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  • 1990-1994  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of FeSi-SiO2 granular films : 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. 6490-6492 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ferromagnetic resonance (FMR) spectra and coercivities of FeSi-SiO2 granular films have been measured over a wide range of FeSi volume fractions (fv). The films were prepared using the ion-beam sputtering technique and transmission electron microscopy showed that the FeSi alloy granules are embedded in a matrix of SiO2. An enhanced coercivity (Hc), as high as 329 Oe at room temperature, is observed. For some samples, there are several resonance peaks in the FMR spectra, which include one major peak and several minor peaks. The major and minor peaks correspond to the usual uniform mode and spin-wave respectively. In our experiments, the field separations between the major and the minor peaks show a complex fashion. Our results are discussed in comparison with some theoretical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358235
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of heat treatment on the structure and magnetic properties of sputtered BaCoTiFe10O19 films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 3404-3406 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: BaCoTiFe10O19 films were prepared by sputtering. The as-sputtered films are amorphus and have a magnetization of 5 emu/cm3 and a coercivity of 700 Oe at room temperature. Compared with bulk BaCoTiFe10O19 hexaferrites, the magnetization is much smaller, but the coercivity is higher. After annealing at about 750 °C in an oxygen atmosphere, the films crystallize into an M-type hexagonal ferrite with a preferred orientation of the (110) plane being parallel to the film surface. The magnetization increases rapidly to 320 emu/cm3, but the coercivity decreases to 100 Oe. The amorphous samples with a large amount of Fe3+ ions show no ferromagnetic magnetic resonance spectra. After crystallization a well-defined ferromagnetic resonance spectrum occurs. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112407
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropy and Faraday effect in Co spinel ferrite films : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7099-7101 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystalline Co spinel ferrite films were prepared by rf sputtering on glass substrates without buffer layer and annealed at temperatures from 400 to 600 °C for 2 h in air. (100) texture was obtained in these films. The anisotropy constant, magnetic hysteresis loops, and magneto-optical Faraday spectra of the films were measured. The texture became poor when the films were annealed below 500 °C, but the perpendicular anisotropy constant Ku, squareness ratio R=(Mr/Ms)⊥/(Mr/Ms)(parallel) increased and showed peak values of 2.2×105 ergs/cm3 and 0.94, respectively, at an annealing temperature Ta=500 °C. For the film annealed at 600 °C (higher than the Curie temperature, 520 °C, of Co spinel ferrite), the texture recovered, but Ku and R dropped. The Faraday rotation spectra of Co spinel ferrite films showed a broad peak centered around 720 nm. The peak value increased monotonically with increasing annealing temperature. These results may be related to the Co ion-induced anisotropy and Co ion distribution in tetrahedral sites and octahedral sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356741
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  • 4
    Electronic Resource
    Electronic Resource
    Modulated photoreflectance characterization of ion-implanted semiconductor wafers (1994)
    Springer
    Applied physics 58 (1994), S. 441-445 
    Details
    ISSN: 1432-0630
    Keywords: 78.50.−w ; 71.55.−i ; 78.65.−s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Modulated PhotoReflectance (MPR) measurements on semiconductor wafers implanted with boron or silicon ions in the dose range 5×1010–5×1015 ions/cm2 are presented. Correspondingly, a one-dimensional theoretical multilayer model is established. In the theory, as the implant dose is lower than a critical value, the variation of the MPR signal is contributed mainly by the implanted defects and damages. However, when the dose is above the critical dose, the change of the MPR signal is chiefly due to the formation and growth of an amorphous layer. The theoretical results are in good agreement with those of experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332434
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental study of laser-generated shear waves using interferometry (1990)
    Springer
    Research in nondestructive evaluation 2 (1990), S. 143-155 
    Details
    ISSN: 1432-2110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The shear displacements generated by short laser pulses have been measured in aluminum semicylindrical samples, both in the thermoelastic and ablation regimes. We measured the waveforms at different angles and obtained the angular distribution pattern of the amplitudes. For the thermoelastic regime good agreement has been found between the measured and the theoretically predicted shear waveforms. In the ablation regime, the absolute values of the amplitudes are comparable to the ones of compressional waves. The shear waveforms are difficult to interpret, particularly in the case where both thermoelastic and ablative effects play a role, because the phases of the shear pulses are opposite to one another in these two regimes. To measure the in-plane displacements, and hence the shear displacement field generated by the pulsed laser, a speckle heterodyne interferometer was used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01606354
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  • 6
    Electronic Resource
    Electronic Resource
    Creep effect on dynamic visco-elastic properties of polymer matrix composite (1994)
    Springer
    Applied composite materials 1 (1994), S. 125-133 
    Details
    ISSN: 1573-4897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper deals with the creep effect on dynamic visco-elastic properties of short fibre reinforced polymer SMC composite. The vibration-creep-vibration test procedure was applied to examine the influence of creep on dynamic modulus E and loss tangent tgδ of the material. The results show that creep causes appreciable influence on E and tgδ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567574
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Structure-property relationship of wood in East-Liaoning oak (1992)
    Springer
    Wood science and technology 26 (1992), S. 139-149 
    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 Relationships between various anatomical parameters and selected physico-mechanical properties of wood were examined statistically in East-Liaoning Oak. Path analysis revealed that the key anatomical factors influencing wood shrinkage vary with the type of shrinkage: both radial and tangential shrinkage are mainly controlled by fiber diameter, differential shrinkage mainly by microfibrillar angle and volumetric shrinkage by tissue proportions; specific gravity is determined directly by percentage of cell wall material, while the percentage, in turn, is closely related to tissue proportions, among which vessel proportion is the most important; tensile strength is closely related to microfibrillar angle and specific gravity is not always a good estimator of strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194469
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    Paper (German National Licenses)
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