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  • 1
    Electronic Resource
    Electronic Resource
    Pinning fields in amorphous materials : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5727-5729 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stress and field dependence of the pinning field Hp of ribbons of the composition Fe73.5Cu1Nb3Si13.5B9 and Co73.5Cu1Nb3Si13.5B9 is compared with that of the coercivity HC. The similar character of HC(σ) and Hp(σ) indicates a strong correlation between these two properties. At higher external stresses HC(σ) and Hp(σ) depend on a premagnetizing procedure. This can be explained assuming a different domain structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353605
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of quenching rate on magnetic properties of amorphous ribbons : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6603-6605 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Five sets of amorphous ribbons of the composition Fe73.5Cu1Nb3Si13.5B9 produced with different quenching rates (QR) were studied in order to verify the influence of the topological disorder on magnetic properties. For this purpose several magnetic methods were applied. Significant differences have been found between the results of magnetic disaccommodation He⋅Δμ/μ, pinning field Hp and stress dependence of the magnetic permeability μ/μ0(σ) of as-cast materials produced at different QR. The values of He⋅Δμ/μ and Hp are directly proportional to the disorder degree of the samples. The μ/μ0(σ) curves display broad maxima, which are found to be related to the quenched-in stresses. In contrast with these results, no significant effects of the amorphous structure on the Curie temperature and Mössbauer spectra were found, because other parameters are dominating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352578
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  • 3
    Electronic Resource
    Electronic Resource
    Compositional evolution and magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 6008-6012 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Melt-spun FeCuNbSiB ribbons were annealed at 540–550 °C for various times (≤1 h). The development of a nanocrystalline structure was investigated by means of Mössbauer spectroscopy. From measured hyperfine fields and intensities the crystalline phase was inferred to be pure Fe1−xSix, with x=0.18 after 1 h annealing. The residual amorphous volume fraction was determined to be (approximately-equal-to)50%. With help of these results it has been possible to evaluate the amorphous contribution to magnetostriction in the nanocrystalline state. The development of a nanocrystalline structure was found to play a role in the main mechanisms of magnetic disaccommodation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350455
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  • 4
    Electronic Resource
    Electronic Resource
    Precipitation and dissolution of Co granules in CuCo alloys: Reverse effects of Joule heating (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 7170-7178 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of resistance R versus electrical current I were performed during annealing of melt-spun pure Cu and Cu90Co10 ribbons using linearly varying current Joule heating. Typical results of Cu90Co10 samples show three characteristic stages. For low applied currents (I〈4.0 A), a metallic behavior is observed and compared with pure Cu samples. Precipitation is the dominant process for intermediate currents (5.0 A〈I〈9.0 A). Re-solution of precipitated Co back to Cu matrix appears for high current values (I〉9.0 A). Competition between precipitation and dissolution of Co granules depends also on the cooling rates, and we observed that it is possible to freeze high temperature off-equilibrium configurations down to room temperature after an appropriate quenching. Experimental annealing conditions were simulated using the Monte Carlo–Metropolis method, with Kawasaki dynamics of diffusing atoms, to study the kinetics of transformations in the Cu–Co system. Simulations show that precipitation and re-solution competition occurs as functions of both temperature and time. A relationship between simulated Co atoms configuration and resistance measurements is made © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371808
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of Joule heating on magnetostriction and giant magnetoimpedance effect in a glass covered CoFeSiB microwire (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5435-5437 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of annealing parameters (time ta, current Ia, and applied stress σa) on magnetic properties of Joule heated amorphous Co68.15Fe4.35Si12.5B15 glass covered microwire (13 μm) was investigated. Annealing under applied stress induces additional anisotropy which is proportional to σa and can be removed by subsequent heating without stress. The magnetoimpedance, measured on the sample with the lowest anisotropy field (HK(approximate)120 Am−1), shows sharp maxima at H=±HK. For driving currents higher than 0.2 mA nonlinear behavior is observed, and the magnitude of giant magnetoimpedance significantly decreases. The maximum relative change of impedance (60%), observed for the highest frequency, 900 kHz, compares well with the values reported on conventional wires. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369967
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties and giant magnetoresistance in melt-spun Co-Cu alloys (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 392-397 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic, structural, and transport properties of as-quenched and annealed Co10Cu90 samples have been investigated using x-ray diffraction and a SQUID magnetometer. The largest value of MR change was observed for the as-quenched sample annealed at 450 °C for 30 min. The magnetic and transport properties closely correlate with the microstructure, mainly with Co magnetic particle size and its distribution. For thermal annealing the as-quenched samples below 600 °C, the Co particle diameters increase from 4.0 to 6.0 nm with a magnetoresistance (MR) drop from 33.0% to 5.0% at 10 K. Comparison with the theory indicates that the interfacial electron spin-dependent scattering mechanism correlates with GMR for Co particle diameters up to about 6.0 nm. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360613
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  • 7
    Electronic Resource
    Electronic Resource
    Resonant microwave cavity response of amorphous 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. 5462-5464 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this study we report microwave experiments on the amorphous ribbon Fe4.6Co70.4Si15B10 using the usual setup for magnetic resonance experiments at 9.4 GHz to observe the cavity response. Several samples cut from the same tape were annealed, either in the presence or in the absence of a magnetic field. For each sample the magnetization and magnetoimpedance (MI) curves were obtained, with MI ratios between 1% and 40%. The magnetic resonance spectrum consists of the usual ferromagnetic line and an anomalous low field cavity response for H〈100 Oe. The shape of this low field signal depends on the thermal treatment and on the orientation of the external field. We believe that this signal is in part a ferromagnetic peak but it also carries information of the skin-depth changes with a sweeping magnetic field. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362273
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  • 8
    Electronic Resource
    Electronic Resource
    Structure, magnetic properties, and giant magnetoresistance in melt-spun metallic copper–cobalt ribbons (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1979-1990 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a comprehensive investigation of structural, magnetic, and transport properties of as-quenched and annealed CoxCu1−x (0≤x≤0.20) granular alloys prepared by melt spinning. Using x-ray diffraction, differential scanning calorimetry measurements, and magnetic characterization, we have uncovered a Co phase separation process which results in the variation of magnetic and transport properties of Co–Cu heterogeneous alloys. In the Co composition range (0≤x≤0.15), the maximum giant magnetoresistance (GMR) was observed for CoCu samples annealed at 450 °C for 30 min, where Co particle diameters are in the range of 3.5–4.5 nm. The variation of magnetic and transport properties with the concentration and size of precipitated Co clusters is discussed, and is consistent with the prediction of the two-channel model, in which spin-dependent scattering is dominated by the cluster-matrix interfaces. The reduction of GMR in high Co concentration is attributed to the appearance of magnetic coupling among magnetic particles. In contrast, very small particles tend to behave superparamagnetically, resulting in the reduction of the ratio of spin-dependent scattering to spin-independent scattering potentials, and thus in the reduction of the GMR effect. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361049
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties and giant magnetoresistance of magnetic granular Co10Cu90 alloys obtained by direct-current joule heating (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5062-5066 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The direct-current (dc) joule heating technique was exploited to fabricate giant magnetoresistance (GMR) Co10Cu90 granular alloys. The Co cluster precipitation process was investigated by calorimetric and x-ray diffraction measurements. At T=10 K, the largest MR change of 25.0% has been observed for the melt-spun Co10Cu90 ribbon annealed at I=5 A. The magnetoresistance scales approximately as the inverse Co particle size. At room temperature, it was found that the dc joule-heated samples show relatively high GMR in comparison with furnace-annealed samples. Based on the phenomenological GMR model, we assumed that it is a consequence of smaller Co particles formed in dc joule-heated samples. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359735
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