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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Polarizing effects of magnetization on the crystallization of Co100−xPx amorphous alloys : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5372-5374 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented on the microstructure and magnetic properties of samples obtained by crystallization of amorphous films of composition Co100−xPx (10〈x〈25). Microstructural studies by means of scanning electron microscopy, x-ray diffractometry, as well as magnetic measurements showed the presence of a well-defined texture in the cobalt crystallites of samples of composition given by x〈21, the easy axis direction of the amorphous samples being preserved during the crystallization. In these samples the thermal dependence of the coercive and anisotropy fields and of the remanence was studied. The crystallization product of samples of composition given by x(approximately-greater-than)21 is characterized by the presence of cobalt crystallites with random easy axes distribution. The polarizing effect of the magnetization was evidenced through the correlation between the two different types of microstructure and the presence or absence of magnetic order during the crystallization of the samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353734
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Coercivity of Fe-SiO2 nanocomposite materials prepared by 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. 6573-6575 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Samples containing Fe nanoparticles dispersed in SiO2 were prepared by high energy ball milling. We have studied the variation with the milling time of both the saturation magnetization and the coercive force of these samples. The rapid increase of coercivity with the decrease of temperature observed in the low temperature range suggested the presence of superparamagnetic particles in the samples. Nevertheless, our experimental data were in poor agreement with the well-known T1/2 law describing the coercive force of superparamagnetic particles. Coercivities as high as 540 and 850 Oe were obtained for samples with x=0.3 at room temperature and at 1.7 K, respectively. From the analysis of the temperature dependence of the saturation magnetization the spin wave stiffness constant was obtained. This quantity evidenced the enhancement of the thermal demagnetization associated with the reduction in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358197
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic hardening by crystallization of amorphous precursors using very high heating rates : 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. 6840-6842 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of the treatment parameters of the coercivity of PrNdFeB samples prepared by crystallization of melt spun amorphous precursors is investigated. The crystallization treatments were carried out at high temperatures and using very high heating rates ("flash crystallization''). From the analysis of the temperature dependence of the critical field of the samples, it is concluded that this kind of crystallization treatment leads to very fine and homogeneous microstructures which result in a significant enhancement of the hard magnetic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358155
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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
    Mathematical modeling of a free-burning arc in the presence of metal vapor (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3065-3070 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transfer of energy between the plasma and the iron anode and the evaporation of metal were taken into account in modeling a short free-burning arc in argon at atmospheric pressure. The presence of metal vapor in the plasma modifies the electrical conductivity and the radiated power and leads to arc cooling in the anode region. In return, the arc cooling modifies the rate of vaporization of the anode and thus the calculated concentration of iron vapor in the arc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354624
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Modeling the influence of intergranular phases on the hysteretic behavior of hard magnetic polycrystals : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6943-6945 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have modeled, in the framework of a micromagnetic approximation, the field evolution of the configuration of magnetic moments induced by the occurrence of interfacial exchange coupling at grain boundary regions. The models describe hard ferromagnetic polycrystals where secondary intergranular phases are present. Depending on the paramagnetic or soft ferromagnetic nature of the secondary phases, on the exchange to anisotropy ratio of the main phase and on the intensity of the exchange coupling at the interfaces the reversal, from a remanence state, of the magnetization of a linear chain of magnetic moments perpendicular to the interface takes place for demagnetizing fields which vary from the anisotropy field of the hard phase (grains decoupled by a thick paramagnetic layer) down to tenths of that field (coupling through a soft layer). The dependence of these phenomena on the thickness of the intergranular phases has been also examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352442
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  • 10
    Electronic Resource
    Electronic Resource
    Optical energy-gap variation and deformation potentials in CuInTe2 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1451-1454 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Values of optical energy gap E0 as a function of pressure P up to 3 GPa at room temperature, and as a function of temperature T in the range 10–300 K at atmospheric pressure were obtained by optical-absorption measurements on samples of CuInTe2. It was shown that in this pressure range, E0 varies linearly with P, dE0/dP having a value of 2.2×10−2 eV/GPa. The variation of E0 with T was fitted well by a simple Manoogian–Leclerc equation of the form E0(0) − E0(T) = UT + Vcursive-phi (coth cursive-phi/2T−1). Both dE0/dP and U can be related to (dE0/dT)2, the lattice dilation contribution to the variation of the energy gap with temperature, and the values obtained in the two cases showed good agreement. The Vcursive-phi term can be related to (dE0/dT)1, the energy-gap variation due to electron-phonon interaction. From the values of (dE0/dT)1 and (dE0/dT)2, values were determined for the acoustic deformation potentials of the conduction band Ce and of the valence band Ch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349556
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