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Articles 61 - 87 of 87
Full-Text Articles in Electromagnetics and Photonics
Refractory Plasmonics With Titanium Nitride: Broadband Metamaterial Absorber, W Li, U. Guler, N. Kinsey, G. Naik, A. Boltasseva, J. Guan, V Shalaev, A. Kildishev
Refractory Plasmonics With Titanium Nitride: Broadband Metamaterial Absorber, W Li, U. Guler, N. Kinsey, G. Naik, A. Boltasseva, J. Guan, V Shalaev, A. Kildishev
U. Guler
A high-temperature stable broadband plasmonic absorber is designed, fabricated, and optically characterized. A broadband absorber with an average high absorption of 95% and a total thickness of 240 nm is fabricated, using a refractory plasmonic material, titanium nitride. This absorber integrates both the plasmonic resonances and the dielectric-like loss. It opens a path for the interesting applications such as solar thermophotovoltaics and optical circuits.
Magnetic And Microwave Properties Of Cofe/Ptmn/Cofe Multilayer Films, C. Pettiford, A. Zeltser, S. Yoon, V. Harris, C. Vittoria, N. Sun
Magnetic And Microwave Properties Of Cofe/Ptmn/Cofe Multilayer Films, C. Pettiford, A. Zeltser, S. Yoon, V. Harris, C. Vittoria, N. Sun
Nian X. Sun
CoFe/PtMn/CoFe films were deposited on seed layers of Ru or NiFeCr with CoFe film compositions being either Co-10 at. %Fe or Co-16 at. %Fe. Eight periods of the CoFe/PtMn/CoFe trilayers were also prepared. The magnetic properties and ferromagnetic resonance (FMR) of these films were characterized with vibrating-sample magnetometer, and field-sweep FMR system at X band (∽9.5 GHz). The Ru-seeded CoFe/PtMn/CoFe sandwich films show excellent magnetic softness with a low hard axis coercivity of 2-4 Oe, an easy axis Mr/Ms of >98%, and a significantly enhanced in-plane anisotropy of 57-123 Oe when CoFe layer thickness is above 200 …
Tunable Fringe Magnetic Fields Induced By Converse Magnetoelectric Coupling In A Fega/Pmn-Pt Multiferroic Heterostructure, Trifon Fitchorov, Yajie Chen, Bolin Hu, Scott Gillette, Anton Geiler, Carmine Vittoria, Vincent Harris
Tunable Fringe Magnetic Fields Induced By Converse Magnetoelectric Coupling In A Fega/Pmn-Pt Multiferroic Heterostructure, Trifon Fitchorov, Yajie Chen, Bolin Hu, Scott Gillette, Anton Geiler, Carmine Vittoria, Vincent Harris
Vincent G. Harris
The fringe magnetic field, induced by magnetoelectric coupling in a bilayer Fe-Ga/Pb(Mg1/3Nb2/3)O3_PbTiO3 (PMN-PT) multifunctional composite, was investigated. The induced external field is characterized as having a butterfly hysteresis loop when tuned by an applied electric field. A tuning coefficient of the electrically induced fringe magnetic field is derived from the piezoelectric and magnetostrictive properties of the composite. A measured maximum tuning coefficient, 4.5 Oe/(kV cm−1), is found to agree well with theoretical prediction. This work establishes a foundation in the design of transducers based on the magnetoelectric effect.
Mems Resonant Magnetic Field Sensor Based On An Aln/Fegab Bilayer Nano-Plate Resonator, Yu Hui, Tianxiang Nan, Nian Sun, Matteo Rinaldi
Mems Resonant Magnetic Field Sensor Based On An Aln/Fegab Bilayer Nano-Plate Resonator, Yu Hui, Tianxiang Nan, Nian Sun, Matteo Rinaldi
Tianxiang Nan
This paper reports on the first demonstration of an ultra-miniaturized, high frequency (215 MHz) and high sensitivity MEMS resonant magnetic field sensor based on an AlN/FeGaB bilayer nano-plate resonator capable of detecting magnetic field at nano-Tesla level. Despite of the reduced volume and the high operating frequency of the sensor, high electromechanical performances were achieved (quality factor Q ≈ 511 and electromechanical coupling coefficient kt² ≈ 1.63%). This first prototype was characterized for different magnetic field levels from 0 to 152 Oe showing a frequency sensitivity of ~ 1 Hz/nT and a limit of detection of ~ 10 nT.
Mems Resonant Magnetic Field Sensor Based On An Aln/Fegab Bilayer Nano-Plate Resonator, Yu Hui, Tianxiang Nan, Nian Sun, Matteo Rinaldi
Mems Resonant Magnetic Field Sensor Based On An Aln/Fegab Bilayer Nano-Plate Resonator, Yu Hui, Tianxiang Nan, Nian Sun, Matteo Rinaldi
Matteo Rinaldi
This paper reports on the first demonstration of an ultra-miniaturized, high frequency (215 MHz) and high sensitivity MEMS resonant magnetic field sensor based on an AlN/FeGaB bilayer nano-plate resonator capable of detecting magnetic field at nano-Tesla level. Despite of the reduced volume and the high operating frequency of the sensor, high electromechanical performances were achieved (quality factor Q ≈ 511 and electromechanical coupling coefficient kt² ≈ 1.63%). This first prototype was characterized for different magnetic field levels from 0 to 152 Oe showing a frequency sensitivity of ~ 1 Hz/nT and a limit of detection of ~ 10 nT.
Large Coercivity In Nanostructured Rare-Earth-Free Mnₓga Films, Don Heiman, Tom Nummy, Steve Bennett, Tom Cardinal
Large Coercivity In Nanostructured Rare-Earth-Free Mnₓga Films, Don Heiman, Tom Nummy, Steve Bennett, Tom Cardinal
Donald Heiman
The magnetic hysteresis of MnₓGa films exhibit remarkably large coercive fields as high as μₒHC=2.5 T when fabricated with nanoscale particles of a suitable size and orientation. This coercivity is an order of magnitude larger than in well-ordered epitaxial film counterparts and bulk materials. The enhanced coercivity is attributed to the combination of large magnetocrystalline anisotropy and ~50-100 nm size nanoparticles. The large coercivity is also replicated in the electrical properties through the anomalous Hall effect. The magnitude of the coercivity approaches that found in rare-earth magnets, making them attractive for rare-earth-free magnet applications.
Single-Event Charge Enhancement In Soi Devices, David Kerns, Sherra Kerns, L Massengill, M Alles
Single-Event Charge Enhancement In Soi Devices, David Kerns, Sherra Kerns, L Massengill, M Alles
Sherra E. Kerns
Studies are presented of single-particle ion effects in body-tied CMOS/silicon-on-insulator (SOI) devices. It is shown that two mechanisms can contribute to SOI soft-error rates: a direct ion-induced photocurrent and a local lateral bipolar current. The total amount of charge collected is sensitive to the relative locations of the ion strike and the body-to-source tie.
Single-Event Charge Enhancement In Soi Devices, David Kerns, Sherra Kerns, L Massengill, M Alles
Single-Event Charge Enhancement In Soi Devices, David Kerns, Sherra Kerns, L Massengill, M Alles
David V. Kerns
Studies are presented of single-particle ion effects in body-tied CMOS/silicon-on-insulator (SOI) devices. It is shown that two mechanisms can contribute to SOI soft-error rates: a direct ion-induced photocurrent and a local lateral bipolar current. The total amount of charge collected is sensitive to the relative locations of the ion strike and the body-to-source tie.
Possible Low-Loss Faraday-Rotation And Phase-Shifts Using Multilayer Ferrite Structures, J. Sokoloff, C. Vittoria
Possible Low-Loss Faraday-Rotation And Phase-Shifts Using Multilayer Ferrite Structures, J. Sokoloff, C. Vittoria
Jeffrey Sokoloff
It is suggested that it should be possible to make low insertion loss devices (e.g., Faraday rotators, phase shifters, and broad-band filters) to operate in the millimeter wave range using a multilayer array of thin films magnetized perpendicular to the films with waves of frequency below the magnon continuum normally incident.
Frequency-Dependence Of The Ferromagnetic-Resonance Linewidth Of Barium Ferrite, M. Elrayess, J. Sokoloff, C. Vittoria, W. Spurgeon
Frequency-Dependence Of The Ferromagnetic-Resonance Linewidth Of Barium Ferrite, M. Elrayess, J. Sokoloff, C. Vittoria, W. Spurgeon
Jeffrey Sokoloff
Ferromagnetic resonance was measured in both a swept frequency mode of operation, in which the magnetic field was fixed, and a field swept mode, using field modulation techniques. Single-crystal spheres of 0.381, 0.305, and 0.483 mm in diameter were inserted in the waveguide and transmission was observed in the measurement. The g values for all the spheres averaged to 2.052 ± 0.011 and the uniaxial anisotropy field was 16.4 kOe. Our measurements show that the linewidth of barium ferrite is nearly independent of resonant frequency from 48 to 105 G Hz. This is in disagreement with the Kasuya-LeCraw two-magnon-one-phonon mechanism, …
Intrinsic Ferromagnetic Resonance Linewidth Of Barium Ferrite Due To Spin-Wave Scattering By Trigonal Site Single-Particle Excitations, J. Sokoloff, S. Marshall, C. Vittoria
Intrinsic Ferromagnetic Resonance Linewidth Of Barium Ferrite Due To Spin-Wave Scattering By Trigonal Site Single-Particle Excitations, J. Sokoloff, S. Marshall, C. Vittoria
Jeffrey Sokoloff
Time-dependent two-magnon scattering was previously proposed as a mechanism to explain the large magnitude of the ferrimagnetic resonance (FMR) linewidth of barium ferrite as a function of frequency. In the present work, it is shown that a quantum mechanical mechanism like the Kasuya-Le Craw process (KL) but with the phonon excitation replaced by a single-particle excitation of a trigonal site iron ion, which moves in an anharmonic potential well, gives a linewidth contribution of less than a tenth of an Oersted and proportional to the frequency, as in the KL mechanism. We conclude, based on this work and our previous …
Ferrimagnetic Resonance Lineshape Asymmetry Due To Suhl Instabilities, P. Dorsey, J. Sokoloff, C. Vittoria
Ferrimagnetic Resonance Lineshape Asymmetry Due To Suhl Instabilities, P. Dorsey, J. Sokoloff, C. Vittoria
Jeffrey Sokoloff
We present calculations of the ferrimagnetic resonance lineshapes resulting from second order Suhl instabilities for thin films and spheres. We find that whereas a spherical sample has a lineshape which is symmetrical around the resonant frequency, a thin film has an asymmetrical lineshape. The calculations are in agreement with measurements that we have performed of the lineshape as a function of input power for thin film samples of both barium ferrite and yttrium iron garnet. When the magnetic field direction is changed from perpendicular to parallel to the film plane, the asymmetry of the lineshape at magnetic resonance changes in …
Room Temperature Magnetism In Semiconducting Films Of Zno Doped With Ferric Ions, S. Yoon, Y. Chen, D. Heiman, A. Yang, N. Sun, C. Vittoria, V. Harris
Room Temperature Magnetism In Semiconducting Films Of Zno Doped With Ferric Ions, S. Yoon, Y. Chen, D. Heiman, A. Yang, N. Sun, C. Vittoria, V. Harris
Donald Heiman
Films consisting of Zn₁₋ₓFeₓO were prepared by alternating-target laser ablation deposition. The Fe doping levels ranged from x=0.016 to 0.125 at. %. X-ray diffraction and energy dispersive x-ray spectroscopy measurements showed only (002n) reflections of the ZnO host and confirmation of the Fe concentration, respectively. For films grown on (001) Al₂O₃ at 300 K, room temperature average saturation magnetization, < 4πMs >, measured from superconducting quantum interference device (SQUID) hysteresis loops for x=0.125 ± 0.025 was 172 G. Although SQUID measurements were sensitive to the average value of the saturation magnetization, ferrimagnetic resonance measurements appeared to be sensitive only to the saturation …
Structural And Magnetic Properties Of Ball-Milled Ni₁₁Co₁₁Fe₆₆Zr₇B₄Cu Powders, Ashish Baraskar, Yajie Chen, Soack Yoon, C. Chinnasamy, Nian Sun, Carmine Vittoria, Vincent Harris, Todd Heil, Matthew Willard
Structural And Magnetic Properties Of Ball-Milled Ni₁₁Co₁₁Fe₆₆Zr₇B₄Cu Powders, Ashish Baraskar, Yajie Chen, Soack Yoon, C. Chinnasamy, Nian Sun, Carmine Vittoria, Vincent Harris, Todd Heil, Matthew Willard
Nian X. Sun
Thick films of the Ni₁₁Co₁₁Fe₆₆Zr₇B₄Cu composition were synthesized via screen printing of the ball-milled ribbons of the above composition for possible use as planar inductors. The ribbons were obtained by rapid solidification. The resulting ribbon samples were annealed at 300 degrees C for 2 h to cause embrittlement. They were found to have soft magnetic properties (4πMs∽13 kG,ΔH ∽100 Oe, and Hc< 0.5 Oe). The brittle ribbons were ball milled using tungsten carbide vials and stainless steel balls in an inert atmosphere for various milling times. The sample milled for 10 h was found to have a 4πMs of about …
High-Sensitivity Ferromagnetic Resonance Measurements On Micrometer-Sized Samples, S. Zhang, S. Oliver, N. Israeloff, C. Vittoria
High-Sensitivity Ferromagnetic Resonance Measurements On Micrometer-Sized Samples, S. Zhang, S. Oliver, N. Israeloff, C. Vittoria
Nathan Israeloff
Ferromagnetic resonance measurements were taken on a 4 μm diam disk using a planar microwave transmission line device. The absorption modes of a sample placed on this devise can be measured by monitoring the microwave power transmitted across the device while a swept magnetic field varies the sample absorption through resonance. Results for the disk, which was etched from a 105 nm thick amorphous Fe₈₀B₁₅Si₅ film, followed the Kittel model over the frequency range from 2 to 20 GHz, in agreement with parameters measured on 5 mm diam disks by a microwave cavity. These results indicate the device has a …
Microwave Magnetoelectric Coupling And Ferromagnetic Resonance Frequency Tuning Of A Co₂Mnsb/Gaas/Pzn-Pt Heterostructure, Yajie Chen, Aria Yang, Moti Paudel, Shane Stadler, C. Vittoria, V. Harris
Microwave Magnetoelectric Coupling And Ferromagnetic Resonance Frequency Tuning Of A Co₂Mnsb/Gaas/Pzn-Pt Heterostructure, Yajie Chen, Aria Yang, Moti Paudel, Shane Stadler, C. Vittoria, V. Harris
Vincent G. Harris
A systematic study of electric-field-tuned ferromagnetic resonance (FMR) of a ferroelectric/ferromagnetic/semiconductor multiferroic heterostructure, consisting of a Co₂MnSb epitaxial film grown on a GaAs substrate bonded to a lead zinc niobate-lead titanate crystal, is reported. The films, grown by pulsed laser deposition, were studied for their crystallographic structure, magnetocrystalline anisotropy, and magnetostrictive and ferromagnetic resonance properties. Ferromagnetic resonance measurements were carried out at X-band frequency under the application of electric fields with external magnetic fields applied along the [110], [100], [1Ī0] and [001] directions of the Heusler film. Magnetic anisotropy fields were derived from the angular dependence of FMR measurements, yielding …
Large Tunability Of Néel Temperature By Growth-Rate-Induced Cation Inversion In Mn-Ferrite Nanoparticles, Aria Yang, C. Chinnasamy, J. Greneche, Yajie Chen, Soack Yoon, Kailin Hsu, C. Vittoria, V. Harris
Large Tunability Of Néel Temperature By Growth-Rate-Induced Cation Inversion In Mn-Ferrite Nanoparticles, Aria Yang, C. Chinnasamy, J. Greneche, Yajie Chen, Soack Yoon, Kailin Hsu, C. Vittoria, V. Harris
Vincent G. Harris
The tuning of Néel temperature by greater than 100 K in nanoparticle Mn-ferrite was demonstrated by a growth-rate-induced cation inversion. Mn-ferrite nanoparticles, having diameters from 4 to 50 nm, were synthesized via coprecipitation synthesis. The Neel temperature (TN) increased inversely to the cation inversion parameter,δ (i.e., defined as (Mn1-δFeδ)tet[MnδFe2-δ]octO₄). Concomitantly, TN increased with increased particle growth rate and particle size. These results unambiguously establish cation inversion as the dominant mechanism in modifying the superexchange leading to enhanced TN. The ability to tailor TN enables greater flexibility in applying nanoparticle ferrites in emerging technologies.
Large-Scale Chemical Synthesis Of Shape And Size Controlled Bafe₁₂₋ₓscₓo₁₉ Platelets For In-Plane Oriented Thick Screen Printed Films, T. Sakai, C. Chinnasamy, S. Yoon, A. Geiler, C. Vittoria, V. Harris
Large-Scale Chemical Synthesis Of Shape And Size Controlled Bafe₁₂₋ₓscₓo₁₉ Platelets For In-Plane Oriented Thick Screen Printed Films, T. Sakai, C. Chinnasamy, S. Yoon, A. Geiler, C. Vittoria, V. Harris
Vincent G. Harris
Scandium (Sc) doped, single phase BaFe₁₂₋ₓScₓO₁₉ (x=0.3 and 0.8) were prepared at large scale (10 g) by a modified chemical coprecipitation technique. The scanning electron micrograph analysis shows the formation of nearly uniform hexagonal platelets with an average size of < 1 μm. The sizes of the platelets were controlled by sintering temperature. The screen printed, in-plane oriented films were annealed at different temperatures to produce a dense and thick ferrite film. The hysteresis loops for x=0.3 show a squareness ratio of 0.9 and the saturation magnetic moment of 3700 G and the coercivity of 250 Oe. The saturation magnetic moment …
Numerical Simulation Of Wave Propagation In Y- And Z-Type Hexaferrites For High Frequency Applications, J. Wang, A. Geiler, V. Harris, C. Vittoria
Numerical Simulation Of Wave Propagation In Y- And Z-Type Hexaferrites For High Frequency Applications, J. Wang, A. Geiler, V. Harris, C. Vittoria
Vincent G. Harris
The dispersion characteristics of microstrip lines on magnetically anisotropic substrates are studied utilizing the Galerkin's method in the spectral domain. Specifically, we calculate the differential phase shifts of devices consisting of Z-type (Zn₂Z) and Y-type (Zn₂Y) ferrites as a function of applied magnetic field. Our theoretical formulism is effective in modeling highly magnetically anisotropic materials, which are becoming increasingly important for the next generation of microwave devices. Such a theoretical treatment of anisotropic ferrite magnetic materials is presently unavailable in commercial numerical simulation tools.
Low-Loss Barium Ferrite Quasi-Single-Crystals For Microwave Application, Yajie Chen, Anton Geiler, Taiyang Chen, Tomokazu Sakai, C. Vittoria, V. Harris
Low-Loss Barium Ferrite Quasi-Single-Crystals For Microwave Application, Yajie Chen, Anton Geiler, Taiyang Chen, Tomokazu Sakai, C. Vittoria, V. Harris
Vincent G. Harris
Barium hexaferrites (BaFe₁₂O₁₉) are especially useful for microwave/millimeter devices. Due to large ferromagnetic resonance (FMR) loss (linewidths > 2 kOe), traditional compacts of polycrystalline Ba ferrites indeed hinder the utilization of the materials for practical devices. The present experiment demonstrates that the quasi-single-crystal Ba ferrite disks can be fabricated by a single solid-state reaction technique without liquid phase participation, combining with a processing of alignment for the ferrite seed crystals. The ferrite bulks show a pure hexagonal Ba ferrite phase, an expected 4πMs of 4.48 kG, and coercivity of 10∽20 Oe along the c axis, similar to the results of a …
A Microstrip Tunable Negative Refractive Index Metamaterial And Phase Shifter, P. He, J. Gao, C. Marinis, P. Parimi, C. Vittoria, V. Harris
A Microstrip Tunable Negative Refractive Index Metamaterial And Phase Shifter, P. He, J. Gao, C. Marinis, P. Parimi, C. Vittoria, V. Harris
Vincent G. Harris
A tunable negative refractive index metamaterial and miniature phase shifter have been designed and fabricated in a microstrip configuration for applications in radio frequency integrated circuits. The metamaterial consists of plasmonic copper wires and yttrium iron garnet slabs having a low insertion loss of 5 dB at the center of the transmission band. The yttrium iron garnet material enables the magnetic field tuning of the negative refractive index in a dynamic frequency band from 7.0 to 11.0 GHz. The insertion phase can be tuned by 45 degrees continuously by varying the bias field from 3.8 to 4.6 kOe at 9.0 …
Functionalization Of Feco Alloy Nanoparticles With Highly Dielectric Amorphous Oxide Coatings, Q. Nguyen, C. Chinnasamy, S. Yoon, S. Sivasubramanian, T. Sakai, A. Baraskar, S. Mukerjee, C. Vittoria, V. Harris
Functionalization Of Feco Alloy Nanoparticles With Highly Dielectric Amorphous Oxide Coatings, Q. Nguyen, C. Chinnasamy, S. Yoon, S. Sivasubramanian, T. Sakai, A. Baraskar, S. Mukerjee, C. Vittoria, V. Harris
Vincent G. Harris
FeCo alloy nanoparticles have been prepared by using a two step modified polyol process using Fe(II) chloride and Co acetate tetrahydrate as Fe and Co metal precursors. Tetraethyl silicate, aluminum isopropoxide, and zirconium(IV) acetyl acetonate were used to make amorphous SiO₂, Al₂O₃, and ZrO₂ coatings, respectively. X-ray diffraction studies showed that there are no crystalline peaks corresponding SiO₂, Al₂O₃, and ZrO₂ because the oxide coatings of the FeCo core are amorphous in nature. The scanning electron micrograph analysis depicted the cubic nature of the particles with mean particle size of about 45 nm. The maximum saturation magnetization of 205 emu/g …
Direct Chemical Synthesis Of High Coercivity Air-Stable Smco Nanoblades, C. Chinnasamy, J. Huang, L. Lewis, B. Latha, C. Vittoria, V. Harris
Direct Chemical Synthesis Of High Coercivity Air-Stable Smco Nanoblades, C. Chinnasamy, J. Huang, L. Lewis, B. Latha, C. Vittoria, V. Harris
Vincent G. Harris
Ferromagnetic air-stable SmCo nanoparticles have been produced directly using a one-step chemical synthesis method. X-ray diffraction studies confirmed the formation of hexagonal SmCo5 as a dominant phase. High resolution transmission electron microscopy confirms the presence of uniform, anisotropic bladelike nanoparticles approximately 10 nm in width and 100 nm in length. Values of the intrinsic coercivity and the magnetization in the as-synthesized particles are 6.1 kOe and 40 emu/g at room temperature and 8.5 kOe and 44 emu/g at 10 K, respectively. This direct synthesis process is environmentally friendly and is readily scalable to large volume synthesis to meet the needs …
Scalar Potential Concept For Calculating The Steady Magnetic Fields And Eddy Currents, Kamo Demirchian, Vladimir Chechurin, Mulukutla Sarma
Scalar Potential Concept For Calculating The Steady Magnetic Fields And Eddy Currents, Kamo Demirchian, Vladimir Chechurin, Mulukutla Sarma
Sarma Mulukutla
The concept of scalar potential has been used for magnetic field calculation in the USSR during the last decade. It is based on treating the eddy component of the magnetic field separately and calculating the potential field with the help of the scalar potential by introducing imaginary magnetic charges. This method has been developed for digital calculations of magnetic fields in various electromagnetic devices, by solving linear and nonlinear partial-differential equations through mathematical simulation. This paper presents the mathematical formulation of the method. It is advantageous to use the scalar potential method for two-dimensional eddy-current calculations because of the possibility …
The Effect Of Curvature Rate On The Received Power In Parabolic Reflector, Amean Al_Safi
The Effect Of Curvature Rate On The Received Power In Parabolic Reflector, Amean Al_Safi
Amean S Al_Safi
In this paper we study the effect of curvature rate on the generated electric field at the focus point if the frequency and diameter are constants .We assume that the incident electromagnetic waves distributed uniformly on each point of the reflector surface ;hence we can imagine that this reflector has uniform surface charge ,and this body will generate an electric field on all points in front of it (including the focus point) . This field can be obtained by using coulomb’s law .The derived expression for electric field show that X and Y components will vanish and the electric field …
Nano-Structured Optical Thin Films And Their Applications, Andrew Sarangan
Nano-Structured Optical Thin Films And Their Applications, Andrew Sarangan
Andrew Sarangan
No abstract provided.
Nano-Structured Materials For Imaging Polarimetry, Andrew Sarangan
Nano-Structured Materials For Imaging Polarimetry, Andrew Sarangan
Andrew Sarangan
No abstract provided.