 100 fs long ultraintense pulses from an extreme ultraviolet (XUV) free-electron laser. An x-ray-induced breakdown the channel during pulse duration is observed at fluences 5 J/cm(2). Simultaneously, speckle contrast high-fluence pattern significantly reduced. performed simulations nonequilibrium evolution system XUV duration. find that electronic state sample strongly perturbed first few...
We report the effects of magnetic field on resistive switching behavior in Ag/BiFeO3/FTO RRAM device through conventional I–V characteristics. The from a high resistance state (HRS) to low (LRS) at certain threshold voltage (Vt) evidences shift under influence. shifting Vt toward higher is due appearance Lorentz force and magnetoelectric effect when applied perpendicular flow current. HRS LRS increases simultaneously application induced Hall effect. OFF/ON ratio∼12, which repeatable for 100...
Neuromorphic processors using artificial neural networks are the center of attention for energy-efficient analog computing. Artificial synapses act as building blocks in such parallel information processing and data storage. Herein we describe fabrication a proton-gated synaptic transistor Nafion electrolyte thin film, which is patterned by electron-beam lithography (EBL). The device has an active channel indium-zinc-oxide (IZO) between source drain electrodes, shows Ohmic behavior with...
Abstract In view of their advantages for memory and storage applications, the quest to find suitable magnetic thin film heterostructures that can exhibit strong spin pumping effect persists in scientific community. Here, phenomenon is investigated Galfenol (FeGa) films by systematically varying thickness heavy metallic Ta underlayer (UL). The soft properties with a bcc‐phase notably low Gilbert damping obtained FeGa on Si (100). precessional magnetization dynamics Ta/FeGa are explored using...
In view of their advantages for memory and storage applications, the quest to find suitable magnetic thin film heterostructures that can exhibit strong spin pumping effect persists in scientific community. Here, we investigate phenomenon Galfenol (FeGa) films by systematically varying thickness heavy metallic Ta underlayer (UL). Films soft properties with a bcc-phase notably low Gilbert damping is obtained FeGa on Si (100). Further, explore precessional dynamics Ta/FeGa using time-resolved...
Magnetic skyrmions are stable spin textures with quasi-particle behavior and attract significant interest in fundamental applied physics. The metastability of magnetic at zero field is particularly important to enable, for instance, a skyrmion racetrack memory. Here, the results nucleation formation ordered lattices by force microscopy (Pt/CoFeSiB/W)n multilayers, exploiting additive effect interfacial Dzyaloshinskii-Moriya interaction, presented. appropriate conditions under which confined...
Poly(ethylene glycol) (PEG), known for its biocompatibility and biodegradability, has been in use surface coating of nanoparticles. PEG prevents opsonization, thereby enhancing the systemic circulation time It is nonfluorescent nature requiring additional conjugation with fluorescent dye molecules tracking In current work, was converted into (FL PEG) through a facile one-pot synthesis approach. This eliminates need tag FL showed excellent normal cell lines (L929). There delayed uptake by...
Strain-mediated magnetism in 2D materials and dilute magnetic semiconductors hold multi-functional applications for future nano-electronics. Herein, First principles calculations are employed to study the influence of biaxial strain on properties Co-doped monolayer [Formula: see text]. The non-magnetic text] shows ferromagnetic signature upon Co doping due spin polarization, which is further improved at low compressive (-2 %) tensile (+2 strains. From PDOS density analysis, opposite ordering...
We present variable-temperature magnetic force microscopy (VT-MFM) studies of epitaxially grown MnAs films on GaAs(001). Around a critical temperature Tc=40 °C, the film undergoes first order structural phase transition. Due to strain involved, ferromagnetic α-MnAs and paramagnetic β-MnAs phases coexist as stripes along MnAs[0001]. The dimensions α-phase change from isolated dots at higher temperatures well ordered lower temperatures. VT-MFM allows close look evolution domain patterns micromagnets.
Over a wide temperature range of 30 °C around room temperature, MnAs films on GaAs(001) semiconductor substrates break up into ordered arrays submicron-sized ferromagnetic α and paramagnetic β wires. Both the hard easy axis magnetization (perpendicular to wires) lie in film plane large variety complex domain patterns are found micromagnetic investigations with magnetic force microscopy (MFM). A systematic analysis configurations is given most likely identified through MFM contrast simulations.
Systematic studies of as-grown MnAs films deposited by molecular-beam epitaxy on GaAs(001) and GaAs(113)A reveal that their magnetic properties and, in particular, saturation magnetization are determined the phase separation into stripes ferromagnetic α-MnAs paramagnetic β-MnAs. Using a specific MS*, which refers to actual volume α-MnAs, thickness dependence MS* can be described universal way. It is due variation stripe structure changing intra- interstripe interaction. Values well above...
MnAs films were deposited by molecular-beam epitaxy on GaAs(001) and GaAs(111)B surfaces. Imaging of the temperature-dependent magnetic structure x-ray circular dichroism photoemission electron microscopy, comparison with magnetization measurements superconducting quantum interference device (SQUID) magnetometry, is used to study impact different strain state MnAs/GaAs(001) MnAs/GaAs(111)B phase transition between ferromagnetic α-MnAs paramagnetic β-MnAs, spatial distribution two structural...