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  • 11
    Electronic Resource
    Electronic Resource
    Magnetic behavior of an array of cobalt nanowires (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5480-5482 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cobalt nanowires have been electrodeposited into the pores of Anodisc™ alumina membranes after placing on one side a layer of sputtered copper, which acts as electrode and substrate during the electrodeposition. Nanowires are 60 μm long, 170–220 nm in diameter depending on the size of the pores of the alumina membrane. This array of nanowires exhibits uniaxial magnetic anisotropy related to the particular shape of each individual nanowire. On the contrary to the expected behavior in a uniaxial magnetic system, the coercivity of the array exhibits a maximum when the applied field is in a perpendicular direction with respect to the easy axis. This magnetic behavior is analyzed considering dipolar interactions among nanowires, and the magnetization of the array is obtained as a function of the magnetic characteristics of each nanowire using an iterative method. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369868
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  • 12
    Electronic Resource
    Electronic Resource
    Matteucci and inverse Wiedemann effects in amorphous wires with enhanced circumferential domains (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5450-5452 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonmagnetostrictive CoFeSiB alloy wires were subjected to cold drawing processing followed by annealing under tension, in order to induce the formation of circular magnetic anisotropy. The axial (MZ–HZ) and circular (Mφ–Hφ) hysteresis loops indicate the existence of induced transverse anisotropy, with the magnitude of the anisotropy field being dependent on the processing conditions, while circular loops are quasibistable for samples processed under stress. Very peculiar hysteresis loops are obtained for the Matteucci (MI, Mφ–HZ) and inverse Wiedemann (IWE, MZ–Hφ) effects corresponding to those samples exhibiting the mentioned circular bistability. The circular shape of the MI loop is interpreted as produced by reversible magnetization rotation within circumferential domain. The effective hysteresis arises from the existence of a helical distribution of anisotropy in the transition region between the inner axial domain and the external shell. IWE loop confirms the presence of this helicity. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369972
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  • 13
    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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  • 14
    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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  • 15
    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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  • 16
    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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  • 17
    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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  • 18
    Electronic Resource
    Electronic Resource
    Bifurcations in highly magnetostrictive amorphous wires (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 9231-9235 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The aim is to correlate the magnetoelastic resonance phenomena in Fe-based amorphous wires with physics of bifurcations and chaos. The simultaneous application of a dc axial HZ and ac circular Hφ magnetic fields, with respect to the wire axis, gives rise to the appearance of nonlinear phenomena. The pickup signal, related with the time derivative of axial magnetization, is analyzed through Fourier analysis. For exciting frequencies ω much higher than the characteristic resonance value, it is possible to observe bifurcation behavior characterized by the appearance of signal contributions at a certain values of ω: ω/2, ω/4, ω/8, ω/16, ω/32,... . Such behavior is also checked through the determination of the phase space of the system. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362597
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  • 19
    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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  • 20
    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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