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  • 1
    Electronic Resource
    Electronic Resource
    Giant Barkhausen effects with second order instability (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5378-5378 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Idealized giant Barkhausen (BG) jumps in amorphous wires result in a simple rectangular hysteresis loop. There is a range of domain wall depinning fields so that if the depinning field for magnetization in the central section of the wire is high enough, magnetization reversal takes place by domains becoming depinned at the end of the wire. This leads to the rectangular hysteresis loop characteristic of GB. We have observed a different kind of Barkhausen effect in Fe-B-Si amorphous wires under a variety of conditions. The magnetization starts linearly with field, then displays a roughly quadratic field dependence, saturating at lower fields than that given by the low field linear extrapolation. In the quadratic region the plot of log(Hs−H) vs log(Ms−M), where Hs is the apparent saturation magnetization taking place at field Hs, is linear with a slope of 1/2. This is typical of simple second order instability processes. Thus, instead of a first order giant Barkhausen jump we have observed a second order Barkhausen process that is continuous. The only jump that occurs is in demagnetizing. This is caused by hysteresis. We believe this is the first time that this second order process has been described. From the details of the measurement we believe that the magnetization takes place by a longitudinal wall moving radially rather than a radial wall moving longitudinally as in the GB. The circumstances under which this takes place are in well-annealed wires magnetized with an imposed twist and longitudinal stress. In as-cast wires we imposed a curvature by bending along the longitudinal axis. The solenoid of the exciting field is bent the same way. The magnetization in wires with the imposed curvature displays a GB behavior for high and low curvatures. In an intermediate regime of curvature a behavior midway between GB and our second order effect is displayed. The low field magnetization looks like the second order effect but has a small jump to apparent saturation in the quadratic region described above. In summary we have found a range of depinning fields that lead to different magnetization processes when the depinning field values are less than that for central magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353736
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  • 2
    Electronic Resource
    Electronic Resource
    Demagnetizing effect for conducting disks and their conductivity determination from ac susceptibility : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6852-6854 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An eddy-current technique for determining conductivity of disks from complex ac susceptibility measurements is developed. Different from most other techniques, this technique can be used for both nonmagnetic and magnetic materials since there is a magnetic correction factor in the formula obtained from eddy-current and demagnetizing effect analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352460
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  • 3
    Electronic Resource
    Electronic Resource
    Demagnetizing factors of long cylinders with infinite susceptibility (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3413-3415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simple analytic formulas are proposed, that provide a close approximation to the fluxmetric and magnetometric demagnetizing factors of long cylinders with infinite susceptibility as functions of aspect ratio. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1351537
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  • 4
    Electronic Resource
    Electronic Resource
    Susceptibility spectrum of a magnetic conducting sphere (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3044-3045 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The frequency dependence of the complex ac susceptibility of a magnetic conducting sphere is derived. The resultant formulas can be used to determine electrical conductivity from ac susceptibility measurements, to calculate ac susceptibilities of standard samples for the calibration of ac susceptometers, and to analyze ac losses in materials research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144605
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: "Exponential critical-state model for magnetization of hard superconductors'' [J. Appl. Phys. 67, 3430 (1990)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1017-1017 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365547
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  • 6
    Electronic Resource
    Electronic Resource
    Lower critical field and surface barrier in sintered Bi2Sr2CaCu2O8+δ superconductor (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2578-2583 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The saturated magnetization curves of a sintered Bi2Sr2CaCu2O8+δ superconductor are measured at different temperatures below Tc. The data are fitted by an extended critical-state model, so that the lower critical field, Hc1, and the first field for vortex entry, H1, are obtained. With decreasing temperature, Hc1 increases almost linearly whereas H1(approximately-greater-than)Hc1 below 50 K. Above 50 K, Bean–Livingston surface barriers disappear and the M(H) curves show anomalies that suggest that the critical-state model is not valid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356232
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  • 7
    Electronic Resource
    Electronic Resource
    Nonuniform domain magnetization in CoFeSiB amorphous ribbons : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4072-4074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The low field ac susceptibility, χ=χ′−jχ′′, and domain structures of as-cast, stress relieved, and field annealed CoFeSiB amorphous ribbons are studied in the remanence state. An eddy current loss analysis is made based on a model which combines the contributions of domain wall displacements (DWD) and domain magnetization rotations (DMR). It is found that although having similar longitudinal bar domain structures, χ of the field annealed ribbon is due to DWD, but it is dominated by DMR for the first two, which indicates a nonuniform magnetization in the domains. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365081
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  • 8
    Electronic Resource
    Electronic Resource
    Transverse demagnetizing factors of long rectangular bars: I. Analytical expressions for extreme values of susceptibility (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5254-5259 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The demagnetizing problem should be studied numerically in nonellipsoids with nonzero susceptibility χ, except for a few limiting cases where analytical treatment turns out to be practical. In this work, for an infinitely long bar with rectangular cross section 2a×2b and χ=∞ and −1 in a uniform transverse applied field Ha along dimension a or b, analytical expressions for the surface pole or current distributions and the fluxmetric and magnetometric demagnetizing factors Nf,m are derived using a technique of conformal transformation. From the new as well as the existing formulas, Nf,m(χ=∞,0,−1) are evaluated, plotted, and tabulated as functions of a/b. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1459745
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic susceptibility of sintered and powdered Y-Ba-Cu-O (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 980-983 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The real and imaginary parts of ac susceptibility of a sintered Y1Ba2Cu3O7−δ superconductor were measured before and after powdering. The temperature-dependent susceptibility may be separated into two contributions, one sensitive and the other relatively insensitive to the magnitude of the measuring field. The former is partially suppressed by coarsely crushing the sample. It is completely suppressed after finely powdering, whereupon the susceptibility curves become insensitive to the magnitude of the measuring field. Several models apparently consistent with the results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340050
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  • 10
    Electronic Resource
    Electronic Resource
    Induced anisotropy and magnetostriction in metallic glasses (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3781-3783 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the saturation magnetostriction in (Fe,Co,Ni)-based metallic glasses can be explained rather satisfactorily in terms of contributions arising from single-ion and two-ion local magnetic anisotropy. The temperature dependence of the induced anisotropy, however, is found to be different. It is observed that induced anisotropy of Co-rich alloys originates mostly from single-ion contribution, while in the case of Fe-Ni-based alloys two-ion contribution seems to be the origin. Effects of annealing reveal a much more complicated situation. We suggest that these results can be interpreted in terms of the kinetics of local orientation and their general distribution on a macroscopic scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338644
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