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  • 1990-1994  (4)
  • 1985-1989
  • 1975-1979
  • 1994  (4)
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  • 1990-1994  (4)
  • 1985-1989
  • 1975-1979
Year
  • 1
    Electronic Resource
    Electronic Resource
    Spin reorientation transition in Ni films on Cu(100) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6434-6436 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic anisotropy of Ni films grown on single-crystal Cu(100) was studied in situ using the surface magneto-optic Kerr effect. The easy axis of magnetization lies in the plane of the film for ultrathin films and it is perpendicular to the film above a switching thickness. This behavior is attributed to a specific contribution to the magnetocrystalline anisotropy energy induced by a change in the film microstructure above a critical thickness. In the Ni/Cu(100) system, the magnetoelastic interface anisotropy favors perpendicular magnetization which becomes comparable to the shape anisotropy at the switching thickness. We compare the switching thickness and magnetization of films grown using different processing conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358240
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dependence of keV x-ray generation on the temporal and spatial separation of two KrF laser pulses (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5047-5053 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generation of keV x-ray emission from plasma produced by a 15 mJ 90 ps KrF laser pulse focused to an 8 μm spot on a copper target preceded by a similar 8 mJ pulse is studied experimentally. The change in efficiency of generation of keV x rays by the second pulse due to the presence of plasma produced by the preceding laser pulse on target is investigated as a function of the spatial and temporal separation of the laser pulses. When closely overlapped in space and time the pair of pulses behave like a single higher intensity pulse. When separated in space by more than 100 μm the two pulses behave independently generating x rays at the same rate as they would as two separate pulses. However, when overlapped in space and separated in time the x-ray generation by the second pulse is enhanced for small temporal separations and then suppressed for larger temporal separations due to the plasma created by the first pulse. These results can be explained by the initial production of hot plasma which enhances x-ray generation followed by the production of an extended colder plasma from the unloading of the shock heated target surface which suppresses keV x-ray production by the second pulse. The observed time of transition from enhancement to reduction of x-ray generation agrees with the time for the hot initial plasma due to the first laser pulse to expand and cool significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357216
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interfacial anisotropy and magnetic transition of cobalt films on Cu(111) : 38th Annual Conference On Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6406-6408 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We measure the magnetic properties of ultrathin films of Co epitaxially grown on single crystal Cu(111) using surface magneto-optic Kerr effect. The magnetic behavior is compared with that of the same films, but covered by Cu overlayers to study the effects of film morphology on ferromagnetism. The uncapped films show mainly in-plane anisotropy, but a weak perpendicular magnetization is always present. Capping a 1.5 monolayer (ML) Co film with Cu significantly enhances perpendicular anisotropy with 1 ML of Cu overlayer eliminating the in-plane magnetization completely. The perpendicular magnetization reaches its maximum value with 3 ML of Cu overlayer, ∼5 times higher than the uncapped films, and then decreases as more Cu is deposited. Annealing can further increase the perpendicular magnetization with the in-plane component remaining weak. In sharp contrast, this perpendicular anisotropy enhancement by Cu overlayers is not seen for Co films on Cu(100). The temperature dependence of magnetization fits to the phenomenological power law M∼(1−T/TC)β with β=0.15±0.05 for the uncapped 1.5 ML Co film and shows a linear behavior after the film is covered by Cu overlayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355366
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Chemical aspects of mass spawning in corals. I. Sperm-attractant molecules in the eggs of the scleractinian coral Montipora digitata (1994)
    Springer
    Marine biology 118 (1994), S. 177-182 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper provides the first evidence for sperm chemotaxis in the Scleractinia. Montipora digitata Dana, 1845 (Scleractinia: Coelenterata) is a hermaphroditic coral which reproduces bi-annually, releasing egg-sperm bundles during the mass spawning at Magnetic Island (19°10′S; 146°52′E) in late spring-early summer, and autumn each year. The buoyant egg-sperm bundles float to the surface where they break apart, releasing eggs and sperm into the ocean. Fertilisation occurs after ∼30 min. Unfertilized eggs were collected, washed free of sperm, and freeze-dried. The eggs were extracted with dichloromethane, fractionated by chromatography on silica gel, and the fractions assayed for their ability to attract M. digitata sperm. The active fraction was further fractionated by high-performance liquid chromatography, resulting in the isolation of three highly unsaturated fatty alcohols: (1) dodeca-2,4-diynol; (2) tetradec-13-ene-2,4-diynol; (3) (14Z)-heptadeca-14,16-diene-2,4-diynol. Of these three compounds, only Compound 1 attracted sperm of M. digitata. Synthetic Compound 1, produced from simple precursors by known reactions, possessed sperm-attracting activity comparable to the naturally derived attractant. Preliminary experiments suggest that the natural mixture of Compounds 1, 2 and 3 in the ratio 1:4:9 is more effective in attracting sperm from M. digitata than sperm from other Montipora species. Sperm attractants may act to reduce the incidence of hybridisation between different species of Montipora.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349783
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    Paper (German National Licenses)
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