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  • Elsevier  (421)
  • American Institute of Physics  (48)
  • American Institute of Physics (AIP)  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal properties of γ-Mn (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5303-5303 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mn can exist in a fcc environment in many alloys with other elements of the 3d-transition series. Some of these alloys, which can contain more than 50 at. % Mn, are classified as Invar. They show large magnetovolume effects and at the same time have ferromagnetic, antiferromagnetic, or mixed magnetic ground states. In order to gain a better understanding of Invar systems incorporating Mn, a closer examination of this element in a fcc environment is necessary. The γ state of Mn (fcc or fct Mn) is relatively little known, since its stability range lies only between 1364 and 1410 K. However, it is possible to stabilize γ-Mn in a temperature interval ranging from low temperatures up to about 600 K by the addition of small amounts of Cu. We have measured the specific heat (300〈T〈600 K) and thermal expansion (4〈T〈600 K and 1100〈T〈1300 K) of three MnCu alloys containing 4.42, 6.75, and 8.55 at. % Cu. The specific heat shows a first-order transition at Tt, which is the temperature below which the lattice undergoes a tetragonal distortion. This distortion is accompanied by an abrupt appearance of antiferromagnetism. The same effect is seen in the thermal expansion which shows a volume increase associated with the lattice distortion and the magnetic ordering. The high-temperature value of the thermal expansion coefficient is the largest so far observed in any fcc 3d system (45×10−6 1/K). From this data we estimate the thermal expansion behavior of pure γ-Mn. We obtain the atomic volume in the nonmagnetic and antiferromagnetic state and compare it to theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344590
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetovolume effects and structural transformations in CoMn alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5268-5270 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co100−xMnx alloys form a system with competing magnetic interactions in the concentration range 25≤x≤42 at. %. They have ferromagnetic ground states in the fcc and hcp structures for 0≤x≤25 at. % and antiferromagnetic ground states in the fcc structure for 42≤x≤52 at. %. The thermal expansion of this alloy system has been measured between 4 and 1200 K and positive magnetovolume effects have been observed in samples that have both ferromagnetic and antiferromagnetic ground states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344633
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  • 3
    Electronic Resource
    Electronic Resource
    Application of the time-resolved optical-beam-induced current method to the investigation of n-metal-oxide-semiconductor inverters (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3010-3018 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A pump and probe beam technique is demonstrated in conjunction with the optical-beam-induced current method of laser scanning microscopy which allows one to measure the dynamics of internal signals in integrated circuits. The time resolution of the measurement is limited only by the duration of the applied light pulses as well as the integrated circuit (IC) itself. The method is based on the generation of electrical pulses inside the IC switching a turned-off metal-oxide-semiconductor (MOS) transistor optically with short light pulses. The propagation of the electrical pulse in a chain of n-MOS inverters is studied on a subnanosecond time scale. A simple approach to the mechanisms of the generation of the optical-beam-induced current as well as the optical switching of MOS transistors is given. Optimum conditions for the laser beam power for both the excitation and the probe beam are discussed. The generation of the optical-beam-induced current in dependence on the position of the illuminating laser beam is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350983
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  • 4
    Electronic Resource
    Electronic Resource
    Order in thin films of a liquid crystalline polymer (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 3183-3190 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ordering effects of a side group liquid crystalline polymer PMA64 have been observed by the x-ray reflectivity technique. Thin films on float glass substrate are investigated as a function of temperature and film thickness. At 100 °C, a phase transition from a smectic-A to a nematic phase is observed. The layers of the smectic-A phase are oriented parallel to the surface giving rise to a Bragg peak which is coherently superimposed on Kiessig fringes. The Kiessig fringes are caused by interference of beams reflected at the polymer surface and the polymer–glass interface, while the Bragg peak originates from the electron density modulation perpendicular to the surface. As a function of film thickness, we observe a significant deviation of the integrated intensity of the Bragg peak as compared to the integrated intensity of a Bragg peak due to perfect periodic one-dimensional density modulations. A model which includes the influence of the interfaces as well as distortions of the first and second kind is used to describe this thickness dependence of smectic order in thin films of liquid crystalline polymers. The Bragg peak is lost at the smectic–nematic phase transition where we observe a significant roughening of the free surface. This effect is discussed with respect to molecular order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462867
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  • 5
    Electronic Resource
    Electronic Resource
    Polyparaphenylene under pressure: Optical absorption and vibrational modes (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1930-1934 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical absorption, Raman, and infrared (IR) spectra of undoped polyparaphenylene (PPP) have been studied under pressure up to 20 GPa at 300 K. PPP shows stable behavior, in marked contrast to the reactivity observed in trans-polyacetylene under pressure. The absorption edge of PPP shifts to lower energy with a total shift of 0.55 eV at 20 GPa. Raman spectra reveal a new band at about 820 cm−1 which becomes active above ∼5 GPa. At high pressure we find a considerable broadening of the infrared-active out-of-plane mode at 805 cm−1. The results are in part interpreted in terms of the larger interchain coupling induced by pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456035
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  • 6
    Electronic Resource
    Electronic Resource
    Line broadening of Ne-like xenon as a diagnostic for high-density implosion experiments : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2780-2782 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The broadening of x-ray spectral lines has become an established diagnostic of Ne in high-density plasmas, particularly those of interest in inertial confinement fusion (ICF). Work to date has concentrated mostly on the broadening of K-shell lines in moderate Z (Z∼10–20) ions in plasmas with electron densities up to 1024 cm−3. In this paper we report on calculations of line broadening for Ne-like Xe (Xe44+) appropriate for diagnosis of higher density plasmas with Ne∼1025 cm−3. These calculations have been performed with a recently developed state of the art computer code which treats the ion and electron broadening in the quasi-static and impact approximations, respectively. In this paper, we summarize recent work examining the behavior of the width of the Ne-like Xe 3–2 and 4–2 transitions with electron density. The broadening of the 1s–3p line in H-like Ar and the 1s2–1s3p transition in He-like Ar is also studied in order to benchmark the code used in the calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141829
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetovolume in fcc ferro- and antiferromagnetic 3d-metal alloys (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3921-3923 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermal expansion measurements as a function of temperature and magnetic field were carried out on Fe-Ni-Cr and Fe-Ni-Mn alloys. The magnetic contribution to the thermal expansion was determined with respect to the paramagnetic reference samples in the Fe-Ni-Cr and Fe-Ni-Mn series. We observe a general behavior that alloys which order ferromagnetically show a positive magnetovolume effect which persists to temperatures much higher than the Curie temperature, whereas in the case of antiferromagnetic ordering the magnetovolume effect is positive below temperatures slightly higher than the Néel temperature, and negative above it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340606
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  • 8
    Electronic Resource
    Electronic Resource
    Order–disorder transition and ordering kinetics in binary diblock copolymer mixtures of styrene and isoprene (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 2083-2088 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The order–disorder transition (ODT) and the ordering kinetics have been studied in two symmetric diblock copolymers of styrene and isoprene and their binary mixtures with rheology. The binary mixtures formed a single microdomain (with lamellar morphology) composed of short and long chains as confirmed by small angle x-ray scattering (SAXS). The order–disorder transition temperature (TODT), obtained from the discontinuity in the storage modulus G′, varies linearly with the number average degree of polymerization. For shallow quenches, the ordering kinetics proceed via nucleation and growth. The characteristic time of this process scales with N¯−1/3, where N¯ is the Ginzburg parameter, in agreement with the theoretical predictions [G. H. Fredrickson and K. Binder, J. Chem. Phys. 91, 7265 (1989)]. Our results indicate that the ordering kinetics of symmetric diblock copolymers near the ODT are fluctuation controlled. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470965
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  • 9
    Electronic Resource
    Electronic Resource
    Improved mode locking of a femtosecond titanium-doped sapphire laser by intracavity second harmonic generation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1550-1552 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The inclusion of a frequency doubling crystal in a self mode-locked titanium-doped sapphire laser stabilizes the mode-locking regime. 125 fs pulses at ∼800 nm are generated at 90 MHz repetition rate. Femtosecond second harmonic pulse trains of 10 mW average power are obtained for the first time in the spectral region around 400 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107247
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetization reversal in the picosecond range measured with time-resolved magneto-optical Kerr effect (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1729-1731 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed time-resolved magneto-optical Kerr effect measurements with picosecond resolution in a pump-probe experiment using a 30 ps pulsed dye laser (λ=577 nm). Two typical magneto-optical storage materials were investigated: a Gd13Tb12Fe75 amorphous film evaporated on a glass substrate and a Co/Pt multilayer on a Si substrate. Curie-point thermomagnetic writing has been performed in less than 2 ns with the Co/Pt multilayer, whereas with the amorphous film magnetization reversal could not be observed within 6 ns. These differences in switching times are likely the consequence of the different thermal conductivities of the substrates. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115889
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