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  • 1
    Electronic Resource
    Electronic Resource
    Giant magneto-impedance effect in nanostructured magnetic wires (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1646-1654 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The giant magneto-impedance effect (GMI) is studied as a function of the structural modification induced in an Fe73.5Si13.5B9Cu1Nb3 amorphous alloy wire by annealing. The values of GMI are correlated to those structural changes and with the corresponding variation of the magnetic properties and intrinsic resistivity. Excellent soft magnetic properties, associated with low resistivity values, make this nanostructured material as one of the most promising for future applications of the GMI effect. The tailoring of the structure which can be induced by adequate thermal treatments easily allows one to obtain excellent combinations of circumferential permeability μφ and resistivity ρ during different devitrification stages, in order to produce materials for specific aims. Maximum GMI ratios of 200% are found after annealing the wires in the range 550–600 °C, where an optimum compromise between μφ and ρ is found. A simple model is developed correlating the fundamental physical properties of the soft magnetic wires with the measured values of both components of the impedance, allowing the prediction of experimental GMI ratios and an easy visualization of the phenomenon. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361009
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  • 2
    Electronic Resource
    Electronic Resource
    An alternative approach to giant magnetoimpedance phenomena in amorphous ferromagnetic wires (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5189-5191 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetoimpedance in as-cast, nonmagnetostrictive CoFeBSi amorphous ferromagnetic wires, submitted to an ac electric current of 5 mA in the frequency range 100 Hz–100 kHz, is analyzed in terms of equivalent circuits. It is shown that the equivalent circuit representing the wire frequency behavior can be approximated by a parallel LpRp arrangement with elements Rs and Ls in series; Lp and Rp are associated with circumferential domain wall permeability and wall damping, respectively; Ls is related to the circumferential rotational permeability of the wire, and Rs accounts for the dc resistance in the circuit. When the wire is submitted to a longitudinal dc field high enough to approach saturation (Hdc=3600 A/m), the circuit becomes simply a series RsLs circuit. The various contributions from basic magnetization processes to magnetoimpedance are discussed, as well as deviations from this idealized model. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359756
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  • 3
    Electronic Resource
    Electronic Resource
    Density of magnetic poles in amorphous ferromagnetic wires: An example of weak chaos : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5725-5727 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: While a single piece of Fe-base amorphous wire is well known to exhibit square hysteresis loop, it is experimentally shown here that when placing a set of n quasi-identical amorphous Fe-base wire its hysteresis loop consists of n large Barkhausen jumps separated by (n−1) horizontal stretches. This kind of loop is interpreted as arising from the magnetic interaction among wires. Each wire is considered to have a particular density of magnetic poles at the ends creating an additional field at its neighborhood. Such a density arises from the closure domain structure at the ends which is slightly modified after each reversal. These magnetic interactions are analyzed and proven to induce a weak chaotic behavior for the switching field of each single wire.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364649
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  • 4
    Electronic Resource
    Electronic Resource
    On the conduction band polarization in metallic systems with a periodic array of localized magnetic moments : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4815-4817 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the indirect exchange between magnetic moments distributed in a periodic array and carried out through the conduction band results from the balance of a ferromagnetic component, static effect, and an antiferromagnetic one, polarization effect. The sign of the coupling mainly depends on the density of states at the Fermi level. For filled bands only the antiferromagnetic component exists (metallic superexchange) and, in particular, only for free electrons both components exactly compensate to each other, remaining the typical Ruderman–Kittel–Kasuya–Yosida ripple due to the oscillating character of the polarization. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361617
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  • 5
    Electronic Resource
    Electronic Resource
    Torsional mode magnetoelastic resonance in ferromagnetic amorphous wire (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5819-5827 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A torsional pendulum has been built using a stress relieved FeSiB amorphous wire. Torsional motion is magnetoelastically induced by means of the simultaneous application of longitudinal Hz and circular Hφ magnetic fields. The experimental setup allows one to determine both the torsional deformation and the changes in the longitudinal magnetization Mz of the wire. Free and forced oscillations are observed depending on the parameters of the applied fields. In both forced and free oscillation modes two resonant peaks are observed. Their frequency and amplitude dependences on the axial Hz and circular fields Hφ have been studied. Changes in shear modulus ΔG valued 60% in excess have been measured. To interpret the experimental results a theoretical model is developed taking into account the existence of two different magnetic regions in the wire, core, and shell having a different distribution of axial, radial, and shear stresses. The calculations explain the more remarkable aspects of the observed behavior. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359161
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  • 6
    Electronic Resource
    Electronic Resource
    Bending stresses and bistable behavior in Fe-rich amorphous wire : 38th Annual Confrerence on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5791-5793 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The aim of this work is to analyze for the first time the changes in magnetic properties of an Fe-rich amorphous wire (Fe77.5Si7.5B15) when it is submitted to bending stresses. Upon a reduction of the radius of curvature, Rc, of the wire (i.e., increasing bending stresses), the main changes in the magnetic properties are summarized as follows: (a) Bistable behavior disappears when reducing Rc below about 11 cm but it is again observed for Rc less than about 2.5 cm. This latter effect is also obtained for short wires (less than around 7 cm) which do not show spontaneous bistability. (b) For the case when bending stresses make bistability disappear, the susceptibility increases more than one order of magnitude with regards to the case of bistable wire, and parallel to the increase of susceptibility, a reduction of remanent magnetization is observed. The disappearance and later occurrence of the bistable behavior with increasing bending stresses are discussed in terms of the tensile and compressive stresses induced when the sample is bent. The possibility of having bistable wires with toroidal symmetry is also discussed owing to its interest for particular applications as pulse generators with reduced size and magnetic switches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355564
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  • 7
    Electronic Resource
    Electronic Resource
    Creep-induced magnetic anisotropy in a Co-rich amorphous wire (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5343-5348 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic anisotropy of amorphous (Fe0.06Co0.94)72.5Si12.5B15 wire induced by current annealing under applied stress is investigated. The anisotropy constant is determined either from the axial or circular ac hysteresis loop, depending on the sign of the anisotropy constant. At low annealing temperatures and short annealing times weak easy-wire-axis anisotropy is observed. With increasing time and temperature of annealing hard-wire-axis anisotropy develops. Relaxation annealing without stress causes change of the sign of anisotropy constant. The induced anisotropy, however, is fully reversible indicating that plastic strain does not contribute to creep-induced magnetic anisotropy. A simple bond-orientational-anisotropy model, proposed to explain the observed behavior, assumes that competition between opposite contributions of two different kinds of excess atomic bonds is responsible for creep-induced anisotropy of this alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357187
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  • 8
    Electronic Resource
    Electronic Resource
    Extended x-ray-absorption fine-structure studies of heat-treated fcc-Fe50Cu50 powders processed via high-energy ball milling : 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. 6322-6324 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The local structure and chemistry of a ferromagnetic fcc-Fe50Cu50 solid solution obtained through high-energy ball milling were measured before and after heat-treatment-induced decomposition using extended x-ray-absorption fine-structure measurements. The decomposition is first evident with the phase separation of α-Fe after a heat treatment at 523 K. Analysis of the residual fcc component revealed that the Fe atoms were predominantly surrounded by other Fe atoms, suggesting that the Fe has coalesced within the fcc structure. The Fe atoms within the fcc phase likely exist in low-spin clusters which provide an explanation for the reduced values of low-temperature magnetization previously measured in annealed samples [P. Crespo et al., Phys. Rev. B 48, 7134 (1993)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358254
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  • 9
    Electronic Resource
    Electronic Resource
    Circumferential magnetization processes in CoFeBSi wires : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6539-6541 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The total impedance, Z, of low magnetostriction wires (Co0.94Fe0.06)72.5B15Si12.5 was measured at 100 kHz under ac currents of various amplitudes, i, for as-cast and current annealed samples. We show that curves Z vs i can represent circumferential permeability curves and that the features observed on these curves as a consequence of annealing can be interpreted due to the induced magnetic anisotropy by the effect of the current annealing. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361939
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  • 10
    Electronic Resource
    Electronic Resource
    A position sensor based on magnetoimpedance : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6549-6551 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magnetic-field sensor based on the giant magnetoimpedance phenomenon is presented. It is shown that a low, negative magnetostriction CoFeBSi amorphous wire can be used to detect the presence or passage of moving pieces or vehicles, simply by pasting a small permanent magnet on the vehicles/pieces. The detection is observed as a decrease in the ac voltage on the wire's ends. A system of such devices can be used to monitor and control a number of industrial processes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361943
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