A5037456274- Graphene research and applications
- Shape Memory Alloy Transformations
- Magnetic and transport properties of perovskites and related materials
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Magnetic properties of thin films
- Diamond and Carbon-based Materials Research
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- 2D Materials and Applications
- Microstructure and Mechanical Properties of Steels
- Advanced Memory and Neural Computing
- Electronic and Structural Properties of Oxides
- Magnetic Properties and Synthesis of Ferrites
- Multiferroics and related materials
- Quantum optics and atomic interactions
- Quantum-Dot Cellular Automata
- Ferroelectric and Negative Capacitance Devices
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
- Heusler alloys: electronic and magnetic properties
- Advanced Condensed Matter Physics
- Carbon Nanotubes in Composites
- Electrochemical sensors and biosensors
- Metallic Glasses and Amorphous Alloys
University of Basel
2022-2025
Weizmann Institute of Science
2017-2021
Saha Institute of Nuclear Physics
2013-2020
Delft University of Technology
2018
UGC DAE Consortium for Scientific Research
2014
Jadavpur University
2014
Herein, we report a comprehensive and comparative study on the crystal structure, microstructural, optical, magnetic, hyperfine electrochemical properties of Fe3O4 microspheres (S1) diameter ∼418 nm Fe3O4@SiO2 core-shell (S2) ∼570 nm. Each asymmetric unit crystalline has one cation vacancy at octahedral [B] site. At 300 K saturation magnetization coercivity ferrimagnetically ordered S1 S2 are 63.5, 38.5 emu g(-1) 200 120 Oe, respectively. We have shown that synthesis procedure, morphology,...
Watching electrons lose steam in graphene Although can be fabricated to extremely clean, it still has a nonzero electrical resistance. Resistance is associated with turning electrons' energy into heat, but how exactly does this happen? Halbertal et al. used tiny scanning temperature probe based on superconducting quantum interference device investigate problem. As the current flowed through square-shaped sample of graphene, lost predominantly vicinity atomic-scale defects, which were few and...
Scanning superconducting quantum interference device (SQUID) microscopy is a magnetic imaging technique combining high-field sensitivity with nanometer-scale spatial resolution. State-of-the-art SQUID-on-tip probes are now playing an important role in mapping correlation phenomena, such as superconductivity and magnetism, which have recently been observed two-dimensional van der Waals materials. Here, we demonstrate scanning probe that combines the thermal provided by on-tip SQUID tip-sample...
The inhomogeneous magnetic stray field of micromagnets has been extensively used to manipulate electron spin qubits. By means micromagnetic simulations and scanning superconducting quantum interference device microscopy, we show that the polycrystallinity magnet nonuniform magnetization significantly impact corresponding qubit properties. random orientation crystal axis in polycrystalline Co magnets alters frequencies by up 0.5 GHz, compromising single addressability gate fidelities. We map...
We report the observation of enhanced magnetization in graphene oxide (GO) after thermal annealing. have also proposed that this enhancement is due to increased density zigzag edges. conjecture on annealing random epoxy groups native GO migrate over surface by acquiring energy and self-assemble form several long chains groups. Subsequently, upon reduction sheet unzipped along these giving rise more edges, resulting magnetization. found out plays an important role unzipping process. If low,...
Abstract Magnetic ordering in two-dimensional (2D) materials has recently emerged as a promising platform for data storage, computing, and sensing. To advance these developments, it is vital to gain detailed understanding of how the magnetic order evolves on nanometer-scale function number atomic layers applied field. Here, we image few-layer Cr 2 Ge Te 6 using combined scanning superconducting quantum interference device force microscopy probe. Maps material’s stray field reveal its...
In this report we present the temperature evolution of magnetic coercivity graphene oxide (GO) and reduced (RGO). We an anamolous decrease in GO RGO with decreasing temperature. could explain behavior invoking inherent presence ripple graphene. observe antiferromagnetic ferromagnetic at room for respectively, but low temperatures both shows paramagnetic behavior.
Simultaneous transport and scanning nanoSQUID-on-tip magnetic imaging studies in Cr-(Bi,Sb)$_2$Te$_3$ modulation-doped films reveal the presence of superparamagnetic order within quantum anomalous Hall regime. In contrast to expectation that a long-range ferromagnetic is required for establishing state, dynamics weakly interacting nanoscale islands observed both plateau transition regions as well fully quantized C=$\pm$1 Chern plateaus. Modulation doping topological insulator found give rise...
Scanning nanoscale superconducting quantum interference devices (SQUIDs) are gaining interest as highly sensitive microscopic magnetic and thermal characterization tools of topological states matter devices. Here we introduce a novel technique collimated differential-pressure magnetron sputtering for versatile self aligned fabrication SQUID on tip (SOT) nanodevices, which cannot be produced by conventional methods due to their diffusive, rather than the required directional point-source,...
Two-dimensional materials are extraordinarily sensitive to external stimuli, making them ideal for studying fundamental properties and engineering devices with new functionalities. One such stimulus, strain, affects the magnetic of layered semiconductor CrSBr a degree that it can induce reversible antiferromagnetic-to-ferromagnetic phase transition. Using scanning SQUID-on-lever microscopy, we directly image effects spatially inhomogeneous strain on magnetization CrSBr, as is polarized by...
The authors find that for mechanically milled Ni0.5Zn0.5Fe2O4 (∼10 nm), the mechanical strain induced enhancement of anisotropy energy helps to retain stable magnetic order. reduction magnetization can be prevented by keeping cation distribution nanometric ferrites at its equilibrium ratio. Moreover, sample used in coding, storing, and retrieving binary bit (“0” “1”) through field change.
The magnetic ground state of the Mn50Ni38.5Sn11.5 alloy is investigated through dc/ac magnetization and low-temperature specific-heat measurements. dc ac measurements indicate that system can be identified as a cluster spin glass (CSG) phase in ferromagnetic (FM) background, conjunction these two phases an exchange bias effect (EBE) observed this system. presence coexisting further supported by our measurement. We attribute existence CSG to antiferromagnetic (AFM) interaction arising from...
The Ni50Mn37Sb13 ribbons were prepared by melt-spinning technique to overcome the brittleness of bulk. A single phase austenite with L21 structure was confirmed in as-spun and annealed at room temperature similar We observe increments martensite transformation (TM) from 238 K 252 Curie (TCA) 336 342 after annealing ribbon. exchange bias, magnetic entropy change (ΔSM), magnetoresistance are found increase 380 Oe 415 Oe, 1 J/kg-K 3 (ΔH=50 kOe), −4% −13% respectively, possible reasons for...
We demonstrate the fabrication of scanning superconducting quantum interference devices (SQUIDs) on apex sharp quartz probes -- known as SQUID-on-tip using conventional magnetron sputtering. produce and characterize SQUID-on-tips made both Nb MoGe with effective diameters ranging from 50 to 80 nm, magnetic flux noise down \SI{300}{\nano\Phi_{0}/\sqrt{\hertz}}, operating fields high \SI{2.5}{\tesla}. Compared techniques used until now, including thermal evaporation collimated sputtering, this...
In this investigation we show that the optimum substitution of Ni by Co and Cu can bring martensite transition temperature (TM = 390 K) Ni46Mn43In11 alloy close to room as well greatly influence applicable magnetic transport properties. contrast parent alloy, a ferromagnetic austenite phase is induced in these substituted alloys. A huge exchange bias field up 1615 Oe was observed for field-cooled hysteresis loop at 5 K Ni44Cu2Mn43In11 alloy. giant entropy change 20.8 J kg−1K−1 70 kOe...
Abstract The influence of martensite and austenite phase volume fractions on the magnetoresistance have been studied across first order transformation Ni 44 Cu 2 Mn 43 In 11 compound. different are calculated by measuring resistivity as a function temperature magnetic field. Our experiment reveals that field-induced fraction ( f IA ) at any depends availability instability M temperature. This is found to contribute most significantly observed large (MR), while contributions from parent...
In this report, we present a systematic study of magnetic behavior transition metal (TM = Fe or Cu) doped ZnO and co-doped (Cu, Fe) nanoparticles. All the samples show antiferromagnetic (AFM) like inverse susceptibility at low temperatures. all AFM Curie-Weiss temperature TAFM increases with increase in TM ion concentration indicating enhanced correlation upon doping. We observe crossover from state to ferromagnetic around (T) 100–150 K. shall try explain experimental observations by...