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  • Electronic Resource  (284)
  • 1990-1994  (182)
  • 1985-1989  (102)
  • 11
    Electronic Resource
    Electronic Resource
    Magneto-optical properties and temperature dependence of SmCoDy films with perpendicular magnetic anisotropy (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5997-5997 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous LRE-TM SmCo perpendicular magnetic film provides a promising candidate for perpendicular magnetic recording media.1 In order to improve the magneto-optical properties of SmCo films, we have studied the ternary system: Smy(Co100−xDyx)100−y films which were prepared by rf magnetron sputtering system. Because the Dy moment is antiferromagnetically coupled to the Co moment and Dy has a larger magnetic anisotropy, Dy addition will increase Ku and decrease Ms of LRE-TM films. With the Dy addition content increased from 0 to 10 at. %, the perpendicular anisotropy constant K⊥ (K⊥ = Ku(K⊥=Ku− 2πM2s) increased to improve the magneto-optical properties of SmCo films. The torque curve measurement and Kerr hysteresis loop of SmCoDy film had proved it was perpendicular magnetic film. In order to prevent RE metal selective oxidation of SmCoDy films, a protective layer AlN was used. AlN films were prepared by rf reactive sputtering.2 The temperature dependence of AlN/SmCoDy/glass were studied. Hc decreased rapidly when temperature increased while its Kerr angle decreased slightly. When the sample was cooled to room temperature, Hc and θk returned to its original value. The results show SmCoDy films may become new material of magneto-optical recording media. The long-term stability and microstructure of SmCoDy films have also been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347790
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  • 12
    Electronic Resource
    Electronic Resource
    Dielectric and pyroelectric properties of lithium sodium niobate ceramics at low temperature (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2522-2524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dielectric and pyroelectric properties of lithium sodium niobate ceramics are investigated between the temperature range 320–120 K. The result is indicative of a first-order ferroelectric-ferroelectric phase transition at low temperature with a large thermal hysteresis. At temperatures near the phase transition, an unusual pyroelectric response is observed, which is attributed to the coexistence of the two ferroelectric phases. The result is in agreement with the measurement we made on the lithium sodium niobate single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348690
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  • 13
    Electronic Resource
    Electronic Resource
    Femtosecond spectroscopic study of ultrafast carrier relaxation in hydrogenated amorphous silicon a-Si:H (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1235-1239 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a study of spectral- and time-resolved reflectivity and transmission measurements on hydrogenated amorphous silicon (a-Si:H) with 50 fs time resolution. Electron-hole pairs are photoexcited into the extended states of a-Si:H by an ultrashort pump pulse at (h-dash-bar)ω=2 eV. The temporal evolution of the photoinduced optical response is studied for a broad range of excitation densities from 1018 up to 1020 cm−3, and on a timescale of up to 200 ps. The temporal evolution of the optical response is discussed in terms of recombination and trapping mechanisms for carriers in the extended states of a-Si:H.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353263
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  • 14
    Electronic Resource
    Electronic Resource
    Depolarized light scattering and dynamic shear compliance of viscoelastic liquids (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 508-514 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Efforts are made to relate the depolarized light scattering spectral power density to the dynamic shear compliance spectrum of a viscoelastic liquid. Generalized Langevin equations are used to describe the dynamics and coupling of reorientation and translational motions. It is shown that in the presence of the coupling, the depolarized scattering spectrum consists of two components; one is associated with the reorientational motion, and the other with the viscoelastic relaxation of the solution. Methods to obtain the dynamic shear compliance from the depolarized light scattering spectrum are described. It is also shown that in the limit of very slow reorientational motion, the depolarized light scattering spectrum is proportional to the imaginary part of the dynamic compliance spectrum, a result predicted by the Pockels photoelastic law.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463597
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  • 15
    Electronic Resource
    Electronic Resource
    Optical absorption probes of LixNa4−x (x=1,2): Geometry, substitution isomers, and composition-dependent electron delocalization (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4918-4923 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodepletion spectra (415–763 nm, 10 A(ring) effective resolution) were obtained for LiNa3 and Li2Na2 and compared to previous Na4 and Li4 measurements as well as to model calculations ranging from classical electrostatic to ab initio molecular orbital. Findings include (i) the assignment of planar rhombic singlet ground states for both molecules; (ii) in Li2Na2, the possibleobservation of predominantly one of three energetically close-lying planar rhombic or near rhombic substitution isomers; and (iii) in the sodium/lithium tetramer series, evidence for increasing localization of itinerant valence electrons with increasing cluster lithium content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462788
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  • 16
    Electronic Resource
    Electronic Resource
    The holographic investigation of diffusion of methyl red in poly(caprolactone) diol (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5211-5214 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The translational diffusion process of methyl red dissolved in poly(caprolactone) diol has been investigated as a function of temperature, using the laser induced holographic grating relaxation technique. The tracer diffusion coefficients of methyl red in trans and cis forms are found to follow the WLF type of temperature dependence with the WLF coefficients identical to that associated with the shear modulus of the polymer host. The cis isomer of methyl red although about 8% smaller in size diffuses about three times slower than the trans isomer. This is interpreted as due to a stronger interaction between the cis isomer and the polymer host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454756
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  • 17
    Electronic Resource
    Electronic Resource
    The geometry of small fullerene cages: C20 to C70 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 5007-5011 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ground-state structures of small fullerenes below C70 were determined by tight-binding molecular-dynamics total energy optimization. An efficient simulated annealing scheme was used to generate closed, hollow, spheroidal cage structures for all even-numbered carbon clusters from C20 to C70. As a general trend, fullerenes prefer geometries which separate the pentagonal rings as far apart as possible. Except for C60, C70, and C50, most fullerenes have relatively low symmetries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463854
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  • 18
    Electronic Resource
    Electronic Resource
    Optical absorption spectroscopy of sodium clusters as measured by collinear molecular beam photodepletion (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3787-3801 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Collinear molecular beam photodepletion was used to obtain particle specific electronic absorption information for Na3, Na4, and Na8 in a wavelength range from 370–835 nm. We critically discuss the experimental method used and the deconvolution procedure applied to the resulting data to yield absolute absorption cross sections. The spectra contain much information on the cluster-size–dependent transition from molecular to bulk-like optical response and are interpreted in terms of various computational approaches ranging from classical electrostatic to ab initio large scale configuration interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458765
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  • 19
    Electronic Resource
    Electronic Resource
    Holographic method for investigating the diffusion of dye molecules in the polymer host (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2603-2613 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser induced holographic grating relaxation studies of thymoquinone dissolved in amorphous poly(α-methyl styrene) have been carried out. The Onsager theory of mutual diffusion for binary and tertiary systems are utilized to analyze the shape of the diffraction intensity curve. Different line shapes that are associated with the relaxation of the diffraction intensity are interpreted in terms of the diffusion processes. Diffusion coefficients are obtained as a function of thymoquinone concentration from 0.3 to 20 wt. % at various temperatures. It is shown that at very low concentrations (less than 0.5%), the self-diffusion coefficients of the dye molecule and its photoproduct are obtained. Above 0.5% concentrations the diffusion coefficient rapidly increases with increasing dye concentration. The temperature dependence of the self-diffusion coefficient follows the Williams–Landel–Ferry equation, whereas the mutual diffusion coefficient at higher dye concentrations follows the Arrhenius equation. The self-diffusion coefficient rapidly decreases as the sample temperature is traversed across the glass transition temperature (Tg). However at finite dye concentrations there is no detectable effect owing to the onset of Tg on the mutual diffusion coefficient. The difference is attributed to the plasticizing effect of the dye molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457954
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  • 20
    Electronic Resource
    Electronic Resource
    Investigation of diffusion processes in poly(ethylene oxide)/poly(methyl methacrylate) blends by laser light scattering spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3160-3167 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Mutual diffusion in poly(ethylene oxide)/polymethyl methacrylate blends is investigated by using the photon correlation spectroscopic technique. The mutual diffusion coefficient and the static structural factor are measured as a function of concentration for various temperatures. The Onsager coefficient is obtained by simultaneous measurements of the diffusion coefficient and static structural factor. The result is employed to test theoretical predictions on the concentration dependence of the mutual diffusion coefficient of the polymer blend. The experiment results are found not in agreement with theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457643
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