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  • 1
    Electronic Resource
    Electronic Resource
    Epitaxial growth of ferromagnetic Ni2MnGa on GaAs(001) using NiGa interlayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 7357-7359 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heusler alloy Ni2MnGa thin films have been grown pseudomorphically on a relaxed NiGa interlayer on GaAs(001) by molecular-beam epitaxy. In situ reflection high-energy electron diffraction patterns, ex situ x-ray diffraction, and cross-sectional view transmission electron microscopy electron diffraction patterns confirm the single-crystal growth of Ni2MnGa. The films grow pseudomorphically on the relaxed NiGa interlayer with a tetragonal structure (a=b=5.79 Å and c=6.07 Å). Magnetic measurements using vibrating sample and superconducting quantum interference device magnetometers reveal Ni2MnGa to have an in-plane easy axis and a Curie temperature ∼350 K. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326461
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  • 2
    Electronic Resource
    Electronic Resource
    The investigation of the process of microwave bubble generation in bubble material (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4609-4615 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The first observation of the process of magnetic bubble generation by microwave excitation has been made. A high-speed optical sampling microscope system was employed to sense the evolution of the bubble with time. The dependence of the microwave power threshold for bubble generation on experimental conditions such as microwave frequency, microwave pulse width, and dc bias field are reported. Magnetic garnet films with the composition Y1.92Sm0.1Ca0.98Fe4.02Ge0.98O12 were used as our experimental samples. The experimental results are not consistent with the theoretical predictions of the Seagle coherent rotation model for bubble generation. We find that the magnetization in the area driven by the strong microwave field responds rather noncoherently. Nucleation centers, which may be too small to be seen optically, are formed first. Under appropriate conditions, these centers may enlarge to a full size bubble. As examples, with a bias field setting of 65 Oe and the microwave frequency set at 550 MHz, about 25.5 dBm of power are required to generate a bubble from a 60-ns-long pulse; only 20.5 dBm are required if a 12-μs pulse is applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340139
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic bubble collapse in the presence of a microwave field (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3602-3609 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A bubble collapse experiment has been done on a garnet sample with the composition Y1.92Sm0.1Ca0.98Fe4.02Ge0.98O12 both with and without an applied local microwave field. To explain the experimental results, the analysis of bubble domain wall motion by Callen and Josephs has been modified by introducing a nonlinear velocity-drive characteristic. In the case of no microwave excitation, a good fit between the theory and the experimental data is then obtained. A bubble collapse model in the presence of a microwave field which includes contributions from microwave-produced "dipolar pressure'' and "intrinsic pressure'' has been made. While some discrepancies exist between theory and experiment, nevertheless these results may be helpful in understanding the observations of microwave bubble generation reported by a number of research groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341396
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  • 4
    Electronic Resource
    Electronic Resource
    2000 h stable operation in 0.87 μm light-emitting diode using stress-free InGaP/GaAs/Si (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3605-3607 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown Al-free reliable 877 nm In0.49Ga0.51P/GaAs light-emitting diodes (LEDs) on Si substrates by metalorganic chemical vapor deposition. The conventional Al-containing Al0.3Ga0.7As/GaAs LEDs on Si substrates exhibit rapid degradations because of the formation of dark-line defects (DLDs). On the contrary, the In0.49Ga0.51P layer on the GaAs/Si substrate exhibited a 300 K electron mobility of 950 cm2/V s with the carrier concentration of 3.8×1017 cm−3, no residual stress and a lower surface recombination velocity. The In0.49Ga0.51P/GaAs LED on Si shows the stable operation for more than 2000 h, which results from the suppression of the formation of DLDs. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115332
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  • 5
    Electronic Resource
    Electronic Resource
    On the theory of multiple scattering for a nonpolar fluid composed of chiral molecules (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1540-1545 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A statistical theory of multiple scattering is given for a nonpolar fluid composed of chiral molecules. The theory describes through the correlation function the scattering intensities to all orders. The circular intensity differential due to the single scattering is discussed. The results show that the scattering intensities orthogonal to the direction of propagation of the incident light are slightly different when the light is right and left circularly polarized, while the intensities parallel to the direction of propagation are same.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453265
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  • 6
    Electronic Resource
    Electronic Resource
    On the circular dichroism of a nonpolar critical binary liquid mixture (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5881-5882 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The circular dichroism of a nonpolar binary liquid mixture is discussed in the critical region, where the Ornstein–Zernike approximation does not hold. The correlation function to be used is the Fisher form. We suggest a new experimental method to measure the critical exponent for correlation function by using the present result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452518
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  • 7
    Electronic Resource
    Electronic Resource
    On the critical behavior of optical activity of a nonpolar binary liquid mixture (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1739-1743 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A statistical mechanical theory is presented for the dielectric tensor of a multicomponent fluid composed of chiral molecules. Explict expressions are obtained for circular dichroism and optical rotation of a binary liquid mixture in the critical region. The expression for circular dichroism suggests an alternative method of determining the critical parameters of a fluid mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450472
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  • 8
    Electronic Resource
    Electronic Resource
    A simplified model for the Briggs–Rauscher reaction mechanism (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 2710-2717 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A model for the Briggs–Rauscher reaction mechanism with four intermediates and seven steps is proposed by simplifying the model of De Kepper and Epstein [J. Am. Chem. Soc. 104, 49 (1982)]. Assigning suitable rate constants for the steps of the simplified model, we obtain numerical results for the nonlinear dynamic behaviors such as oscillations, limit cycle, multistability, and inverse regulation of the iodine concentration. The results are compared with experiments and other previous models. The comparison shows that the present simplified model expresses the nonlinear dynamic behaviors better than the previous models. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1491243
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  • 9
    Electronic Resource
    Electronic Resource
    Synergistic effects of the safety factor and shear flows on development of internal transport barriers in reversed shear plasmas (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 748-751 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new suppression mechanism of turbulent transport, characteristic of the synergism between safety factor and shear flows, is proposed to explain the internal transport barriers (ITBs) observed in neutral-beam-heated tokamak discharges with reversed magnetic shear. It is shown that the evolution of turbulent transport with the strength of the suppression mechanism reproduces the basic features of the formation and development of ITBs observed in experiments. In addition, the present analyses predict the possibility of global ion and electron heat transport barriers. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1445753
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  • 10
    Electronic Resource
    Electronic Resource
    Gyrokinetic study of the electron temperature gradient instability in plasmas with slightly hollow density profiles (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3635-3644 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron temperature gradient driven instabilities in plasmas with slightly hollow density profiles are studied. The gyrokinetic integral eigenvalue equation valid for a sheared slab configuration is employed. The Debye shielding effect on the modes is investigated. The effects of a sheared E×B flow on the modes are considered. Six modes with even or odd parities are found to be simultaneously unstable. The mixing length estimate for the transport is calculated. The flow shear suppression on the modes, as well as on the transport, is demonstrated. The correlations of the results with helical system Heliotron/Torsotron and tokamak experiments are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1381564
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