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  • 1
    Electronic Resource
    Electronic Resource
    Scaling properties of branched polyesters (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 1946-1959 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00194a072
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of R2Fe14B single crystals (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4091-4093 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A whole new class of high-performance permanent magnet materials is based on the ternary tetragonal structure R2Fe14B, where R is one of the rare-earth elements. We have successfully grown single crystals of this structure with R=Y, Nd, and Tb. Y is a nonmagnetic rare-earth substitute, while Nd and Tb couple ferro- and ferrimagnetically, respectively, relative to the iron moment. All three of the compounds have [001] easy axes at room temperature, although the Nd compound exhibits a spin reorientation away from the [001] below about 150 K. Nd2Fe14B has a saturation induction at room temperature of 16.2 kG, which places an upper limit of approximately 65.6 MGOe on the energy product obtainable by magnets based on that material. While Tb2Fe14B exhibits a smaller magnetization because of ferrimagnetic coupling of the rare earths and the iron, it also has an extremely large magnetic anisotropy which is nearly temperature independent between 4.2 and 300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334681
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  • 4
    Electronic Resource
    Electronic Resource
    Phase-separated Fe and Co particles in a BN matrix (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3320-3322 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using co-sputtering, 10–300 A(ring) particles of Fe and Co have been prepared in an insulating BN matrix. The Fe particles have the α-Fe structure. The saturation magnetic moment of the iron particles per at. % Fe was found to be approximately independent of the Fe concentration and equal to the value of α-Fe. The system undergoes a metal–nonmetal transition at approximately 40 vol % Fe. For concentrations of Fe particles above this threshold the temperature dependence of the resistivity is metallic and the room-temperature coercivity is large (50–100 Oe). For the Co particles, the room-temperature coercivity is about twice as large as Fe above the metal–nonmetal threshold. Below the metal–nonmetal threshold the particles behave as superparamagnets and the coercivity is approximately zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338977
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Properties of electrodeposited Co-Cu multilayer structures (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4067-4069 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alternate layers of Co and Cu of individual layer thicknesses from 1.5 to 8.0 nm and total thickness of about 100 layers and of Co bilayers separated by Cu have been electroplated from an electrolyte having a low concentration of Cu and a high concentration of Co atoms. The properties of the resulting structures have been analyzed using SEM, x-ray diffraction, VSM, and FMR methods. Comparable structures have also been fabricated by e-beam evaporation in high vacuum for comparison purposes. X-ray diffraction patterns indicate only the fcc structure. Assuming the Co thickness to be that deduced from the plating charge, we infer 4πM values in the range 6.0–14.5 kG from VSM and FMR. Some uniaxial anisotropy is apparent in this system. These results are similar to those of earlier work on thin fcc Co layers in the same range of thicknesses, where the room-temperature moment was reduced but depended only slightly on layer thickness, and where the uniaxial anisotropy was observed to be small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338529
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetism and the observation of NMR lines in hexagonal Al4Mn and icosahedral Al-Mn alloys (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4364-4365 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previous measurements of the magnetic susceptibility and the intensity of the 55Mn NMR line in a number of periodic and quasiperiodic (i.e., icosahedral) Al-Mn and Al-Mn-Si alloys suggested some correlation, in that the 55Mn line intensity decreases as the magnetic susceptibility increases. This correlation had led to the tentative conclusion that the reduction of the 55Mn line intensity is due to the magnetism, and that the "magnetic'' Mn atoms are not seen in the NMR. We have found that the above correlation breaks down in a very substantial way for hexagonal Al4Mn which (i) shows a small magnetic susceptibility, and (ii) no observable 55Mn line. Thus the reduction in intensity in the 55Mn NMR line in the icosahedral phase is not necessarily due to its magnetism but may have its origin in another line broadening mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338422
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  • 8
    Electronic Resource
    Electronic Resource
    Icosahedral symmetry versus local icosahedral environments in Al–Mn alloys from NMR (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 372-373 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] No known phase of aluminium and manganese has icosahedra bonded in the way Pauling suggests. However the 4G' phase of Al-Mn, having the A112W structure, was reported2 to exist as a metastable precipitate. In the G phase, the Mn-centred Al icosahedra are arranged on a body-centred cubic (b.c.c.) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326372a0
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Amphetamine response and relapse risk after depot neuroleptic discontinuation (1985)
    Springer
    Psychopharmacology 85 (1985), S. 277-283 
    Details
    ISSN: 1432-2072
    Keywords: Schizophrenia ; Amphetamine ; Neuroleptic discontinuation ; Relapse prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-five schizophrenic outpatient subjects in a depot neuroleptic discontinuation study received an amphetamine challenge approximately 6 weeks after their last dose. Only five of these showed greater than three-point increases in positive symptoms on the BPRS, and all five relapsed within 30 days of the challenge. The 20 with less than three-point increases in positive symptoms showed extremely variable stability, relapsing from 20–〉600 days after the challenge. Thus, increase in positive symptoms after amphetamine may identify a group at risk for rapid relapse after neuroleptic discontinuation, but lack of such a response gives little prognostic information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428187
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