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  • AIP Publishing  (267)
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  • AIP Publishing  (267)
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  • 1
    Online Resource
    Online Resource
    Oscillations of interlayer coupling and magneto-optics in sputtered Co–Al/Cu multilayers
    AIP Publishing ; 1996
    In:  Applied Physics Letters Vol. 69, No. 1 ( 1996-07-01), p. 127-129
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 69, No. 1 ( 1996-07-01), p. 127-129
    Abstract: We have prepared [Co90Al10/Cu]30 multilayers by ion beam sputtering and studied the behavior of interlayer coupling, magnetoresistance, and the magneto-optical Kerr effect. For Co–Al/Cu multilayers, the in-plane saturation field, coercive force HC and magnetoresistance ratio ΔR/R have been observed to oscillate with a period of about 0.9 nm, as a function of Cu spacer layer thickness. Furthermore, polar Kerr rotation θk in visible wavelength range also oscillates with the same period. The magneto-optical activities may be attributed to changes in the optical constants with the magnetic state.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.118097
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Investigation of high hole mobility In0.41Ga0.59Sb/Al0.91Ga0.09Sb quantum well structures grown by molecular beam epitaxy
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 104, No. 5 ( 2014-02-03)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 104, No. 5 ( 2014-02-03)
    Abstract: Modulation-doped In0.41Ga0.59Sb/Al0.91Ga0.09Sb quantum-well (QW) structures were grown by molecular beam epitaxy. Cross-sectional transmission electron microscopy and atomic force microscopy studies show high crystalline quality and smooth surface morphology. X-ray diffraction investigations confirm 1.94% compressive strain within In0.41Ga0.59Sb channel. High room temperature hole mobility with high sheet density of 1000 cm2/Vs, 0.877 × 1012/cm2, and 965 cm2/Vs, 1.112 × 1012/cm2 were obtained with different doping concentrations. Temperature dependent Hall measurements show different scattering mechanisms on hole mobility at different temperature range. The sheet hole density keeps almost constantly from 300 K to 77 K. This study shows great potential of In0.41Ga0.59Sb/Al0.91Ga0.09Sb QW for high-hole-mobility device applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4865091
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Molecular beam epitaxy growth of high electron mobility InAs/AlSb deep quantum well structure
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 114, No. 1 ( 2013-07-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 114, No. 1 ( 2013-07-07)
    Abstract: InAs/AlSb deep quantum well (QW) structures with high electron mobility were grown by molecular beam epitaxy (MBE) on semi-insulating GaAs substrates. AlSb and Al0.75Ga0.25Sb buffer layers were grown to accommodate the lattice mismatch (7%) between the InAs/AlSb QW active region and GaAs substrate. Transmission electron microscopy shows abrupt interface and atomic force microscopy measurements display smooth surface morphology. Growth conditions of AlSb and Al0.75Ga0.25Sb buffer were optimized. Al0.75Ga0.25Sb is better than AlSb as a buffer layer as indicated. The sample with optimal Al0.75Ga0.25Sb buffer layer shows a smooth surface morphology with root-mean-square roughness of 6.67 Å. The electron mobility has reached as high as 27 000 cm2/Vs with a sheet density of 4.54 × 1011/cm2 at room temperature.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4811443
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Thermoelectric transport properties in atomic scale conductors
    AIP Publishing ; 2004
    In:  The Journal of Chemical Physics Vol. 121, No. 17 ( 2004-11-01), p. 8537-8541
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 121, No. 17 ( 2004-11-01), p. 8537-8541
    Abstract: The thermoelectric transport properties in atomic scale conductors consisting of a Si atom connected by two electrodes are investigated. It is found that both the electrical current and the heat current have two contributions, one from the voltage and the other from the temperature gradient. The quantities such as the Seebeck thermopower and the thermal conductance that characterize the thermoelectric transport properties of the tunnel atomic junction are studied quantitatively with a first-principles technique within the framework of Landauer–Büttiker formalism in the linear response regime. A finite thermopower only exists in a very narrow range where the energy derivative of the transmission function is nonzero. The thermopower anomaly is observed in the tunneling regime in this device but this does not violate the thermodynamic law with respect to the heat current.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1803544
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    Study of the Kerr effect of CoxAg100−x granular films
    AIP Publishing ; 1999
    In:  Journal of Applied Physics Vol. 85, No. 8 ( 1999-04-15), p. 5121-5123
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 85, No. 8 ( 1999-04-15), p. 5121-5123
    Abstract: A series of CoxAg100−x granular films was annealed at 100, 250, 400, and 500 °C, respectively. Both the dielectric function and polar Kerr effect were measured using a spectroscopic ellipsometer and a magneto-optical Kerr spectrometer in the 1.5–4.5 eV photon energy range. It was found that the Kerr effect was greatly enhanced with increasing annealing temperature, especially for those samples having low Co compositions. After annealing, the strong resonance peaks appear in the 3.7–4.1 eV range. For the typical sample with x=6, the maximum Kerr rotation angle is about 0.26° near 4.0 eV after annealing at 500 °C. Through data analysis, the large negative peak at about 3.85 eV is attributed to the plasma edge of Ag, and the positive peak near 4.0 eV is attributed to the new magneto-optical structure and the properties of the granular film. The larger short-wavelength Kerr effect will be useful for increasing magneto-optical data-storage density.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.369097
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    A joint experimental and theoretical study on structural, electronic, and magnetic properties of MnGen− (n = 3–14) clusters
    AIP Publishing ; 2021
    In:  The Journal of Chemical Physics Vol. 154, No. 20 ( 2021-05-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 154, No. 20 ( 2021-05-28)
    Abstract: A systematic structure and property investigation of MnGen− (n = 3–14) was conducted by means of density functional theory coupled with mass-selected anion photoelectron spectroscopy. This combined theoretical and experimental study allows global minimum and coexistence structures to be identified. It is found that the pentagonal bipyramid shape is the basic framework for the nascent growth process of MnGen− (n = 3–10), and from n = 10, the endohedral structures can be found. For n = 12, the anion MnGe12− cluster probably includes two isomers: a major isomer with a puckered hexagonal prism geometry and a minor isomer with a distorted icosahedron geometry. Specifically, the puckered hexagonal prism isomer follows the Wade–Mingos rules and can be suggested as a new kind of superatom with the magnetic property. Furthermore, the results of adaptive natural density partitioning and deformation density analyses suggest a polar covalent interaction between Ge and Mn for endohedral clusters of MnGe12−. The spin density and natural population analysis indicate that MnGen− clusters have high magnetic moments localized on Mn. The density of states diagram visually shows the significant spin polarization for endohedral structures and reveals the weak interaction between the Ge 4p orbital and the 4s, 3d orbitals of Mn.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0053414
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Enhanced H-filter based on Fåhræus-Lindqvist effect for efficient and robust dialysis without membrane
    AIP Publishing ; 2015
    In:  Biomicrofluidics Vol. 9, No. 4 ( 2015-07-01)
    Details
    In: Biomicrofluidics, AIP Publishing, Vol. 9, No. 4 ( 2015-07-01)
    Abstract: A novel microfluidic device for highly efficient and robust dialysis without membrane is highly desired for the development of portable or wearable microdialyzer. Here we report an enhanced H-filter with pillar array based on Fåhræus-Lindqvist effect (F-L effect) for highly efficient and robust membraneless dialysis of simplified blood for the first time. The H-filter employs two fluids laminarly flowing in the microchannel for continuously membraneless dialysis. With pillar array in the microchannel, the two laminar flows, with one containing blood cells and small molecules and another containing dialyzate solution, can form a cell-free layer at the interface as selective zones for separation. This provides enhanced mixing yet extremely low shear for extraction of small molecules from the blood-cell-containing flow into the dialyzate flow, resulting in robust separation with reduced cell loss and improved efficiency. We demonstrate this by first using Chlorella pyrenoidosa as model cells to quantitatively study the separation performances, and then using simplified human blood for dialysis. The advanced H-filter, with highly efficient and robust performance for membraneless dialysis, shows great potential as promising candidate for rapid blood analysis/separation, and as fundamental structure for portable dialyzer.
    Type of Medium: Online Resource
    ISSN: 1932-1058
    URL: Article
    DOI: 10.1063/1.4927574
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 2265444-6
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  • 8
    Online Resource
    Online Resource
    Structures of (NaSCN)2(H2O)n−/0 (n = 0–7) and solvation induced ion pair separation: Gas phase anion photoelectron spectroscopy and theoretical calculations
    AIP Publishing ; 2021
    In:  The Journal of Chemical Physics Vol. 154, No. 20 ( 2021-05-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 154, No. 20 ( 2021-05-28)
    Abstract: We studied (NaSCN)2(H2O)n− clusters in the gas phase using size-selected anion photoelectron spectroscopy. The photoelectron spectra and vertical detachment energies of (NaSCN)2(H2O)n− (n = 0–5) were obtained in the experiment. The structures of (NaSCN)2(H2O)n−/0 up to n = 7 were investigated with density functional theory calculations. Two series of peaks are observed in the spectra, indicating that two types of structures coexist, the high electron binding energy peaks correspond to the chain style structures, and the low electron binding energy peaks correspond to the Na–N–Na–N rhombic structures or their derivatives. For the (NaSCN)2(H2O)n− clusters at n = 3–5, the Na–N–Na–N rhombic structures are the dominant structures, the rhombic four-membered rings start to open at n = 4, and the solvent separated ion pair (SSIP) type of structures start to appear at n = 6. For the neutral (NaSCN)2(H2O)n clusters, the Na–N–Na–N rhombic isomers become the dominant starting at n = 3, and the SSIP type of structures start to appear at n = 5 and become dominant at n = 6. The structural evolution of (NaSCN)2(H2O)n−/0 (n = 0–7) confirms the possible existence of ionic clusters such as Na(SCN)2− and Na2(SCN)+ in NaSCN aqueous solutions.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0049567
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 9
    Online Resource
    Online Resource
    Molecular dynamics simulation on the thermodynamic properties of insulating paper cellulose modified by silane coupling agent grafted nano-SiO 2
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 12 ( 2019-12-01), p. 125134-
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 12 ( 2019-12-01), p. 125134-
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5131821
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
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  • 10
    Online Resource
    Online Resource
    A turbulent crosswind simulation method at high-speed railway tunnel entrance: Based on field test and geometric turbulence generator
    AIP Publishing ; 2023
    In:  Physics of Fluids Vol. 35, No. 1 ( 2023-01-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 35, No. 1 ( 2023-01-01)
    Abstract: It is common for high-speed trains (HSTs) to abruptly switch between a tunnel and a flat ground along high-speed rail lines. When encountering strong crosswinds, the safety of HSTs in such running scenarios will be severely threatened. The simulation of the turbulent component of an incoming crosswind is very important to restore the real aerodynamic environment of HSTs in tunnel-flat ground-tunnel (TFT) running scenario. The purpose of the present study is to determine which of the two geometric turbulence generators, the spire and the fence, is more suitable for computational fluid dynamics (CFD) simulation of a fluctuating crosswind field in the TFT scene. First, the wind field characteristics in the TFT scene are analyzed based on the field test. Then, the tunnel-flat ground-spire/fence CFD model was established based on the “mosaic” mesh technology. Finally, the difference of wind field fluctuating characteristics under two turbulence generator conditions based on improved delayed detached eddy simulation (IDDES) is discussed. The main results show that the average wind speed of the windward and leeward lines in the fence case are 60% and 43.75% higher than the corresponding values in the spire case, respectively. The main conclusions show that the turbulent crosswind generated by the spire is more consistent with the spectrum characteristics of the natural wind field.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0133292
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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