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  • 1
    Electronic Resource
    Electronic Resource
    A new design for a UHV compatible Czochralski crystal growth system (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2427-2429 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the design of a new system for the Czochralski growth of single crystals of intermetallic materials under ultrahigh vacuum conditions. Particular attention has been paid to an arrangement for very uniform movement of the pulling mechanism. We report the growth of large high-quality single crystals of MnSi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141333
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance scattering across interfaces via the dipolar demagnetizing field (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 295-301 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dipolar demagnetizing field in nuclear magnetic resonance of liquids is a convenient means of measuring the scattering function corresponding to a two-species spatial correlation function. In particular, the method applies where the distance to be measured is long compared to the diffusion length. Here we explore theoretically and experimentally the dipolar demagnetizing field scattering in the oil phase of a polydisperse oil/water emulsion. The initial spin grating is created in one phase, and the scattering from the other phase is observed. The experimental results confirm that structural properties of the system, including the average bubble size distribution, can be probed using the dipolar field. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1423947
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  • 3
    Electronic Resource
    Electronic Resource
    Design of a cone-penetrometer-compatible probe and housing: The LLNL Raman probe (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3735-3743 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An integrated infinity-focused fiber optic probe designed for cone penetrometer and hand-held use and constructed at Lawrence Livermore National Laboratories is described and evaluated for performance. Throughput efficiency is calculated, distance dependence, background levels, and sensitivity to heterogeneity in samples is evaluated. Representative spectra are presented that make use of the major performance advantages of this probe, which are (a) background rejection, (b) low sample light fluences, (c) distant viewing, (d) sample penetration, and (e) sample averaging capability. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149985
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of the focused output from a selenium soft x-ray laser (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 786-788 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The output energy (90 μJ), focal spot diameter (235 μm), and pointing accuracy (±75 μrad) for a 3.7-cm-long Se soft x-ray laser operating at 20.6 and 20.9 nm are reported. Now that this intense soft x-ray source has been well characterized it may find use in such diverse applications as lithography, contact microscopy, holography, and photoionization pumping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101359
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal and optical characterization of the calcium phosphate biomaterial hydroxyapatite (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6848-6852 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermal wave interferometry (TWI) has been used to measure the thermophysical properties of hydroxyapatite (HA) coatings, prepared by the plasma-spraying process on titanium alloy substrates. The properties measured were thermal diffusivity, thermal conductivity, thermal effusivity, and volumetric heat capacity and the optical absorption coefficient. The thermal conductivity obtained was found to be of similar magnitude to that of human tooth enamel. The results presented confirm the usefulness of TWI as a nondestructive technique for the characterization of plasma-sprayed HA coatings. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362650
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  • 6
    Electronic Resource
    Electronic Resource
    Observation of near-band-gap luminescence from boron nitride films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1251-1253 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report results from cathodoluminescence spectroscopy of boron nitride films grown on Si(100) substrates by ion-source-assisted magnetron sputtering of a hexagonal BN target. Three main peaks are observed in the near-band-gap region for hexagonal boron nitride films at energies of 4.90, 5.31, and 5.50 eV. We also report deep-level emission spectra of predominantly cubic boron nitride films which are correlated with sample growth conditions. In particular we show that the emission intensity, position, and linewidth are strongly dependent on the substrate bias voltage used during sample growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112086
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  • 7
    Electronic Resource
    Electronic Resource
    Time dependence and mechanisms of magnetization reversal in Tb–Fe–Co films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2594-2600 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements have been made of the time dependence of magnetization, under constant applied field conditions, of thin films of Tb–Fe–Co alloy. The results have been analyzed using a model in which it is assumed that magnetization proceeds by thermal activation of irreversible switching of the magnetic moments of identical elementary volumes. It is assumed that the activation energy for switching, intrinsically the same for all elementary volumes, varies according to local interactions. Values of the fluctuation field Λ are derived and it is found that for the films examined, Λ is independent of magnetization M and the applied field. It is shown that information about the magnetic interactions between the elementary volumes, due to exchange and demagnetizing fields, may be derived from graphs of dM/dt vs M. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361128
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  • 8
    Electronic Resource
    Electronic Resource
    Site symmetry analysis of the 738 nm defect in diamond (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4069-4075 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on a detailed analysis of polarized Raman and luminescence measurements of a "mosaic'' diamond film, symmetry properties of a ubiquitous point defect observed in diamond films are determined. Specifically, the defect, which gives rise to emission at 738 nm, is determined unequivocally to be a 〈110〉-oriented defect with the transition dipole moment of the center oriented along the 〈110〉 symmetry axis. These results represent the first analysis of the symmetry properties of this point defect and aid in the development of structural model of the center. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359864
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  • 9
    Electronic Resource
    Electronic Resource
    Photoluminescence investigation of GaN films grown by metalorganic chemical vapor deposition on (100) GaAs (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 1705-1709 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaN films were grown on (100) GaAs substrates by metalorganic chemical vapor deposition and were found to be of (200) cubic or (111) cubic/(0002) hexagonal phase. Their photoluminescence characteristics remained invariant with material phase. We report assignment of band-edge photoluminescence near 3.36 eV and 3.15–3.31 eV in apparently cubic GaN to intrinsic/bound excitons and phonon-assisted, donor-acceptor pair recombination respectively, on the basis of observed temperature and intensity dependences. A free exciton energy of 3.375 eV is deduced at 6.5 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358862
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic viscosity, fluctuation fields, and activation energies (invited) : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6386-6390 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time dependence of magnetization in ferromagnetic materials was first described towards the end of the 19th century. Subsequently, two types of mechanisms responsible for time dependent behavior were identified and became known as "diffusion'' and "fluctuation'' after-effect or viscosity. The former depends on thermally induced motion of impurity atoms. The latter is a consequence of thermal activation of irreversible domain processes such as domain-wall motion and the nucleation of domains of reverse magnetization. Fluctuation viscosity affects, to a greater or smaller extent, all magnetic materials subject to hysteresis. In the late 1940s descriptions of magnetic viscosity in terms of fluctuation fields (Néel) and activation energy distributions (Street and Woolley) were developed. The two approaches will be described. An analysis of the time dependent phenomena exhibited by magneto-optical films will be presented as a simple example of the application of activation energy modeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358275
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