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  • 1985-1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Magneto-optical study of uranium additions to amorphous TbxFe1−x (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1103-1107 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent reports of huge magneto-optical Kerr rotations in certain crystalline metallic uranium compounds prompted a study of the magnetic and magneto-optical effects of uranium additions to a rare-earth transition metal amorphous alloy. Using variable composition samples, the polar Kerr effect at a small spot (e.g., 0.5 mm diam) was measured as field, temperature, and composition were varied. Points on the Curie line and the edges of the compensation region were determined from these observations. The compositions studied included (TbxFe1−x)1−yUy with 0.125≤x≤0.550 and y=0.0, 0.04, 0.07, 0.16. The addition of uranium to TbxFe1−x depresses the TC of Tb-rich material much more strongly than that of Tb-poor material. The compensation region does not shift at all with increasing y. It appears that uranium does not contribute to the magnetization of these amorphous alloys, nor does it significantly affect the magneto-optical effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338206
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  • 2
    Electronic Resource
    Electronic Resource
    Use of the longitudinal magneto-optical Kerr effect to study nonmagnetic/magnetic bilayers (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6098-6100 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of longitudinal magneto-optical Kerr effect (LMKE) measurements on bilayers consisting of a thick permalloy film covered by varying thicknesses of Nb. The LMKE pertains to situations in which light with a finite angle of incidence is reflected from a plane surface, and M in the sample is parallel both to the plane of incidence and the surface. Either s- or p-linearly polarized 6328-A(ring) light is incident on the sample at 60° to the normal. The two components of the complex Kerr rotation are measured with a modulation technique utilizing a λ/4 plate and a Faraday rotator driven by dc and 2000-Hz signals. With cycling of an in-plane magnetic field, square magneto-optical hysteresis loops are observed in both rotation and ellipticity. There is a change in sign, as well as a decrease in the magnitude of the switching discontinuity in these quantities with increasing overlayer thickness. These results are very similar to those of the corresponding idealized boundary value problem. The technique gives experimental information on the magnetic properties of films buried below a nonmagnetic material or of thin films bounded on both sides by a nonmagnetic material. Further, it gives a probe of the phase and intensity of optical frequency electric fields below a reflecting surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342105
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spin resonance in EuxSr1−xS with x=0.4, 0.5, and 0.54 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3488-3490 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron spin resonance has been studied in single crystal spheres of EuxSr1−xS with samples of nominal composition x=0.4, 0.5, and 0.54. The emphasis has been on the field for resonance of x=0.4 material at 11.65 GHz at temperatures between 4.2 and 1.65 K. Even at the lowest temperatures the lines do not vary with crystal orientation. In all samples there is a depression of the field for resonance beginning at about 10 K, and increasing to the lowest temperatures. This is interpeted as an "internal'' field Hi. Measurements at 17 GHz reveal that Hi for all three compositions decreases with increasing frequency. Surprisingly, at 1.65 K, this seems to vary with sphere size for the x=0.4 composition. In addition to the experiments on spheres, a small plate-shaped specimen of x=0.4 was studied. It too showed a large depression of the field for resonance at 1.75 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335035
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  • 4
    Electronic Resource
    Electronic Resource
    Intrinsic anisotropy of Tb-Fe films prepared by magnetron Co sputtering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3897-3899 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Tb-Fe thin films have been produced by dual-gun dc magnetron cosputtering, which allows a moderate range of compositions (spanning about 20 at. %) to be deposited in a single run under identical conditions. The films exhibit clean M-H loops and torque curves which are somewhat anomalous but show consistent trends. Films deposited at room temperature with a composition in the range 17–30 at. % Tb showed a positive intrinsic anisotropy of roughly 3×106 erg/cm3, resulting in an easy axis of magnetization that is perpendicular to the plane of the film, while films with 〉37 at. % Tb had a small negative intrinsic anisotropy (ca. −2×105 erg/cm3). The temperature dependence of the anisotropy indicates that neither uniaxial stress nor shape anisotropy can account for most of the intrinsic uniaxial anisotropy observed, so we hypothesize that the large anisotropy must be due to pair ordering or a local anisotropy field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334908
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  • 5
    Electronic Resource
    Electronic Resource
    Aging effects on amorphous Tb–transition-metal films prepared by diode and magnetron sputtering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3900-3902 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied and compared the aging characteristics of the amorphous Tb(FeCo) films from both dc getter diode and magnetron sputtering. No protecting layer such as SiO2 or Al2O3 was put on the films. Fresh films of 1.0-μm thickness from diode sputtering showed a perpendicular anisotropy and well-behaved magnetic properties using a vibrating sample magnetometer and an automatic torque magnetometer. We noticed a decrease in perpendicular anisotropy when the films were exposed to the air. However, this aging phenomenon was not observed in films of the same thickness prepared by magnetron sputtering even after seven months' exposure to the air. The reasons for the difference are due to two distinct reaction mechanisms: bulk reaction in diode-sputtered films and surface reaction in magnetron-sputtered films. A variation of the microstructure is believed to attribute to this. The surface reaction was studied in thinner magnetron-sputtered films of 10 and 25 nm, where the surface-to-bulk ratio is larger. A decrease in perpendicular anisotropy with aging was observed in these thinner films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334909
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  • 6
    Electronic Resource
    Electronic Resource
    Magneto-optic waveguide hysteresis loops of "planar'' magnetic garnet films (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3342-3347 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial films of modified yttrium iron garnet which are used as optical waveguides for magneto-optic devices have nominally planar anisotropy so that their magnetization can be aligned by small in-plane fields. Films grown on (111) substrates usually have some residual cubic anisotropy that is difficult to measure in the active layer of the double- or triple-layer films used in single-mode waveguides. A new method to determine the magnetic properties of the optically active layer itself has been developed. It is based on magneto-optical hysteresis loops in which the Faraday rotation of the waveguided light is plotted against one component of a rotating in-plane magnetic field. Steps in these hysteresis loops are directly related to the sixfold symmetry of the magnetocrystalline anisotropy of these films. The influence of linear birefringence on the measured Faraday rotation, the magnetostrictive effects associated with the pressure of the prism used for optical coupling into the waveguide, and the advantages of end-fire coupling are discussed. These hysteresis loops are being used in the design of materials for magneto-optic isolators and other waveguide devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344131
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  • 7
    Electronic Resource
    Electronic Resource
    CALCIUM ANTAGONISTS AND HYPERTENSION (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 15 (1988), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Calcium antagonists, including verapamil, are now used widely in the management of patients with hypertension.2. Six weeks of chronic therapy with verapamil (50 mg/kg per day, orally) to produce a plasma level of 80–100 ng/ml in Sprague-Dawley rats depletes cardiac noradrenaline (NA) without apparently causing β1 adrenoceptor ‘up’ regulation.3. The effect of verapamil on cardiac NA is rapidly reversed upon verapamil withdrawal.4. Chronic therapy with nisoldipine (100 mg/kg per day, orally) had no effect on cardiac NA.5. Verapamil (50 mg/kg per day, orally) and nisoldipine (100 mg/kg per day, orally) therapy for 6 weeks prevented the time-dependent increase in systolic blood pressure in SHR rats.6. Binding studies with (—)[3H]-D888 (desmethoxyverapamil) indicated that the affinity of the phenylalkylamine binding sites is higher in hearts of SHR relative to hearts from age-matched (25 weeks) WKY and SD, without any change in density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1988.tb01050.x
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  • 8
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    David T. Runia,. "Philo of Alexandria and the "Timaeus" of Plato" (Book Review) (1988)
    Berkeley, Calif. : Periodicals Archive Online (PAO)
    Journal of the history of philosophy. 26:4 (1988:Oct.) 658 
    Details
    ISSN: 0022-5053
    Topics: Philosophy
    Notes: BOOK REVIEWS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:b151-1988-026-04-000011
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  • 9
    Electronic Resource
    Electronic Resource
    Gersh, Stephen: Middle Platonism and Neoplatonism. The Latin Tradition : Notre Dame, IN, University of Notre Dame Press, 1986 (1988)
    Cambridge : Cambridge University Press
    The @classical review 38 (1988), S. 71-73 
    Details
    ISSN: 0009-840X
    Source: Cambridge Journals Digital Archives
    Topics: Classical Studies
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0009840X00113447
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  • 10
    Electronic Resource
    Electronic Resource
    Viscosity and molecular weight distribution of ultrahigh molecular weight polyethylene using a high temperature low shear rate rotational viscometerThe opinions or assertions about specific products identified by brand name contained herein are the private views of the authors and are not to be construed as conveying either an official endorsement or criticism by the U. S. Department of Commerce, the U. S. Department of Health and Human Services, the National Bureau of Standards, or the Food and Drug Administration. (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 567-582 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: To obtain accurate measurements of the limiting viscosity number (LVN) or the intrinsic viscosity [η] of solutions of ultrahigh molecular weight polyethylene (UHMWPE), a low shear floating-rotor viscometer of the Zimm-Crothers type was constructed to measure viscosities at elevated temperatures (135°C) and near zero shear rate. The zero shear rate measurements for UHMWPE whole polymer and UHMWPE fractionated by hydrodynamic crystallization were compared with viscosity measurements at moderate and high shear rates (up to 2000 s-1) carried out in a capillary viscometer. The limiting viscosity number of UHMWPE decreases, as expected, with shear rate. The higher shear rate data could not be extrapolated to yield the correct zero-shear rate viscosities. Fractionation of UHMWPE gave 10 fractions ranging in LVN from 9 to 50 dL/g. A tentative integral molecular weight distribution for the whole polymer was calculated on the basis of the Mark-Houwink equation, but because it had been previously established only for lower molecular weight polyethylenes, it may not be accurate. A correlation was found between the LVNs for the fractions in the two types of viscometers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360310
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