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  • 1
    Electronic Resource
    Electronic Resource
    Raman scattering from cubic boron nitride up to 1600 K (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1955-1956 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Raman scattering measurements on cubic boron nitride up to 1600 K are reported. The results indicate that at 1600 K the interatomic force constant is only ∼10% weaker than at room temperature and that cubic BN is therefore a good candidate for applications where high-temperature mechanical strength is required. However, contrary to the behavior found for diamond, where the frequency changes with temperature were very nonlinear, it is found that in boron nitride both the TO and LO shift linearly with temperature at a rate of −0.036 cm−1/K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351671
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  • 2
    Electronic Resource
    Electronic Resource
    Thin-film modeling for mechanical measurements: Should membranes be used or plates? (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4244-4248 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The two limits for modeling vibrating thin films, viz as a plate or as a membrane, are discussed. In terms of these limits the sources of experimental uncertanties are identified and the advantages of using films which can be modeled as membranes are explained. The mathematical formalism for treating films as vibrating membranes is developed and relations for self-consistency checks are presented. The drive mechanisms used to generate vibrations in the films are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350804
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between structural phase transitions and elastic anomalies in metallic superlattices (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7370-7375 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed study of the structural and elastic properties of Fe/Cu superlattices has been performed. These superlattices exhibit a structural phase transition as a function of layer thickness in which bcc α-Fe transforms into fcc γ-Fe. This structural phase transition in which the Fe layers become coherent with the Cu layers is signaled by clear-cut changes in elastic and magnetic properties. The elastic properties studied through this transition indicate that in-plane coherency plays an important role in the elastic behavior of metallic superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354028
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  • 4
    Electronic Resource
    Electronic Resource
    Refractive index and elastic properties of single-crystal corundum (α-Al2O3) up to 2100 K (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 772-776 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that Brillouin scattering can be used to measure the elastic and optical properties of materials to very high temperatures. We have measured the elastic constants C11, C33, and C44 of single-crystal sapphire in the temperature range 300–2100 K extending by 300 K the highest temperature previously attained with ultrasonic resonance techniques. The temperature dependence of the ordinary and extraordinary refractive indices no and ne in the same temperature range have been obtained for the first time. Although both no and ne are temperature dependent, the ratio no/ne is found to be almost temperature independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349633
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  • 5
    Electronic Resource
    Electronic Resource
    The elastic and electromechanical properties of tetragonal BaTiO3 single crystals (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7327-7332 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: From velocity of sound measurements, obtained using Brillouin scattering and ultrasound techniques, the elastic and piezoelectric constants at room temperature have been determined on high-quality monodomain tetragonal BaTiO3 single crystals. The elastic constants are in fair agreement with those measured previously by the low-frequency equivalent circuit method. However, the electromechanical properties are significantly different. It is suggested that high frequency relaxation may have an influence on the measurements of those parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349751
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  • 6
    Electronic Resource
    Electronic Resource
    Elastic properties of TiN/(VxNb1−x)N superlattices measured by Brillouin scattering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4955-4958 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Brillouin scattering measurements have been carried out on single-crystal lattice-matched TiN/(V0.6Nb0.4)N and mismatched TiN/NbN superlattices. Measured surface wave velocities were found to be independent of superlattice wavelength over the entire range investigated, 1.5–30 nm, and were averages of the measured velocities of pure homogeneous TiN, NbN, and (V0.6Nb0.4)N. These results indicate that there is no anomaly in the C44 elastic constant. X-ray diffraction results from the superlattices indicated that the average lattice spacing did not vary with wavelength. This is consistent with previous observations where elastic anomalies were related to changes in lattice spacing. The absence of a correlation between the C44 elastic constant and previously reported hardness enhancements indicates that the latter are not caused by anomalies in C44; they could, however, be correlated with other elastic moduli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350644
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of Fe/Cr and Fe/Cu superlattices (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4801-4801 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Both the static and dynamic magnetic properties of sputtered Fe/Cr and Fe/Cu superlattices are compared. The static magnetization is measured by vibrating sample and SQUID magnetometry as well as conversion electron Mössbauer spectroscopy. The spin-wave spectra are measured by Brillouin light scattering (BLS). Although the structure of these two systems as determined by x-ray diffraction are similar, the magnetic properties differ greatly. In Fe/Cr, the Fe layers couple antiferromagnetically (AF), which can be correlated with an enhanced magnetoresistance. Both the strength of AF coupling and the size of the magnetoresistance are found to have a maximum value for Cr thicknesses of 11 A(ring) and increase with decreasing Fe thickness. Broad spin-wave spectra are observed by BLS and there is little indication of surface anisotropy. In contrast, Fe/Cu shows no indication of AF coupling of the Fe and a perpendicular surface anisotropy is observed. Very well-resolved spin-wave modes showing the band structure expected for a ferromagnetically coupled magnetic superlattice are observed in the BLS spectra. The relationship between the interface structure and the varying magnetic properties will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348234
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  • 8
    Electronic Resource
    Electronic Resource
    Elastic properties of water under negative pressures (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 8392-8396 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using Brillouin scattering we have investigated the elastic properties of water under negative pressures. The samples were H2O liquid–vapor inclusions in α-quartz which could be heated to their homogenization temperatures (in the range 120–370 °C); on cooling, negative pressures as high as 1000 bars were reached before a vapor bubble nucleated. The velocity of sound results obtained from our Brillouin experiments indicate that nucleation occurs long before reaching the mechanical instability region where the bulk modulus is zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464497
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  • 9
    Electronic Resource
    Electronic Resource
    Vibrating membrane elastometer for reliable measurement of mechanical properties of metallic films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 494-501 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an apparatus for measuring the biaxial mechanical properties of metallic films. A circular knife-edge support forms a drum-head geometry over which the film to be studied is stretched. The film's tension is obtained from the frequency of its membrane modes, and its strain by using an optical technique. The biaxial modulus is obtained from the ratio of tension and strain. An electronic detection system is developed that regeneratively locks to the film's resonant frequency. The system is also capable of measuring the film's damping when the lock is switched off.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142093
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  • 10
    Electronic Resource
    Electronic Resource
    Brillouin scattering and diffracted magneto-optical Kerr effect from arrays of dots and antidots (invited) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7096-7100 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of nanoarrays have been investigated using Brillouin scattering, magneto-optical Kerr effect (MOKE) and diffracted-MOKE (DMOKE) techniques. The anisotropies in negative arrays are found to be due to the shape of the holes and not due to the array itself. The DMOKE results allow us to extract the domain pattern at remanence. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1359789
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