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  • 1
    Electronic Resource
    Electronic Resource
    Stress dependence of the magnetization process in amorphous wires and ribbons (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2590-2595 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization processes in Fe75Si10B15 and (Co92.5Fe6.3Nb1)77.5Si7.5B15 amorphous wires were studied by measuring the stress dependence of the hysteresis loops as well of the pinning field. Disaccommodation measurements were also used to characterize quenched-in stresses and to study magnetization processes. The results were compared with those of ribbons with similar compositions. It is shown that the geometry of the samples (wires and ribbons) due to the different cooling conditions determines the different domain structures and consequently the magnetization process. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360118
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  • 2
    Electronic Resource
    Electronic Resource
    Giant magnetic viscosity in SmCo5−xCux alloys (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5157-5163 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hysteresis loops in SmCo5−xCux as-cast and annealed magnets (1〈x≤3) were measured at room temperature using a pulsed-field magnetometer and a static vibrating sample magnetometer. At field sweeps between 2 and 17 (GA/m)/s a giant—in this field range nearly constant—magnetic viscosity Sv was obtained. The viscosity is approximately proportional to the Cu concentration and to the coercive field. A heat treatment at 1273 K for three weeks changes the microstructure and enhances strongly the intensity and the time dependence of the coercivity. The decay of the inverse of the coercive field Hc with time follows a simple ln(t) relation between 10−5 and 10 s. Data analysis allows a density of stacking faults N to be extracted for each sample. Sv (and Hc) increases with N which increases with x. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371493
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  • 3
    Electronic Resource
    Electronic Resource
    Compositional evolution and magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 6008-6012 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Melt-spun FeCuNbSiB ribbons were annealed at 540–550 °C for various times (≤1 h). The development of a nanocrystalline structure was investigated by means of Mössbauer spectroscopy. From measured hyperfine fields and intensities the crystalline phase was inferred to be pure Fe1−xSix, with x=0.18 after 1 h annealing. The residual amorphous volume fraction was determined to be (approximately-equal-to)50%. With help of these results it has been possible to evaluate the amorphous contribution to magnetostriction in the nanocrystalline state. The development of a nanocrystalline structure was found to play a role in the main mechanisms of magnetic disaccommodation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350455
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  • 4
    Electronic Resource
    Electronic Resource
    A study of the aftereffect of the magnetic permeability in Co-rich amorphous ferromagnetic alloys (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3258-3262 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature measurements of saturation magnetization, saturation magnetostriction, and aftereffect of the magnetic permeability have been performed on a set of Co-based amorphous ferromagnetic alloys with magnetostriction values in the range −4×10−6 (approximately-less-than)λs(approximately-less-than)+1×10−6. The theoretical relation between aftereffect and λs has been verified to hold also in Co-rich amorphous alloys. The fraction of atoms participating in the ordering processes giving rise to the aftereffect is calculated to be of the order 10−4. The aftereffect is shown to be related, even in these alloys, to a damping of 180° Bloch walls, whose thickness increases with decreasing λs. The influence of the alloy's stability on the permeability aftereffect is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337714
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  • 5
    Electronic Resource
    Electronic Resource
    Study of frequency dependencies of the complex magnetic ac-permeability aftereffect in amorphous Fe64Co21B15 and Fe8Co77B15 alloys (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1581-1587 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The frequency dependencies of the complex magnetic permeability and its aftereffect phenomenon in as-cast and annealed Fe64Co21B15 and in as-cast Fe8Co77B15 amorphous ribbons were studied. The measurements of these properties were carried out at frequencies between 1 and 120 kHz. The behavior of the frequency dependence of real and imaginary parts of the ac permeability and aftereffect were analyzed using the magnetic domain wall motion model. A change of the restoring force coefficient and the damping parameter with time was considered for the study of frequency dependency of the magnetic relaxation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366869
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  • 6
    Electronic Resource
    Electronic Resource
    Suppression of the magnetic-permeability relaxation in nanocrystalline Fe73.5Cu1Nb3Si13.5B9 (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2454-2456 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature measurements of the reversible relaxation of the initial magnetic permeability have been performed in rapidly solidified Fe73.5Cu1Nb3Si13.5B9 ribbons at different stages of the transformation from the amorphous to the nanocrystalline phase. The intensity of the relaxation is observed to practically disappear in the nanocrystalline alloy. This result may modify the current views about the structural defects responsible for the magnetic-permeability relaxation in amorphous ferromagnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105993
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  • 7
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    Relief effects correction on frequency-domain electromagnetic data (2018)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2018
    Description: 〈span〉〈div〉ABSTRACT〈/div〉During a frequency-domain electromagnetic (FDEM) land survey using transmitter-receiver distances of kilometer order, the receiver and transmitter may be at different altitudes. To increase the signal-to-noise ratio, the transmitting coil size must be increased to the order of a hundred meters and its geometry will be determined by the terrain roughness. Therefore, the equivalent magnetic dipole axis may be neither vertical nor normal to the mean plane representing the terrain surface. Considering the perpendicular loop-loop arrangement, these factors modify the expected secondary magnetic field in two ways: (1) A horizontal primary field arises at the receiving coil position as well as (2) the secondary fields induced by the abnormal currents in the subsurface caused by the tilting of the transmitter dipole axis. A correction procedure is proposed to remove these effects on field FDEM data and tested by using simulated FDEM data with two- or three-layered tilted models to represent the earth with a dipping surface and a nonvertically oriented transmitter magnetic dipole representing a large coil laid on rough terrain. The results demonstrate that the proposed correction procedure has a limited effectiveness, but it can be applied to the FDEM data collected on terrain surfaces having small dipping angles. It is observed that maximum values of the transmitter dipole or surficial plane tilt angle should be 2° to ensure error values in the apparent conductivity less than 10%. Even for the said value, in some combinations of geometric and physical parameters, the tilting and dipping angles can be increased to the order of 5°.〈/span〉
    Print ISSN: 0016-8033
    Electronic ISSN: 1942-2156
    Topics: Geosciences , Physics
    Published by Society of Exploration Geophysicists (SEG)
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    PAPER CURRENT
  • 8
    Electronic Resource
    Electronic Resource
    Spin-valve transistor with an Fe/Au/Fe(001) base (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1157-1159 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A spin-valve transistor with an epitaxial Fe/Au/Fe(001) base was formed on n-GaAs, the characteristics of which were examined under a magnetic field for emitter voltages up to 3 V. The transfer ratio of the transistor, i.e., the ratio of collector-to-emitter current exceeded 10−3 at 3 V, preserving the magnet current ratio, i.e., the ratio of collector current in the parallel-to-antiparallel magnetic configuration well above 100%. It was suggested that the transfer ratio would be further enhanced by improving the flatness of the tunnel junction for injecting electrons from the emitter into the base, as well as by increasing the electron transmittance at the base/collector interface. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1397257
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  • 9
    Electronic Resource
    Electronic Resource
    Superconducting glass ceramics with Tc=100 K based on the Bi-Pb-Sr-Ca-Cu-O system (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1169-1171 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting glass ceramics of Bi0.8Pb0.2SrCaCu1.5Oy (sample A) and BiPb0.2SrCaCu1.5Oy (sample B) have been prepared by using the melt quenching method. It was found that the volume fraction of the high Tc phases in sample A annealed at 830 or 840 °C for 250 h was much higher than that in sample B. The annealed (840 °C, 250 h) sample A exhibited superconductivity with a Tc (zero) of 100 K and a critical current density (77 K, zero magnetic field) of 120 A/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101482
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation of Ag-coated superconducting Bi2Sr2CaCu2Ox glass-ceramic fibers (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 183-185 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Ag-coated superconducting Bi2 Sr2 CaCu2 Ox glass-ceramic fibers were successfully prepared. The glass fibers with a length of 50 cm, a width of 100–200 μm, and a thickness of about 20 μm were first drawn from glass plates with a thickness of 1 mm and then silver pastes were coated on the smooth surface of glass fibers. The Ag-coated glass fibers were converted into superconductors after annealing at temperatures of 820–860 °C. The main crystalline phase in the glass-ceramic fibers was the superconducting low Tc phase. The Ag-coated glass-ceramic fibers obtained by annealing at 840 °C for 5 h in air exhibited superconductivity with a Tc (zero)=70 K and a critical current density (60 K, zero magnetic field) of more than 40 A/cm2 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103978
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