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  • 1995-1999  (2)
  • 1985-1989  (2)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetoresistance in ferromagnet-insulator-ferromagnet tunnel junctions with half-metallic ferromagnet NiMnSb compound : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5515-5517 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnet-insulator-ferromagnet tunnel junctions with one NiMnSb electrode were studied to test the 100% conduction electron spin polarization predicted from band structure calculations performed on this compound. This phenomenon, known as half-metallic ferromagnetism (HMF), should result in significantly larger junction magnetoresistance (JMR) than in junctions using only conventional ferromagnetic materials such as Ni, Co, and Fe alloys which show JMR of up to 32%. Analysis by x-ray diffraction, Rutherford back scattering, SQUID, AFM, and STM confirm that the NiMnSb has the desired physical properties. A maximum JMR of 8.1% was observed in NiMnSb/Al2O3/Ni0.8Fe0.2 junctions at 77 K and 5.7% for NiMnSb/Al2O3/Co0.5Fe0.5. Maximum JMR for these two types of junctions at room temperature was 2.4% and 3.7%, respectively. The JMR observed is much lower than that expected for an HMF-I-FM junction. This could be due to scattering of the spins at the FM-I interfaces resulting from surface degradation of the NiMnSb, since the film growth requires deposition at elevated temperatures of 〉400 °C. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364586
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  • 2
    Electronic Resource
    Electronic Resource
    Spin polarized tunneling in half-metallic ferromagnets (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6265-6265 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a study of spin polarized tunneling in tunnel junctions in which one of the conducting layers is a half-metallic ferromagnet (HMF). HMF are unique in that the Fermi level of these materials intersect the majority spin electron band, while the minority band has an energy gap near the Fermi level. Hence, HMF simultaneously have both metallic and semiconducting characteristics, and theory predicts that the conduction electrons are 100% spin polarized. As a result, the magnetoresistance in magnetic multilayers or trilayer tunnel junctions is expected to be significantly higher than with conventional ferromagnetic materials. Two important parameters affecting the performance of these junctions are the smoothness of the HMF surface and its surface composition. Tunnel junctions consisting of a layer of NiMnSb, a barrier layer of Al2O3, and a layer of aluminum were prepared and studied for their tunneling properties. Surface analysis of HMF films was done using Auger depth profiling and AFM. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362029
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    LIFE PREDICTION OF 316 STAINLESS STEEL UNDER CREEP-FATIGUE LOADING (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1987), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Life prediction for creep-fatigue loading conditions should be related to creep damage mechanisms. In order to examine the effect of the creep damage mode on rupture life under creep-fatigue loading, a “combined creep-fatigue loading test” was carried out on 316 stainless steel. In this method, creep loading and fatigue loading are repeated alternately. The fracture criteria under combined loading closely depend on the creep fracture modes of the static creep test. A new life prediction method which uses this new fracture criterion is proposed. The criteria are changed when the creep damage mode varies. In order to verify the adequacy of this method, fatigue tests with a tensile strain-hold wave form were carried out. It is clear that rupture life in such fatigue tests is dependent on the chosen fracture criteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1987.tb00467.x
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  • 4
    Electronic Resource
    Electronic Resource
    Histochemical demonstration of adrenergic nerve fibres in the renal capsule of rats (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1222-1223 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Adrenergic innervation in rat renal capsule was demonstrated using the histochemical fluorescence method with glyoxylic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922341
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  • 5
    Electronic Resource
    Electronic Resource
    Immunohistochemical localization of gamma-aminobutyric acid (GABA) in the rat pancreas (1987)
    Springer
    Histochemistry and cell biology 86 (1987), S. 365-369 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The localization of gamma-aminobutyric acid (GABA) in rat pancreas was investigated using antiserum raised against GABA conjugated to bovine serum albumin with glutaraldehyde. Immunoreactive cells were only found in the center of the pancreatic islets, and these cells were surrounded by nonimmunoreactive cells. When two serial sections of rat pancreas were consecutively stained with GABA antiserum and with antibodies against insulin, both antisera stained the same population of endocrine cells within the islets. In rats pretreated with streptozotocin, a B-cell toxin, we observed a marked decrease in the number of cells exhibiting GABA-like immunoreactivity. These observations indicate that GABA is present in the B cells of rat pancreatic islets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00494994
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of workpiece vibration on planing noise (1979)
    Springer
    Wood science and technology 13 (1979), S. 301-309 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Effects of the workpiece surface vibration on planing noise were investigated theoretically and experimentally. A method of calculating the sound pressure level generated by the workpiece surface vibration due to the impact of planing knives was developed. Sound pressure levels and sound spectra calculated using this method show good agreement with measured values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356971
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    Paper (German National Licenses)
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