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  • 1
    Digitale Medien
    Digitale Medien
    Nanophase dispersed SmCo films with high remanence and corrosion resistance (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6128-6130 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Nanophase dispersions of SmCo5 in either an Al or Co matrix have been synthesized by using pulsed laser deposition to deposit the SmCo aggregated grains while simultaneously sputtering either Al or Co. Smooth single phase type hysteresis loops were measured for both types of dispersed systems. SmCo5 plus Al dispersions were made that exhibited room temperature coercivities of 15 kOe with (approximate)5 at. % Al and decreased to 5.7 kOe with 21 at. % Al. The SmCo5 plus Al dispersions were only marginally affected by heating in air for 30 min to 300 °C. It was possible to make SmCo5 plus Co films with loop squareness of (approximate)0.83 and with room temperature coercivity (approximate)10 kOe by using a Co matrix. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372631
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic properties of Ti/Fe double layers grown on MgO(100) by direct current magnetron sputtering (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4943-4945 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The purpose of this work is to investigate the magnetic properties of Ti(tTi)/Fe(104 Å) bilayers deposited by dc magnetron sputtering onto MgO(100) substrates. In-plane ferromagnetic resonance (FMR) has been used to measure the resonance field HR and linewidth ΔH as a function of the azimuthal angle and Ti layer thickness. The FMR spectra were obtained at room temperature and at a microwave frequency of 12.3 GHz. The dependence of ΔH with respect to the azimuthal angle is explained by taking into account the combined effects of intrinsic damping and angular dispersion of the cubic axes. The dependence of the magnetic relaxation on Ti thickness exhibits two different regimes. It decreases for the first Ti layers (tTi〈30 Å) and increases up to a saturation value for Ti thickness around 90 Å. Other magnetic parameters such as effective magnetization, magnetocrystalline, and perpendicular anisotropies are also discussed. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370053
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  • 3
    Digitale Medien
    Digitale Medien
    Evaluation of densities and mobilities for heavy and light holes in p-type Hg1−xCdxTe molecular beam epitaxy films from magnetic-field-dependent Hall data (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 4327-4331 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The densities and mobilities of heavy and light holes have been simultaneously determined at various temperatures (1.2–300 K) in two molecular beam epitaxy-grown p-type Hg1−xCdxTe (x=0.224) samples from variable magnetic-field Hall measurements. The separation of the contribution from the light hole and heavy hole was achieved by a hybrid approach consisting of mobility spectrum analysis followed by a multicarrier fitting procedure. An acceptor energy level at ∼13 meV above the valence band, as well as various mass ratios of light to heavy holes for different temperature were obtained. In addition, the minority carrier (electron) and the surface two-dimensional electron concentrations and mobilities have also been derived as a function of temperature. The explicit experimental values obtained in this work should be useful to physics and modeling of HgCdTe infrared detectors. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.368652
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  • 4
    Digitale Medien
    Digitale Medien
    Free-carrier absorption of Hg1−xCdxTe epitaxial films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7738-7742 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Free-carrier absorption (FCA) of Hg1−xCdxTe epitaxial films is analyzed by considering the composition-in-depth nonuniformity of epilayers. The results show that epilayers exhibit different FCA behavior from bulk materials. Based on the analyses, the carrier concentration, the density and size distribution of Te precipitates, as well as the inclusion in Hg1−xCdxTe epilayers are derived from fitting the measured FCA spectra. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362342
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  • 5
    Digitale Medien
    Digitale Medien
    Empirical rule of intrinsic absorption spectroscopy in Hg1−xCdxTe (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1234-1235 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An empirical formula for the calculation of the intrinsic optical absorption coefficient at the Kane region is derived as α=αg exp[β(E−Eg)]1/2 from the measured absorption spectra in the whole intrinsic absorption region for Hg1−xCdxTe with different composition x from 0.170 to 0.443. The parameter β depends on composition x and temperature T, β=24−18x at 300 K and β=5.4+11x at 77 K. The calculated results from this simple empirical formula also agree well with those derived from the Kane model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356464
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  • 6
    Digitale Medien
    Digitale Medien
    Spectra analysis of annealed Hg1−xCdxTe molecular beam epitaxial films (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1376-1378 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This letter discusses the analysis of infrared and visible spectra of Hg1−xCdxTe thin films deposited by molecular beam epitaxy (MBE) onto a CdTe buffer layer on a GaAs substrate. The spectra were obtained by infrared transmission and spectroscopic ellipsometry. Two mathematical techniques, fast Fourier transform (FFT) of the multiple reflectance spectrum associated with a multilayer system and fractional-derivatives spectra (FDS) were employed. Compared to the conventional fitting procedure, the FFT method directly offers the thickness of individual layers. It can also provide insight into the interfaces. The FDS method, however, gives information of composition and lattice perfection, which is useful in in situ real-time monitoring during the MBE run. The results show that annealing increases the compositional grading of Hg1−xCdxTe MBE films. Furthermore, the crystal microstructure deteriorates due to the irregular arrangement of diffusing atoms in the lattice sites. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122377
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  • 7
    Digitale Medien
    Digitale Medien
    Direct observation of vibrational modes in Hg1−xCdxTe (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3272-3274 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The vibrational modes in Hg1−xCdxTe epitaxial films and HgTe/CdTe superlattices have been investigated by means of far-infrared (FIR) transmittance spectra at temperatures from 4.2 to 300 K. The observations were put forward in the spectral range from 20 to 350 cm−1, emphasizing the wave-number region at the low-frequency side of the reststrahlen absorption band. A series of single-phonon and two-phonon modes as well as impurities- and defects-induced vibrational modes are observed. FIR transmission seems to be a good probe for characterization of the perfection of Hg1−xCdxTe films. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116571
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  • 8
    Digitale Medien
    Digitale Medien
    Transport properties of Hg0.80Mg0.20Te grown by molecular beam epitaxy (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 6170-6173 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Variable magnetic-field Hall measurement has been used to investigate the transport properties in Hg0.80Mg0.20Te molecular beam epitaxy films in the temperature range from 1.5 to 250 K. The experimental data have been analyzed by using a hybrid approach consisting of the mobility spectrum (MS) technique followed by a multicarrier fitting (MCF) procedure. Both the Shubnikov–de Haas measurements and the hybrid MS+MCF approach show three- and two-dimensional electronic behaviors. The two-dimensional electrons, with mobility in the range of 1–3×103 cm2/V s and a sheet density about 1012 cm−2, are found and come from an accumulation layer near the HgMgTe–CdTe interface or the HgMgTe–vacuum interface. The temperature-dependent evolution of the bulk electron mobility indicates that the scattering mechanism in HgMgTe is very similar to that in HgCdTe, that is, ionized impurity scattering dominates at low temperature while lattice scattering dominates above 100 K. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.368932
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  • 9
    Digitale Medien
    Digitale Medien
    Logarithmic approximation for the energy band in nonparabolic semiconductors (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7668-7671 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We propose a semi-empirical logarithmic approximation to the conduction band of small gap semiconductors. This approximation enables us to obtain analytical expressions for the intrinsic absorption coefficient and free electron density, and these expressions are valid for a large temperature range. We show that the exponential variation of the absorption coefficient, as observed by Chu et al. [J. H. Chu et al., J. Appl. Phys. 71, 3955 (1991)] in Hg1−xCdxTe, can be fitted very well for any temperature using only a few parameters whereas the analytical expression for free electron density is useful in optical and transport simulations. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.367887
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  • 10
    Digitale Medien
    Digitale Medien
    Enhanced room temperature magnetoresistance response in textured La0.7Sr0.3MnO3 strips made by pulsed laser deposition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6770-6772 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magnetoresistive La0.7Sr0.3MnO3 polycrystalline films have been deposited by high laser pulse energy pulsed laser deposition that exhibit an extreme variability in the temperature of the resistance maximum, Tp, as a function of the deposition conditions. Films have been deposited that exhibit the resistance maximum at temperatures ranging from 155 to 360 K as a function of laser pulse energy and shadowing conditions. High laser pulse energies, shadowing to eliminate film particulates, and a specific laser pulse rate range, were necessary to synthesize films with the temperature of the resistance maximum elevated to room temperature. The room temperature low field magnetoresistive response of samples with Tp approximately room temperature was highly anisotropic with respect to applied magnetic fields in plane and perpendicular to the plane. The (110) textured films exhibited an enhanced low field magnetoresistance compared to films with appreciable (111) texture. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372836
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