A5031847763- Copper-based nanomaterials and applications
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- ZnO doping and properties
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Quantum Dots Synthesis And Properties
- Multiferroics and related materials
- Nanomaterials for catalytic reactions
- Chalcogenide Semiconductor Thin Films
- Topological Materials and Phenomena
- Surface and Thin Film Phenomena
- Gas Sensing Nanomaterials and Sensors
- Theoretical and Computational Physics
- Catalytic Processes in Materials Science
- Solid-state spectroscopy and crystallography
- Advanced Thermoelectric Materials and Devices
- 2D Materials and Applications
- Heusler alloys: electronic and magnetic properties
- Iron oxide chemistry and applications
- Quantum and electron transport phenomena
- Plasmonic and Surface Plasmon Research
- Nonlinear Optical Materials Studies
- Magnetic Properties and Synthesis of Ferrites
IIT@MIT
2025
Auburn University
2024
Western Michigan University
2024
University of Wyoming
2016-2023
Rutgers, The State University of New Jersey
2019-2023
Oak Ridge National Laboratory
2022
Los Alamos National Laboratory
2022
Center for Integrated Nanotechnologies
2022
Rutgers Sexual and Reproductive Health and Rights
2020
Wyoming Department of Education
2018
As an in-plane charge current flows in a heavy metal film with spin-orbit coupling, it produces torque on and thereby switches the magnetization neighbouring ferromagnetic film. Such (SOT)-induced switching has been studied extensively recent years shown higher efficiency than using conventional spin-transfer torque. Here we report SOT-assisted metal/magnetic insulator systems. The experiments used Pt/BaFe12O19 bilayer where BaFe12O19 layer exhibits perpendicular magnetic anisotropy. is...
With a topological insulator/magnetic insulator bilayer, we demonstrate surface state–driven magnetization switching.
Abstract Molecular beam epitaxy (MBE), a workhorse of the semiconductor industry, has progressed rapidly in last few decades development novel materials. Recent developments condensed matter and materials physics have seen rise many quantum that require ultra-clean high-quality samples for fundamental studies applications. Novel oxide-based synthesized using MBE advanced field In this review, we discuss recent progress new techniques enabled synthesis complex oxides exhibit ‘quantum’...
The field of spintronics has seen a surge interest in altermagnetism due to novel predictions and many possible applications. MnTe is leading altermagnetic candidate that significant across its layered antiferromagnetic structure, high Neel temperature (TN ~ 310 K) semiconducting properties. We present results on molecular beam epitaxy (MBE) grown MnTe/InP(111) films. Here, it found the electronic magnetic properties are driven by natural stoichiometry MnTe. Electronic transport situ...
The Pd, and Pt based ABO2 delafossites are a unique class of layered, triangular oxides with 2D electronic structure large conductivity that rivals the noble metals. Here, we report successful growth metallic delafossite PdCoO2 by molecular beam epitaxy (MBE). key challenge is controlling oxidation Pd in MBE environment where phase-segregation driven reduction to cobalt oxide palladium. This overcome combining low temperature (300 {\deg}C) atomic layer-by-layer presence reactive oxygen...
A topological insulator (TI) interfaced with a magnetic (MI) may host an anomalous Hall effect (AHE), quantum AHE, and (THE). Recent studies, however, suggest that coexisting phases in TI/MI heterostructures result AHE-associated response resembles THE but fact is not. This Letter reports genuine structure has only one phase. The shows the temperature range of T = 2–3 K AHE at 80–300 K. Over 3–80 K, two effects coexist show opposite dependencies. Control measurements, calculations,...
The large spin-orbit coupling in iridium oxides plays a significant role driving novel physical behaviors, including emergent phenomena the films and heterostructures of perovskite Ruddlesden-Popper iridates. In this Letter, we study epitaxial strain on electronic behavior thin ${\mathrm{SrIrO}}_{3}$ films. We find that compressive leads to metallic transport behavior, but slight tensile shows gapped behavior. Temperature-dependent resistivity measurements are used examine different...
Magnetic nanocomposites have attracted increasing attention due to its widely applications in different areas recent years. The conventional synthesis of magnetic is usually based on high temperature annealing technique from biomass. In this paper, a microwave method has been developed prepare iron oxide using ferric acetylacetonate ((Fe(acac)3), oleylamine (OAm), oleic acid (OA), and commercial biochar. reaction completed several minutes. Composite structure composed γ-Fe2O3 nanoparticles...
A huge enhancement in the incident photon-to-current efficiency of PbS quantum dot (QD) sensitized solar cells by manganese doping is observed. In presence Mn dopants with relatively small concentration (4 at. %), photoelectric current increases an average 300% (up to 700%). This effect cannot be explained light absorption mechanism because both experimental and theoretical spectra demonstrate several times decreases coefficient. To explain such dramatic increase photocurrent we propose...
Magnetic nanoparticles are of great interest due to their applications in energy and environment. In this work, we developed a chemical solution based method synthesize NiFe2O4 (NFO) with different sizes structures by organic ligands studied magnetic electrolyte concentration cells waste water treatment. NFO nanoparticle growth is controlled the passivating ligand ratios, reaction temperatures, concentrations achieve control size ranging from 25 nm 160 nm. The mechanism aggregation related...
Nanowires are a promising option for sensitized solar cells, sensors, and display technology. Most of the work thus far has focused on binary oxides these nanowires, but ternary have advantages in additional control optical electronic properties. Here, we report diffuse reflectance, Low Temperature Room Photoluminescence (PL), PL excitation spectrum, Time Resolved (TRPL) Zinc Tin Oxide (ZTO) nanowires grown by Chemical Vapor Deposition. The from ZTO does not exhibit any band gap or near...
The effects of doping Mn into ZnS and CdS quantum dots (QDs) are reported. Scanning tunneling spectroscopy spectra show a reduction in the electronic band gap both upon incorporation dopant. Mn:ZnS exhibits rigid shift toward higher bias, which is reminiscent hole-doping effect. This argued, with help X-ray photoelectron spectroscopy, to be due mechanism caused by favorable formation Zn vacancies S compared that undoped films. In CdS, no observed even though presence Cd can confirmed...
Dilute magnetic semiconductors (DMSs) are typically made by doping with transition metal elements. Compared to the well-understood bulk and thin film DMS, understanding of element effects in semiconducting quantum dots (QDs) is relatively poor. In particular, influence dopant locations rarely explored. Here, we present a comprehensive study Mn on electronic density states PbS QDs. Based results observed scanning tunneling microscopy, X-ray diffraction, electron paramagnetic resonance,...
The current challenge to realizing continuously tunable magnetism lies in our inability systematically change properties, such as valence, spin, and orbital degrees of freedom, well crystallographic geometry. Here, we demonstrate that ferromagnetism can be externally turned on with the application low-energy helium implantation subsequently erased returned pristine state via annealing. This high level continuous control is made possible by targeting magnetic metastability...
Abstract When a three-dimensional material is constructed by stacking different two-dimensional layers into an ordered structure, new and unique physical properties can emerge. An example the delafossite PdCoO 2 , which consists of alternating metallic Pd Mott-insulating CoO sheets. To understand nature electronic coupling between that gives rise to we revealed its layer-resolved structure combining standing-wave X-ray photoemission spectroscopy ab initio many-body calculations....
Abstract PdCoO 2 layered delafossite is the most conductive compound among metallic oxides, with a room-temperature resistivity of nearly $$2\,\mu \Omega \,{{{{{\rm{cm}}}}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>2</mml:mn> <mml:mspace /> <mml:mi>μ</mml:mi> <mml:mi>Ω</mml:mi> <mml:mi>cm</mml:mi> </mml:math> , corresponding to mean free path about 600 Å. These values represent record considering that charge density three times lower than copper. Although its...
Abstract We investigate the low temperature electron transport properties of manganese doped lead sulfide films. The system shows variable range hopping at temperatures that crosses over into an activation regime even lower temperatures. This crossover is destroyed by applied magnetic field which suggests a origin hard gap, associated with bound polarons. Even though gap forms around superconducting transition lead, we do not find evidence this being due to insulator-superconductor...
Utilizing pulsed laser deposition, a film of EuO1–x was deposited onto Si(001) substrate with MgO buffer and compared to the same heterostructure an additional BaTi2O5 thin on top surface. X-ray diffraction (XRD) indicates films crystallize into preferred EuO(111) orientation; it also reveals clear presence EuSi2, which suggests Si or Eu diffuses across layer. exhibit ferromagnetic (FM) signature temperature-dependent exchange bias, indicated by MOKE measurements, suggesting magnetic order...
We report proximity effects of spin-orbit coupling in ${\mathrm{EuO}}_{1\ensuremath{-}\mathrm{x}}$ films capped with a Pt overlayer. Transport measurements suggest that current flows along conducting channel at the interface between and EuO. The temperature dependence resistivity picks up critical behaviors EuO, i.e., metal-to-insulator transition. also find an unusual enhancement magnetic anisotropy this structure from its bulk value, which results strong across...
Because of the importance ferromagnetism at room temperature, we search for new materials that can exhibit a non-vanishing magnetic moment temperature and same time be used in spintronics. The experimental results indicate d0 without any impurities takes place PbS films made close-packed lead sulfide nanoparticles 30 nm. To explain existence ferromagnetism, propose model where various bulk surface configurations Pb-vacancies are analyzed. have zero while two with Pb vacancies moments lowest...
The large spin-orbit coupling in iridium oxides plays a significant role driving novel physical behaviors, including emergent phenomena the films and heterostructures of perovskite Ruddlesden-Popper iridates. In this work, we study epitaxial strain on electronic behavior thin SrIrO$_3$ films. We find that compressive leads to metallic transport behavior, but slight tensile shows gapped behavior. Temperature-dependent resistivity measurements are used examine different behaviors as function...
Abstract The field of spintronics has seen a surge interest in altermagnetism due to novel predictions and many possible applications. MnTe is leading altermagnetic candidate that significant across its layered antiferromagnetic structure, high Neel temperature ( T N ≈ 310 K) semiconducting properties. results on molecular beam epitaxy (MBE) grown MnTe/InP(111) films are presented. Here, it found the electronic magnetic properties driven by natural stoichiometry MnTe. Electronic transport...