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  • 1990-1994  (6)
  • 1975-1979
  • 1960-1964
  • 1993  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallographic orientation of textured CoCrTa/Cr sputtered thin film media for longitudinal recording (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5117-5124 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the influence of deposition conditions on the structure and properties of Co84Cr14Ta2 alloy magnetic thin films and Cr underlayers sputtered onto circumferentially textured and smooth polished NiP/Al substrates. Suitable processing conditions provide in-plane magnetic anisotropy in the textured media, with enhanced coercivity (Hc) and coercivity squareness (S*) in the circumferential direction and reduced Hc and S* in the radial direction. The crystallography in these films was studied by transmission electron microscopy (TEM) to address the origin of the observed magnetic anisotropy. The CoCrTa alloy grains are found to grow semicoherently on the chromium underlayer, resulting in vertical 〈200(approximately-greater-than) Cr and 〈112¯0(approximately-greater-than) CoCrTa axes. This requires an in-plane orientation of the CoCrTa c axis, which is observed to be nearly random by high-resolution TEM. Microdiffraction shows apparent preferred c-axis alignment locally at texture lines, but this observation is primarily attributable to asymmetric tilting of the vertical growth direction caused by the substrate topography. The 〈112¯0(approximately-greater-than) growth axis appears to be perpendicular to the local grooved surface, not the bulk surface, requiring a local c-axis out-of-plane tilt near the grooves. The anisotropic surface topography induces a corresponding anisotropy in the out-of-plane component of the magnetically easy c axis in the CoCrTa alloy, which we suggest has implications on the bulk magnetic anisotropy in such films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353785
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Delta-M, vertical component, and media noise of NiP- and Cr-underlayer media for longitudinal recording : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5542-5544 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Media having Cr-underlayer and NiP-underlayer were compared using transmission electron microscopy (TEM), delta-M, torque (vertical component), and media noise measurements. TEM micrographs show that NiP-underlayer media were more isolated than Cr-underlayer media. Of the Cr-underlayer media, CoCrTa media seem to exhibit grain isolation. The grain size of NiP-underlayer media was smaller (30 nm) than that of Cr-underlayer media (60 nm). Results indicate that media with isolated grains seem to have higher vertical component than media with more continuous grains. The NiP-underlayer media exhibits lower media noise than the Cr-underlayer media. This is attributed to smaller and more isolated grains in the NiP-underlayer media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353644
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of microstructural features on media noise in longitudinal recording media : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5566-5568 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-resolution transmission-electron microscopy (HRTEM) has been used to analyze CoCrTa, CoCrPt, and CoNiCrPt alloy thin films deposited under similar conditions onto NiP plated Al substrates with a Cr underlayer. Apparent ∼50 nm Co alloy grains observed by bright field TEM are found to be clusters of smaller 10–20 nm grains with a common growth orientation. Subtle differences have also been observed in the stacking fault density, Co alloy fcc phase concentration, lattice mismatch, and grain separation in the films. In particular, HRTEM shows that the CoCrTa film has clear physical separation between the 10 and 20 nm grains, which is not observed in the other media. Despite similar hysteresis loop properties, the signal-to-noise ratio of CoCrTa is 2.3 dB higher than CoCrPt and 4.6 dB higher than CoNiCrPt. Small isolated grains have been shown to improve media noise, as is observed in CoCrTa media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353652
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transport characteristics of Tl2Ba2CaCu2O8 bicrystal grain boundary junctions at 77 K (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 411-413 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the fabrication and characterization of thin-film grain boundary junctions in Tl-based superconductors on bicrystal substrates. Post-deposition processed Tl2Ba2CaCu2O8 films were grown on bicrystal SrTiO3 substrates, with varying degrees of misorientation angle θ. Critical current densities and current-voltage curves had a strong dependence on θ. For θ≥10°, there was a two-to-three order of magnitude reduction in critical current density, and for θ≥20°, the current-voltage curves displayed resistively shunted junction behavior. These high angle grain boundary junctions have features at 77 K that are attractive for device applications, including sharp voltage onsets, well-behaved dc magnetic and rf field dependence, IcRn products as large as 300 μV, and low 1/f noise. Simple dc superconducting quantum interference devices fabricated with these junctions exhibited transfer functions of up to 30 μV/Φ0 at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108918
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  • 5
    Electronic Resource
    Electronic Resource
    Preparations ofN, N′-ethylene-bridged dipeptides(eXX) constructed from (S)-methionine, -tryptophan, -tyrosine and-N(ɛ)-benzyloxycarbonyllysine through acid-catalyzed cyclization (1993)
    Springer
    Amino acids 4 (1993), S. 187-192 
    Details
    ISSN: 1438-2199
    Keywords: Amino acids ; Acid-catalyzed cyclization ; N, N′-Ethylene-bridged dipeptides ; (S)-Methionine ; (S)-Tryptophan ; (S)-Tyrosine ; (S)-N(ɛ)-Benzyloxy-carbonyllysine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary N, N′-Ethylene-bridged bis-(S)-methionine[(2S, 7S)-2, 7-bis(2-methyl-thioethyl)-3,6-diazaoctanedioic acid] derived from (S)-methionine and 1,2-dibromoethane was cyclized and esterified simultaneously in boiling ethanol in the presence of an appropriate amount of strong acid such asp-toluenesulfonic acid, affording a cyclic compound,N, N′-ethylene-bridged (S)-methionyl-(S)-methionine ethyl ester {ethyl(2S, 3′S)-4-(methylthio)-2-[2′-oxo-3′-(2-methylthioethyl)-1′-piperazinyl] butanoate}, exclusively in 80–90% yields. It was also found that, by applying this method, 70–80% yields of the otherN, N′-ethylenebridged dipeptides containing (S)-tryptophan, -tyrosine and -N(ɛ)-benzyloxycarbonyllysine were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805814
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of LAK cells on expression of HLA-DR antigen on laryngeal carcinoma cell line in new culture systems (1993)
    Springer
    European archives of oto-rhino-laryngology and head & neck 250 (1993), S. 224-228 
    Details
    ISSN: 1434-4726
    Keywords: Laryngeal carcinoma ; Three-dimensional tumor ; Flow cytometry ; LAK cell ; HLA-DR antigen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We demonstrated the enhancement of HLA-DR antigen expression on cultured laryngeal carcinoma cells (Hep 2) by in vitro cultivation with LAK cells using flow cytometric and immunohistological analysis. For in vitro cultivation of tumor cells with LAK cells, we used newly developed experimental systems (the Transwell double-dish system and experimental three-dimensional tumors). In flow cytometric analysis, expression of HLA-DR antigen on tumor cells was compared before and after co-cultivation with LAK cells. When tumor cells were cultured separately with LAK cells in a Transwell Petri dish and the expression of HLA-DR antigen on tumor cells was analyzed by flow cytometry, the expression of HLA-DR antigen on tumor cells was increased in a dose-dependent manner related to the number of LAK cells used. Furthermore, when anti-interferon-γ monoclonal antibody was added to the experimental system, enhancement of HLA-DR antigen expression was blocked. These findings were consistent with immunohistological studies, in which experimental three-dimensional Hep 2 cell tumors were established in double-layered agar with/without being co-cultivated with LAK cells. The expression of HLA-DR antigen in this system was significantly increased when compared to such expression before cultivation with LAK cells. These findings suggested that the culture systems employed in this study could be a possible model for examining solid tumor in vivo biological responses. This enhanced expression of HLA-DR antigen may also represent one of the multifactorial responses seen with adoptive LAK cell immunotherapy for solid tumors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171529
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    Paper (German National Licenses)
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