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  • 1985-1989  (3)
  • 1988  (3)
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  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Electrical transport properties of thin epitaxially grown iron films on GaAs (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4291-4293 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have determined the components of the magnetoresistance tensor through fifth order in the magnetic direction cosines for four epitaxially grown iron films with thicknesses between 200 and 60 A(ring) at 300, 77, and 4.2 K. We have also determined their magnetic anisotropy parameters from ferromagnetic resonance at 300 K. These phenomenological parameters provide an excellent description of the magnetic field dependence of the planar magnetoresistivity for electric current directed along the [001], [11¯0], and [11¯(2)1/2 ] directions and the applied fields necessary to produce spin flops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340205
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic aftereffect in textured Ni/Cu compositionally modulated alloys (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3223-3223 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The existence of a magnetic aftereffect ("magnetic viscosity'') in textured Ni/Cu multilayered alloys was established1 using a vibrating sample magnetometer at room temperature and at 86 K. It was shown that the effect is strongly dependent on the step field, H2 (i.e., the value the field is reduced to after the magnetic moment has been aligned in high field), and exhibits a maximum relaxation rate for values of H2 around the reverse coercive field, Hc. Aftereffect behavior of this type has been observed in other materials, though most often for systems composed of superparamagnetic particles, where the relaxation freezes out at low temperatures. In contrast, the relaxation is enhanced at low temperature in the present situation. Several questions remain open from this earlier work. Among these are: is the effect a property of a thin Ni film or is it attributable to the compositional modulation of the alloy?; what is the exact form of the time decay and what is the mechanism that causes this effect? In order to resolve some of these issues the magnetic aftereffect has been measured in more detail and for longer periods of time at both temperatures (room and 86 K) in a new set of [111]-textured, layered Cu/Ni alloys of varying thicknesses. The slab thickness of the Ni, dNi, was varied between 6 and 30 A(ring), and the ratio dNi/(dNi+dCu) between 0.1 and 0.8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340848
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Postsynaptic bimodal effect of sulpiride on locomotor activity induced by pergolide in catecholamine-depleted mice (1988)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 337 (1988), S. 115-117 
    Details
    ISSN: 1432-1912
    Keywords: D-1/D-2 receptors ; Reserpine ; Akinesia ; Locomotor activity ; Pergolide ; Sulpiride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In reserpinized (5 mg/kg, s.c.) mice treated with alpha-methyl-p-tyrosine (200+100 mg/kg, i.p.), increasing doses of the D-2 antagonist sulpiride had varying effects on locomotor activity induced by the mixed D-1/D-2 agonist pergolide (2 mg/kg, s.c.). Low doses of sulpiride (1 mg/kg, i.p.) significantly enhanced this activity whereas at higher doses (50 mg/kg) an inhibitory effect was observed. Amphetamine (3 mg/kg, i.p.) failed to reverse akinesia in this animal model, precluding the possibility of a presynaptically mediated phenomenon; in contrast, mice receiving reserpine alone showed a high degree of locomotor activity when challenged with amphetamine. The bimodal effect of sulpiride is thought to be mediated either by two different D-2 receptors located on the same cell or by the same receptor with different topographical localization on postsynaptic neurons mediating opposite functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00169487
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    Paper (German National Licenses)
    Fulltext
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