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  • 1
    Digitale Medien
    Digitale Medien
    Propagation of terahertz bandwidth electrical pulses on YBa2Cu3O7−δ transmission lines on lanthanum aluminate (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2265-2267 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We study the propagation of terahertz bandwidth electrical pulses on high critical current density c-axis oriented YBa2Cu3O7−δ (YBCO) coplanar transmission lines deposited epitaxially on the low dielectric loss substrate lanthanum aluminate (LaAlO3). The losses on the YBCO transmission line are lower than on an equivalent gold line on the same substrate at temperatures below 50 K. At higher temperatures, absorption and dispersion of the ultrashort electrical pulses are observed in reasonable agreement with Mattis–Bardeen theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101519
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  • 2
    Digitale Medien
    Digitale Medien
    Rare-earth substitution in (BiYCa)3(FeSiGe)5O12 bubble films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 325-327 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The substitution of Y by Sm, Tb, Gd, and Ho in (BiYCa)3 (FeSiGe)5O12 bubble garnet is shown to have large effects on the growth-induced anisotropy Kgu. The presently accepted film composition intended for 6- or 8-μm period bubble memory devices demands partial substitution of Y by Gd and Ho. However, comparing films grown under the same growth conditions it is observed that YGdHoBiIG films possess less Kgu than their Gd, Ho-free counterparts. Thus, to satisfy Kgu requirements, the supercooling during growth must be increased by 20 K to 80 or 85 K with undesirable effects on defect densities. A new film composition containing Sm, Tb, and Gd has been formulated to satisfy all known material property specifications for 6- or 8-μm period memory devices. It can be grown with only 45–50 K supercooling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338824
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of growth atmosphere on rare-earth iron garnets grown from PbO-based fluxes (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 564-570 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The growth atmosphere over a PbO fluxed melt can significantly affect the platinum and lead concentrations and the magnetic properties of rare-earth iron garnet films grown from that melt. We have investigated this effect using the simple composition (Gd2.5Eu0.5Fe5O12. The films were grown in N2, air, and O2 atmosphere on (111) MgCaZr substituted GGG substrates (substrate lattice parameter a0=12.497 A(ring)) by conventional liquid-phase-epitaxy techniques from PbO and PbO/B2O3 fluxes. Lead is incorporated self-compensatingly from the flux as Pb2+ and Pb4+. The oxygen partial pressure of the growth atmosphere affects the platinum incorporation in the film through the equilibrium between neutral elemental Pt0 and ionic Pt4+ species in the melt. Incorporation of elemental species such as Pt0 in the film is unfavorable, but oxidized Pt4+ ions are accommodated in the lattice in concentrations that depend on their melt concentrations and distribution coefficients. Lead and platinum concentrations were determined by x-ray fluorescence. The incorporation of lead and platinum increased the lattice parameter and the index of refraction of these garnets. The diamagnetic octahedral substitution of Pt had a predictable effect on the magnetic properties, increasing the saturation magnetization and decreasing the Curie temperature, cubic anisotropy, and gyromagnetic ratio. Least-squares analysis and annealing studies showed that lead makes a positive contribution to the growth-induced anisotropy that seems to depend only on the concentration of the Pb2+ species. Platinum incorporation causes a negative contribution to the growth-induced anisotropy that can be annealed out at temperatures of 850–950 °C.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336614
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  • 4
    Digitale Medien
    Digitale Medien
    Ferroelectric-like phase transition at about 320 K and crystal growth of tungsten-bronze-type Na13Nb35O94 (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1797-1799 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The atomic coordinates of tungsten-bronze-type Na13Nb35O94, determined by Craig and Stephenson [J. Solid State Chem. 3, 89 (1971)], are characteristic of one-dimensional ferroelectric crystals. The transition temperature from the ferroelectric-like to the hypothetical paraelectric phase is predicted to be about 340 K, on the basis of these room-temperature atomic coordinates. Calorimetric and dilatometric measurements indicate a gradual transition that is complete on heating by about 320 K. Dielectric permittivity and loss measurements exhibit broad but minor anomalies at about 340 K over the frequency range 0.4–100 kHz. The dielectric loss at 10 kHz is very low, at 0.0035. The spontaneous polarization is predicted to be about 0.3 C m−2. Crystals with maximum dimensions of 2 cm in diameter by 5 cm in length along the c axis have been grown.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.342909
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  • 5
    Digitale Medien
    Digitale Medien
    Effect of diamagnetic substitution on growth-induced anisotropy in (YBi)3Fe5O12 (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 718-720 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Films of (Y3−x−yBixPby) (Fe5−zGaz)O12 (z=0–1.1) and (Y3−x−yBixPby) (Fe5−wInw)O12 (w=0–0.6) garnets were prepared by liquid-phase epitaxy. The effects of tetrahedral Ga and octahedral In substitution on the Bi-based growth-induced uniaxial anisotropy in (YBi)3Fe5O12 films were measured. Both Ga and In resulted in a linear decrease in the anisotropy with increasing substitution. The effect of octahedral In was twice that of tetrahedral Ga.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337419
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  • 6
    Digitale Medien
    Digitale Medien
    Growth-induced anisotropy in bismuth: Rare-earth iron garnets (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 2488-2497 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The bismuth-doped rare-earth iron garnets, (R3−x−yBixPby)Fe5O12 (Bi:RIG, R=Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y), were prepared under constant growth conditions to investigate the influence of ionic species on the bismuth-based growth-induced uniaxial anisotropy Kgu. The effect of ionic species on growth-induced anisotropy in Bi:RIG was not consistent with the ionic size model of site ordering. In particular, Bi:SmIG, Bi:EuIG, and Bi:TbIG displayed high growth-induced anisotropies, up to 331 000 erg/cm3 at room temperature for x≈0.5. The temperature dependence of these Kgu's was somewhat higher than that of the well studied Bi:YIG. The site ordering of Bi can be modeled by assuming that small, low-oxygen-coordination BiO+3−2ww melt complexes have a strong site selectivity for small, high-oxygen coordination sites at the growth interface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337163
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  • 7
    Digitale Medien
    Digitale Medien
    Oxide and Fluoride Laser Crystals (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 23 (1993), S. 453-502 
    Details
    ISSN: 0084-6600
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ms.23.080193.002321
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  • 8
    Digitale Medien
    Digitale Medien
    Crystal structure of Eu4Al2O9 [europium aluminum oxides] (1969)
    s.l. : American Chemical Society
    Inorganic chemistry 8 (1969), S. 1320-1324 
    Details
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ic50076a024
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  • 9
    Digitale Medien
    Digitale Medien
    Phase transitions in ordered barium-rare earth-molybdenum perovskites (1971)
    s.l. : American Chemical Society
    Inorganic chemistry 10 (1971), S. 922-926 
    Details
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ic50099a012
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  • 10
    Digitale Medien
    Digitale Medien
    Variation of the temperature coefficient of collapse field in bismuth-based bubble garnets (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4043-4045 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: To achieve wide temperature operation of magnetic bubble devices, the bias magnet field must remain within the material bias margins over the entire temperature range. It is therefore best that the slope of the bubble collapse field be matched to that of the bias magnet field. However, the slope of the collapse field of unmodified Bi:YIG is 50% greater than the slope of the field of the commonly used barium ferrite magnet. We used an approximation to the collapse field formula to show its dependence on magnetization and wall energy and the effect of substitution of various classes of rare earths. In particular, we have tested the effect of additions of Gd, Sm, and Eu on 1-μm Bi:YIG bubble materials. Collapse field, magnetization, and wall energy were fitted to quadratic functions of temperature from −50 to 150 °C. Gd, the traditional slope-reducing additive, affects the collapse field through the magnetization but also introduces substantial nonlinearity, which can lead to large deviations of the collapse field from the bias field at extreme temperatures. Sm introduces a strongly temperature-dependent rare-earth component of anisotropy that reduces the slope of the collapse field through the wall energy. Eu incorporates both these effects and, owing to its singular magnetic properties, results in the most nearly linear temperature dependence of the collapse field and the best approximation to the bias magnet.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.334665
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