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  • 1
    Electronic Resource
    Electronic Resource
    Coercivity and remanence of amorphous and nanocrystalline Fe–(Cu,Ta)–SiB ribbons : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5465-5467 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the evolution, with the thermal treatment parameters, of the remanence and coercive force of amorphous melt spun ribbons having compositions of Fe77.5Si13.5B9, Fe76.5Cu1Si13.5B9, and Fe74.5Ta3Si13.5B9. The thermal treatments were carried out by using the current annealing technique with and without the simultaneous application of a tensile stress along the axis of the samples. Our results show that upon low temperature (low current), short time treatments both the remanence and the coercive force are basically determined by the characteristics of the effective anisotropy induced during the treatment. In contrast, high temperature (high current) treatments result in values of both quantities that are linked to the (partial or total) accomplishment of the first stage of the crystallization process of the samples. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362274
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of applied torsion on the bistable behavior of CoSiB amorphous wire : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6315-6317 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results are reported on the torsion dependence of bistability of CoSiB amorphous alloys. Switching field and remanence magnetization are measured with applied torsion up to 20π rad/m for as-quenched wire as well as for stress-annealed wire, with and without preannealing. Measurements are performed both for Mz-Hz and Mz-Hφ hysteresis loop. The results show that the bistability of Co-rich amorphous wire strongly depends on the torsion-induced helical anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355384
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  • 3
    Electronic Resource
    Electronic Resource
    Stress induced anisotropy and temperature dependence of the magnetostriction in Fe73.5Cu1Nb3Si13.5B9 amorphous alloy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3323-3327 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic anisotropy, Kσ, induced by heating under applied tensile stress has been studied for the Fe73.5Cu1Nb3Si13.5B9 amorphous alloy as a function of the annealing temperature. The induction process was carried out by means of current annealing in samples as-quenched and preannealed (TP.A.=400 °C during 2 min). It is found that the easy axis of this anisotropy is transverse to the tensile stress. The dependence of the stress induced anisotropy on annealing temperature is, in both cases, similar to that reported in other different metallic glasses when annealing at temperature below Tc=350 °C, while Kσ is practically constant (≈500 J m−3) in the annealing temperature range from 350 to 525 °C. On the other hand, the magnetostriction constant, λs, was determined as a function of the measuring temperature within the range from 4.2 K up to 600 K. The results can be well accounted for by the single-ion model up to 350 K, while above this temperature the contribution of two-ion mechnism is also inferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354556
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  • 4
    Electronic Resource
    Electronic Resource
    Stress annealing in Fe73.5Cu1Ta3Si13.5B9 amorphous alloy: Induced magnetic anisotropy and variation of the magnetostriction constant (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1131-1134 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Joule heating anneals, carried out with the simultaneous application of a mechanical stress (stress-current annealing), on the anisotropy and magnetostriction of Fe73.5Cu1Ta3Si13.5B9 amorphous samples is investigated. As a result of these thermal treatments an uniaxial in-plane magnetic anisotropy, characterized by the constant Kσ, was induced in the samples. The dependence of Kσ on the annealing temperature shows a maximum around 450 °C which can be connected to the first stages of the crystallization process. From the measurement of the stress dependence of the magnetization work Wm, the magnetostriction constant λs of the as-quenched and thermally treated samples was also evaluated. The results obtained show how the presence of two phases in the partially crystallized material determines the magnetoelastic behavior of these samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357834
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Influence of the applied tensile stress on the magnetic properties of current annealed amorphous wires : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6522-6524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of the magnetic parameters as switching field H*, coercive field Hc and reduced remanence mr, on applied tensile stress σa has been studied in current annealed amorphous wires. The switching field increases as σ 1/2a in fully relaxed samples, while in both "as-quenched'' and partially relaxed samples the σ 1/2a law holds only at high values of σa. The coercive field increases with σa in a way similar to H* and mr increases up to the saturation value. This behavior can be explained by taking into account the different magnetic regions that have been proposed for these wires.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349894
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  • 7
    Electronic Resource
    Electronic Resource
    Asymmetric torsion stress giant magnetoimpedance in nearly zero magnetostrictive amorphous wires (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4813-4815 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of the torsion strain on the electrical impedance in (Co0.95Fe0.05)72.5Si12.5B15 amorphous wire has been investigated. The torsion stress impedance ratio, defined as (ΔZ/Z)ξ=[(Z(ξ)−Z(ξmax)]/Z(ξmax), has an asymmetric character with a broad maximum at around 20 rad/m. After Joule heating without torsion (ΔZ/Z)ξ has a tendency to achieve finally a sharp and nearly symmetric shape. Maximum changes of (ΔZ/Z)ξ, of 270% is obtained after optimal conditions of current annealing. Besides, GMI ratio, (ΔZ/Z)H=[(Z(H)−Z(Hmax)]/Z(Hmax) can be significantly improved too reaching 350% in the particular case of current annealing at 550 mA for 0.5 min. The asymmetry of the (ΔZ/Z)ξ in the as-cast state and after torsion annealing could be ascribed to the spontaneous or induced helical anisotropy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373168
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  • 8
    Electronic Resource
    Electronic Resource
    Induced magnetic anisotropy in Co–Mn–Si–B amorphous microwires (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1402-1409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of both thermal treatments as well as chemical etching treatments on the magnetic behavior has been investigated in nearly-zero magnetostriction glass-coated amorphous (Co1−xMnx)75Si10B15 (x=0.08, 0.09, and 0.10) microwires. Such a small change in x results in rather strong changes in the hysteresis loop parameters including coercitivity, Hc, and initial magnetic permeability, μ15. This effect was ascribed to the change of sign of the magnetostriction constant with a proper combination of the coercivity and relatively high initial permeability for the as-cast x=0.09 sample. Thermal treatment (temperatures 100–200 °C for 0.5–2 h) as well as chemical etching in 20% diluted fluoridric acid with duration from 0.5 up to 50 min modify this magnetic parameters owing to the internal stresses relaxation process. In particular, annealing under applied magnetic field (field annealing) can improve more significantly these magnetic parameters: increasing both Hc and μ15. Such phenomenology can be interpreted considering the noticeable longitudinal magnetic anisotropy induced by the combined effects of the magnetic field and strong internal stresses arising from the coating during the thermal treatment. The reduction of the glass coating thickness by chemical etching leads to a decrease of the internal stresses from a coating and, consequently, to a decrease of the transverse magnetoelastic anisotropy. Such decrease of anisotropy plays a role similar to that induced by field annealing on the hysteretic behavior. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372063
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  • 9
    Electronic Resource
    Electronic Resource
    Steady state oxygen surface content in oxygen sputtered silicon at impact energy of 5 keV per atom (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 4456-4466 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method is presented for the calculation of the oxygen surface concentration in steady state when sputtering silicon and silicon oxides with oxygen ions. The case of sputtering with 5 keV oxygen atoms as a function of incidence angle has been studied. Measurements of erosion rates under the mentioned sputtering conditions, including oxygen and noble gases as primary ions, with and without oxygen flooding, are the input data. The dependence of the component sputtering yield of silicon on the oxygen surface concentration is also obtained, as well as the preferential sputtering ratio. These quantities, from the point of view of the calculation work frame, depend on the degree of oxygen supersaturation (oxygen atomic fraction 〉2/3) at the surface in normal incidence. The possibility of supersaturation is a result of our assumptions and its level can be estimated within a narrow range. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1408589
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of the Cu and Nb additives on the effective magnetic anisotropy in FeSiB alloys : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4646-4648 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented on the evolution according to the thermal treatment parameters of the effective anisotropy and the dispersion field of two amorphous melt-spun samples having nominal compositions Fe74.5Nb3Si13.5B9 and Fe76.5Cu1Si13.5B9, respectively. From these data we conclude that the softening of the samples prepared by nanocrystallization annealings is closely linked to the particularities of the devitrification processes of the two considered alloys. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365512
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