Mahmud Reaz

Mahmud Reaz

Cupertino, California, United States
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About

With over seven years of experience in technologist roles, I specialize in the design…

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Experience

  • Microchip Technology Inc. Graphic

    Microchip Technology Inc.

    San Jose, California, United States

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    Nashville Metropolitan Area

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    Nashville Metropolitan Area

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    Springfield, Missouri, United States

Education

  • Vanderbilt University Graphic

    Vanderbilt University

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    Electron transport in semiconductor devices.
    Short-channel effects on transistors.
    Charge generation in semiconductor materials.
    SE and TID tests on system-on-chip.

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    Synthesis, optimization, and characterization of multifunctional nanodevices.

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Licenses & Certifications

Publications

  • Model- and testing-based assurance of cache memory of a single-board computing system in radiation environments

    IEEE Transaction on Nuclear Science (Under Review)

    Radiation-induced error propagation of a single-board computing system is analyzed at the subsystem-level. A single-event measurement procedure is developed that distinguishes data faults from those occurring in instruction memory and pathways.

  • Three-Dimensional Full-Band Monte-Carlo Simulation of Hot-Electron Energy Distributions in Gate-All-Around Si Nanowire MOSFETs

    IEEE Transaction on Electron Devices (Under Review)

    The energy distributions of electrons in gate-all-around (GAA) Si MOSFETs are analyzed using full-band 3D Monte Carlo (MC) simulations. Excellent agreement is obtained with experimental current-voltage characteristics. For these 24-nm gate length devices, the electron distribution features a smeared energy peak with an extended tail. This extension of the tail results primarily from Coulomb scattering within the channel. A fraction of electrons that enter the drain retains their energy…

    The energy distributions of electrons in gate-all-around (GAA) Si MOSFETs are analyzed using full-band 3D Monte Carlo (MC) simulations. Excellent agreement is obtained with experimental current-voltage characteristics. For these 24-nm gate length devices, the electron distribution features a smeared energy peak with an extended tail. This extension of the tail results primarily from Coulomb scattering within the channel. A fraction of electrons that enter the drain retains their energy, resulting in an out-of-equilibrium distribution in the drain region. The simulated density and average energy of the hot electrons correlate well with experimentally observed device degradation. We propose that the interaction of high-energy electrons with hydrogen-passivated phosphorus dopant complexes within the drain may provide an additional pathway for interface-trap formation in these devices.

  • Impacts of through-silicon vias on total-ionizing-dose effects and low-frequency noise in FinFETs

    IEEE Transaction on Nuclear Science (accepted)

    Total-ionizing-dose effects and low-frequency noise are evaluated in advanced bulk FinFETs with and without TSV via-last integration. The presence of the TSVs does not affect threshold voltage, Ion/Ioff, or noise.

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  • ADCs of different structures respond differently to Total Ionization Dose (TID). Dynamic gain and dynamic offset are the key parameters that are sensitive to TID in successive-approximation-register (SAR) ADCs.

    IEEE Transaction on Nuclear Science (Under Review)

    ADCs of different structures respond differently to Total Ionization Dose (TID). Dynamic gain and dynamic offset are the key parameters that are sensitive to TID in successive-approximation-register (SAR) ADCs.

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  • Magneto-luminescent zinc/iron oxide core-shell nanoparticles with tunable magnetic properties

    Physica E: Low-dimensional Systems and Nanostructures

    Core-shell nanospheres with tailorable magnetic properties and strong luminescence promise versatile and efficient biomedical and electronic applications. We report a low-cost sonochemical synthesis of ZnO/iron oxide core-shell nanostructures with tunable magnetic properties. The high-resolution transmission electron microscopy (HRTEM) illustrates the distinguished dispersity of the oxide nanoparticles, whereas elemental profiling using line scan data confirm the formation of the distinguished…

    Core-shell nanospheres with tailorable magnetic properties and strong luminescence promise versatile and efficient biomedical and electronic applications. We report a low-cost sonochemical synthesis of ZnO/iron oxide core-shell nanostructures with tunable magnetic properties. The high-resolution transmission electron microscopy (HRTEM) illustrates the distinguished dispersity of the oxide nanoparticles, whereas elemental profiling using line scan data confirm the formation of the distinguished core and shell phases. Annealing in N2–H2 and Ar–H2 ambient alters the magnetic properties such as coercive field, saturation magnetization, and remnant magnetization within the inverse spinel iron oxide with space group Fd3m. Subtle structural changes between maghemite (γ-Fe2O3) and its reduced form, magnetite (Fe3O4), have been identified in the thin (0.5–3 nm) shell region of atomic dimensions. Structural composition including phase transitions and defect states are investigated using XRD, XPS, and Raman measurements. Coexistence of ferromagnetism (from the shell and characterized by magnetic measurements) and strong luminescence (from ZnO core and obtained from photoluminescence spectroscopy) at room temperature indicates exotic magneto-optical coupling, which is supported by the blue-shifted luminescence spectra. Our approach combining nanotechnology and solid-state chemistry opens a new frontier to the building of innovative nanomaterials for integration, especially multifunctional core-shell oxide nanomaterials.

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  • Overview of Model-Based System Assurance for Spacecraft with Commercial Parts

    NEPP Electronics Technology Workshop

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  • Synthesis, Characterization, and Optimization of Magnetoelectric BaTiO3–Iron Oxide Core–Shell Nanoparticles

    Nanomaterials

    Improvement of magnetic, electronic, optical, and catalytic properties in cutting-edge technologies including drug delivery, energy storage, magnetic transistor, and spintronics requires novel nanomaterials. This article discusses the unique, clean, and homogeneous physiochemical synthesis of BaTiO3/iron oxide core–shell nanoparticles with interfaces between ferroelectric and ferromagnetic materials. High-resolution transmission electron microscopy displayed the distinguished disparity between…

    Improvement of magnetic, electronic, optical, and catalytic properties in cutting-edge technologies including drug delivery, energy storage, magnetic transistor, and spintronics requires novel nanomaterials. This article discusses the unique, clean, and homogeneous physiochemical synthesis of BaTiO3/iron oxide core–shell nanoparticles with interfaces between ferroelectric and ferromagnetic materials. High-resolution transmission electron microscopy displayed the distinguished disparity between the core and shell of the synthesized nanoparticles. Elemental mapping and line scan confirmed the formation of the core–shell structure. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy detected the surface iron oxide phase as maghemite. Rietveld analysis of the X-ray diffraction data labeled the crystallinity and phase purity. This study provides a promising platform for the desirable property development of the futuristic multifunctional nanodevices.

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  • Fabrication and thickness-dependent magnetic studies of tunable multiferroic heterostructures (CFO/LSMO/LAO)

    Applied Physics A

    This study investigates the structural and magnetic properties of LaAlO3(LAO)/La0.7Sr0.3MnO3 (LSMO)/CoFe2O4(CFO) heterostructures grown by pulsed laser deposition. X-ray diffraction analysis illustrates the crystalline oxide growth and the rocking curve measurement along the (200)-peak of LSMO show a small FWHM (0.37°), which indicates an excellent out-of-plane orientation of the film. Transmission electron and scanning electron energy-dispersive X-ray spectroscopy confirms the homogeneous…

    This study investigates the structural and magnetic properties of LaAlO3(LAO)/La0.7Sr0.3MnO3 (LSMO)/CoFe2O4(CFO) heterostructures grown by pulsed laser deposition. X-ray diffraction analysis illustrates the crystalline oxide growth and the rocking curve measurement along the (200)-peak of LSMO show a small FWHM (0.37°), which indicates an excellent out-of-plane orientation of the film. Transmission electron and scanning electron energy-dispersive X-ray spectroscopy confirms the homogeneous distribution of structural and elemental composition of the heterostructure. From the static magnetic measurements in the LSMO films at room temperature, we report the presence of a ferromagnetic hysteresis loop with a coercive field of 327 Oe. In addition, we have examined the effect of CFO layer thickness on the ferromagnetism of LSMO and obtained improved magnetic properties with a maximum coercive field of 792 Oe in CFO/LSMO heterostructure for an optimum CFO thickness of ~ 40 nm. From the dynamic magnetic measurements using ferromagnetic resonance spectroscopy, we have obtained a low Gilbert damping parameter of ~ 0.037 for the LSMO/LAO structure due to spin–orbit coupling. Besides, the small gyromagnetic ratio (0.002 GHz/Oe) of the same film is quite promising to design spin valve and magnetic tunneling-based devices.

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  • Understanding the Average Electron–Hole Pair-Creation Energy in Silicon and Germanium Based on Full-Band Monte Carlo Simulations

    IEEE Transaction on Nuclear Science

    The thermalization process of sub-10-eV charge carriers is examined with treating carrier transport with full-band Monte Carlo simulations. The average energy loss (3.69 eV in Si and 2.62 eV in Ge) required to create a thermalized electron-hole pair, obtained from the simulations, is very close to the experimentally measured radiation-ionization energies of Si and Ge irradiated with high-energy particles. These results suggest that only interactions that occur after the radiation-generated…

    The thermalization process of sub-10-eV charge carriers is examined with treating carrier transport with full-band Monte Carlo simulations. The average energy loss (3.69 eV in Si and 2.62 eV in Ge) required to create a thermalized electron-hole pair, obtained from the simulations, is very close to the experimentally measured radiation-ionization energies of Si and Ge irradiated with high-energy particles. These results suggest that only interactions that occur after the radiation-generated charge carriers decay to energies of ~10 eV or less determine the fundamental property of the radiation-ionization energies. In addition to an energy loss equal to the band gap energy via impact ionization, acoustic-phonon emission, which has been omitted in prior work, contributes 30% of the remaining carrier energy loss, while optical-phonon emission contributes the other 70%.

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  • Carbon nanofiber modified with osmium based redox polymer for glucose sensing

    Journal of Electrochemical Science and Engineering

    Electrochemical detection of glucose was performed on carbon nanofibers containing an osmium based redox polymer and using glucose oxidase enzyme. Redox polymer assembled on the nanofibers provided a more stable support that preserved enzyme activity and promoted the electrical communication to the glassy carbon electrode. The morphologies, structures, and electrochemical behavior of the redox polymer modified nanofibers were characterized by scanning electron microscope, energy dispersive…

    Electrochemical detection of glucose was performed on carbon nanofibers containing an osmium based redox polymer and using glucose oxidase enzyme. Redox polymer assembled on the nanofibers provided a more stable support that preserved enzyme activity and promoted the electrical communication to the glassy carbon electrode. The morphologies, structures, and electrochemical behavior of the redox polymer modified nanofibers were characterized by scanning electron microscope, energy dispersive spectrometer and voltammetry. The glucose oxidase showed excellent communication with redox polymer as observed with the increased activity toward glucose. Both cyclic voltammetry and amperometry showed a linear response with glucose concentration. The linear range for glucose determination was from 1 to 12 mM with a relatively high sensitivity of 0.20±0.01 μA mM−1 for glucose oxidase in carbon nanofibers and 0.10±0.01 μA mM−1 without carbon nanofibers. The apparent Michaelis–Menten constant (Km) for glucose oxidase with carbon nanofibers was 0.99 mM. On the other hand, the Km value for the glucose oxidase without the nanofibers was 4.90 mM.

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