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  • 1990-1994  (39)
  • 1980-1984
  • 1991  (39)
  • 1
    Digitale Medien
    Digitale Medien
    CNDO calculations for phenylene rotations in polycarbonates (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 6123-6127 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00023a012
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic properties of ultrathin films of Ni/Cu(001) probed by soft-x-ray magnetic circular dichroism (abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5939-5939 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetic properties of MBE-grown ultrathin Ni films on a Cu(001) substrate are investigated using soft-x-ray magnetic circular dichroism (SXMCD) spectroscopic technique. These measurements are carried out by recording Ni L2,3 absorption spectra with highly circularly polarized soft x rays recently obtained at the AT&T Bell Laboratories Dragon synchrotron radiation beamline.1 For low Ni coverages, no MCD effect along the 〈100〉 direction is observed at room temperature, while for intermediate coverages, the MCD effect becomes appreciable and increases to its bulk value at ∼25 ML. With only the assumption that the unoccupied density of states of Ni lie mainly in the minority bands, the amount of the MCD effect can be related to the magnetic moment. The thickness and temperature dependence of the magnetic moment obtained from our SXMCD measurements are compared with those of Ni/Cu(111) obtained from magneto-optical data.2 The advantages and differences between the SXMCD and MOKE techniques are discussed. The novel SXMCD technique allows for element specific magnetic characterization of a variety of interesting structural architectures including 2 D films, dilute impurities, and disordered matrices.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350112
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  • 3
    Digitale Medien
    Digitale Medien
    Desorption spectra of laser ablation of Bi2Sr2CaCu2O8+x (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4643-4645 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Quantitative measurements of desorbed ions and neutral molecules by a mass spectrometer from laser ablation of Bi2Sr2CaCu2O8+x were obtained. The results indicate that more neutral atoms and molecules desorbed than the corresponding ions. The ratio of neutral atoms to ions decreases when the laser power density increases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349054
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  • 4
    Digitale Medien
    Digitale Medien
    Epitaxial yttria-stabilized zirconia on (11¯02)sapphire for YBa2Cu3O7−δ thin films (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 304-306 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Epitaxial yttria-stabilized zirconia (YSZ) films were deposited on (11¯02) sapphire by pulsed laser deposition. The films are formed in a cubic phase with the a axis normal to the substrate surface. Ion beam (2.8 MeV He++) channeling measurements show that the YSZ films are highly crystalline with a channeling minimum yield of 8%. The epitaxial relationship between the film and substrate is further confirmed by a cross-section transmission electron microscopy study. Epitaxial YBa2Cu3O7−δ thin films deposited on YSZ/sapphire have Tc and Jc of up to 89 K and 1×106 A/cm2 at 77 K, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104669
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  • 5
    Digitale Medien
    Digitale Medien
    Triisopropylantimony for organometallic vapor phase epitaxial growth of GaSb and InSb (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2532-2534 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In the past, trimethylantimony (TMSb) has been almost exclusively used as the Sb source in organometallic vapor phase epitaxy (OMVPE). However, TMSb decomposes at relatively high temperatures (above 500 °C). For growth at lower temperatures, TMSb is not an optimum choice. In addition, TMSb decomposition produces methyl radicals, a source for carbon contamination. Thus, it is important to investigate alternative Sb precursors. In this letter, we report the use of a newly developed Sb source, triisopropylantimony (TIPSb), for atmospheric pressure OMVPE. It is found that both GaSb and InSb can be grown with good surface morphologies at temperatures between 430 and 600 °C. The high growth efficiencies indicate that there are few parasitic reactions between TIPSb and trimethylgallium (TMGa) or trimethylindium (TMIn). The GaSb layers grown at 500 °C have background hole concentrations of 2×1016 cm−3. Low-temperature photoluminescence (PL) measurements indicate that the acceptor is due to Sb vacancies rather than carbon acceptors. The InSb epilayers have electron concentrations of about 5×1016 cm−3 at 77 K and low-temperature PL shows well-resolved exciton and acceptor-related peaks. These results indicate that TIPSb is a viable source for the OMVPE growth of Sb-containing III-V semiconductors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104817
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  • 6
    Digitale Medien
    Digitale Medien
    Variation of the mobility and the two-dimensional electron gas concentration with indium composition in δ-doped GaAs/InxGa1−xAs/GaAs pseudomorphic structures (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4332-4335 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The electron mobility and the two-dimensional electron gas (2DEG) concentration in different indium compositions (0.1〈x〈0.6) δ-doped GaAs/InxGa1−xAs/GaAs pseudomorphic structures grown by low-pressure metalorganic chemical vapor deposition are studied. The electron mobilities of a δ-doped GaAs layer are comparable to those of previous reports. Furthermore, the maximum mobility (5500 and 33 000 cm2/V s at 300 and 77 K, respectively) of the proposed pseudomorphic structure appears at x=0.37. Taking into account of strain and quantum effects, the variation trends of calculated 2DEG concentrations are in good agreement with the experimental results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349113
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  • 7
    Digitale Medien
    Digitale Medien
    Hydrogen induced radial anisotropic R-Fe-B magnet (R=Pr,Dy) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5518-5520 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of alloying concentration of Dy and the absorption amount of hydrogen on the magnetic properties of PrFeB magnets have been studied in this work. Experimental data show that the easy direction of magnetization (EDM) of the Pr-Fe-B-H system is determined by hydrogen concentration. Radial anisotropic magnets can be obtained from hydrogenated Pr15Fe79B6 powders with hydrogen of 4500 ppm. A slight decrease of hydrogen content down to 4250 ppm leads to a uniaxial anisotropic magnet. Partial replacement of Pr by Dy significantly influences the anisotropy of the Pr-Fe-B-H system with saturated hydrogen. A 0.9 at. % Dy substitution for Pr changes the anisotropy of hydrogen decrepitated powders from planer to cone, thus resulting in an isotropic magnet. As the amount of Dy substitution increases to 1.35 at. %, the EDM of magnets persist in the field direction during alignment compaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347986
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetic properties and microstructure of light rare earth substituted 2:17 magnets : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5853-5855 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Partial substitution of light rare earths (LRE) for Sm in 2:17 magnets improves the remanence, maximum energy product and the loop squareness without affecting their Curie temperature and the temperature dependence of 4πMs. Uniform, single-phased microstructures were obtained for LRE substituted magnets after heat treatment. Heat treated metallographic specimens revealed striations on the etched surfaces parallel within each grain and perpendicular to the c axis of the magnet alloy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348937
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  • 9
    Digitale Medien
    Digitale Medien
    Element specific magnetic moments of gadolinium iron garnet probed by soft-x-ray magnetic circular dichroism (abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6338-6338 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The element specific magnetic moments of Gd and Fe in a gadolinium iron garnet (Gd3Fe5O12) were probed at various temperatures by measuring the soft-x-ray magnetic circular dichroism (SXMCD) at the Gd M4,5 and the Fe L2,3 adsorption edges in an external field of 5 kG. The soft-x-ray absorption spectra were recorded with the photocurrent method using highly circularly polarized soft x rays recently obtained at the AT&T Bell Laboratories Dragon synchrotron radiation beamline.1 The temperature dependence of the SXMCD signal at each edge allows one to independently determine the magnetic ordering of each specific ion. Our individually probed magnetic moment of the Gd3+ ion and of the two Fe3+ ions in different sites confirm the earlier calculations which predict a reversal of the local magnetic orientation at ∼280 K. This work demonstrates that SXMCD is a valuable tool for probing the element and site specific magnetic properties of multicomponent systems. The applications of this novel technique to the investigation of transition metals and rare earths in ferromagnetic alloys, compounds, disordered, and impurity systems will be addressed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349961
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of NdF3 and NdCl3 substitution for Nd2O3 on the reduction–diffusion process of Nd–Fe–B powders : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6612-6614 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of partial substitution NdX3 (X=F or Cl) for Nd2O3 on the reduction–diffusion (R/D) process of Nd–Fe–B powders has been investigated. NdX3 reacts with Ca in the R/D process to produce CaX2. CaCl2 is distributed uniformly around the Nd2Fe14B grains after reaction. During water washing, CaCl2 reacts quickly with water. This improves the disintegration of compacts and facilitates the removal of Ca. The best results with residual Ca content of 400 ppm and oxygen content of 3000 ppm were obtained. In the case of fluoride, however, a negative result was found. There was no improvement in the disintegration of fluoride compact. This was due to the poor water affinity of CaF2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349874
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