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  • 1990-1994  (148)
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  • 1
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    Unknown
    Generalized Radon Transformation inversion for elastic parameters using PP, Ps, SP, and SS seismic data (1990)
    Soc. Exp. Geophys.
    In:  60th Annual Meeting of SEG, San Francisco, Soc. Exp. Geophys., vol. 10, no. GL-TR-89-0259, pp. 1199-1202, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1990
    Keywords: Inversion ; Seismics (controlled source seismology) ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
    facet.materialart.
    Unknown
    In reply: auger electron angular distributions from surfaces: forward focusing or silhouettes? (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, X D -- Han, Z L -- Tonner, B P -- Chen, Y -- Tong, S Y -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1129-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17733375" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Magnetic and structural properties of Co/Cr multilayers with in-plane anisotropy : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6053-6055 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previously we studied the effect of Cr spacer layer on in-plane coercivity in Co/Cr multilayered films. It was found that the high coercivity is related to the easy axis in-plane orientation and the character of the composition modulation. In this paper, the dependence of the saturation magnetization as a function of Co layer thickness is used to study the interface structure. The layer structure is confirmed by small angle x-ray diffractometry for typical films. The magnetic interaction among the grains is studied by examining deviation from the behavior predicted by the Wohlfarth model for noninteracting single-domain particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350043
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of microstructure on coercivity of c-axis in-plane-oriented Co/Cr multilayered films : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4541-4543 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of the insertion of nonmagnetic Cr planes on coercivities of thin Co films has been studied in Co/Cr multilayered films. The in-plane coercivity Hc(parallel) can be as high as 1800 Oe and can be adjusted easily, ranging from 650 to 1800 Oe. The large Hc(parallel) is related to the Co(110) in-plane orientation which is induced by a Cr(100) in-plane-oriented underlayer. In addition, it appears that a decreasing saturation magnetization Ms, a decreasing average structural coherence length D in the direction perpendicular to the film, and a narrowing distribution of D are correlated to the increasing in Hc(parallel). The effects of texture, Cr interlayers, D and its distribution, and the Cr underlayer on the magnetic properties are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348353
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetization reversal in Co/Cr multilayer films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6353-6355 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization reversal of Co/Cr multilayer films is studied by utilizing initial magnetization curves, minor loops, isothermal and dc demagnetization remanence curves, and temperature dependence of the loops. Electron microscope observations reveal that the films consist of columnar grains of size from 400 to 800 A(ring). It is suggested that the magnetization reversal is dominated by rotation of single-domain grains. Numerical calculations are performed based on the Stoner–Wohlfarth coherent rotation model for noninteracting, single-domain particles of uniaxial anisotropy. The calculated results agree qualitatively with the experimental results. To investigate the quantitative differences, magnetic interactions among the grains are measured in terms of deviations from the linear Hankel plot predicted by Wohlfarth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352646
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  • 6
    Electronic Resource
    Electronic Resource
    Barrier height temperature dependence of Au/InP from photoreflectance spectroscopy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3447-3450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The barrier height of Au/InP was measured at various temperatures from Franz–Kelydsh oscillations (FKO) of photoreflectance spectroscopy. It appears that the photoinduced voltage can not be neglected especially at low temperature. The presently observed barrier height temperature dependence confirms the theory of Hecht [M. Hecht, Phys. Rev. B 41, 7918 (1990)]. Also, the mixture between FKO and E0+Δ0 oscillations was observed. The degree of mixture varies with temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355291
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic and structural properties of CoCrTa films and multilayers with Cr (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4710-4712 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report our studies of epitaxial growth of CoCrTa films on Cr underlayers and the properties of CoCrTa/Cr multilayers. The coercivity, Hc, strongly depends on Ta composition, sputtering conditions, and the thicknesses of the magnetic layer and Cr underlayer. An Hc value of 1300 Oe was obtained for a Ta composition of 2 at. %, a Cr underlayer thickness of 4000 A(ring), and a magnetic layer thickness of 400 A(ring). The x-ray data show that the high Hc occurs when crystallites of the Cr underlayer and CoCrTa layer are aligned with the Cr (200) and CoCrTa (110) planes in the film plane. Thus, the c axis of the CoCrTa lies essentially in the plane of the film. When the thickness of the magnetic layer increases above 1000 A(ring) the c axis begins to tip out of the film plane. The basal plane lattice parameter varies roughly linearly with Ta content up to 13 at. %. For the CoCrTa/Cr multilayered films, Hc values up to 1200 Oe were obtained although the c-axis orientation of the magnetic layer becomes somewhat dispersed. Models for the dependence of magnetization reversal on microstructure are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344808
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  • 8
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance study of Cu(II) in the Cu(II) doped (NH4)2[Zn(NH3)2(CrO4)2] and (NH4)2[Cd(NH3)2(CrO4)2]: Orientational disorder of NH3 and dynamically induced structural change (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3897-3904 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron paramagnetic resonance (EPR) spectra recorded at X band on Cu(II) in the Cu(II) doped single crystals of (NH4)2[Zn(NH3)2(CrO4)2] and (NH4)2[Cd(NH3)2(CrO4)2] showed an unusual temperature dependence in the temperature range between 4.2 and 370 K. This unusual temperature dependence is attributed to the dynamics of NH3 molecules. It is concluded that NH3 undergoes an order–disorder transition. This transition occurs at 282±2 K (T*) for (NH4)2[Zn(NH3)2(CrO4)2] and at 300±5 K for (NH4)2[Cd(NH3)2(CrO4)2]. For temperatures above T* the EPR spectra are found independent of temperature. This observation indicates that the NH3 molecules behave as free rotors rotating about their threefold symmetry axis. As the temperature is lowered, the free rotation gradually becomes hindered which leads at T* to site doubling in the EPR spectra. The hindered rotation simultaneously induces a structural change at T* reducing the local symmetry at the Cu(II) site from C2/m to approximately Cs. In the temperature range between T* and about 80 K, the EPR spectra with the magnetic field perpendicular to the threefold axis of NH3 are temperature dependent, but those with the magnetic field parallel to the threefold axis remain unchanged. This behavior is qualitatively interpreted as being due to the torsional oscillation of NH3. At temperatures lower than 80 K, the NH3 molecules exhibit the torsional oscillation of the lowest state and accordingly, all the EPR spectra become temperature independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462928
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  • 9
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance, electron nuclear double resonance, and electron spin echo envelope modulation of Fe(CN)3−6 in a KCl lattice (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4698-4707 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR), and electron spin echo envelope modulation (ESEEM) study has been carried out on Fe(CN)3−6 in a KCl lattice. The EPR spectrum showed the formation of a large number of centers, which correspond to different configurations of the charge compensating cation vacancies. The two major centers called center Ia and Ib have been well characterized. Both centers have orthorhombic symmetry and show a large g anisotropy. The principle g values are: gx =2.079, gy =3.054, and gz =0.400 for center Ia; gx =2.007, gy =3.177, and gz =0.752 for center Ib. The ligand field splitting and the orbital reduction factor k have been obtained through analyzing the spectra in terms of the generalized spin Hamiltonian. A number of unusual features observed in the EPR spectra have been found to be due to the high level of g anisotropy. The ENDOR and ESEEM measurements performed on center Ia revealed nearly all the coupling tensors between the unpaired electron and the 13C and 14N nuclei. The principle values and tensor orientations were precisely determined by least-squares fitting. The orientations of the coupling tensors give a detailed picture of the complex under the influence of the two cation vacancies. The coupling constants of 13C were found to be an order of magnitude larger than those of 14N. Level anticrossing was observed for the nuclear spin states of 14N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457738
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  • 10
    Electronic Resource
    Electronic Resource
    The first x-ray diffraction station at Beijing Synchrotron Radiation Laboratory, BEPC : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1078-1079 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The first x-ray diffraction experimental station at Beijing Synchrotron Radiation Laboratory has been available for synchrotron radiation users in research. The station is located on the back-end of 4B9A, a beamline from a bending magnet. When the storage ring of BEPC operates in a dedicated mode (2.2 GeV), 4B9A provides a focused monochromatic x ray in between 4 and 12 keV. A four-circle diffractometer with a crystal analyzer is installed. Experimental processes such as apparatus alignment, monitoring of incident radiation, acquisition of diffracted intensities, and running of the monochromator, are controlled with a computer through CAMAC modules. In this article, instrumentation and performances of the station are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143205
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