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  • 1
    Electronic Resource
    Electronic Resource
    Evolution of coercivity during the early stages of Fe80B20 crystallization (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6920-6924 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a study of the evolution of coercivity (Hc) in partially crystallized Fe80B20 samples with an increasing number of crystallites obtained in a controlled way into ferromagnetic amorphous matrix. These samples allow to test existing models for interaction of domain walls with defects since it is possible to change only the number density of crystallites without modifying their dimensions. We observe that the evolution of Hc is mainly related to the nucleation frequency of grains and quite independent from their internal structure. The observed behavior of Hc can be accounted for by considering the dependence of coercivity on the number density of pinning sites and by assuming a two-dimensional bending of the domain walls during their motion. Moreover our results indicate that the changes occurring to the intergranular phase during annealing do not appreciably affect coercivity in the partially crystallized samples. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363765
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  • 2
    Electronic Resource
    Electronic Resource
    Bulk and surface magnetic study of Fe80B20 crystallization : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4643-4645 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a study relating the evolution of coercivity Hc, both in the bulk and in the surface region, to the microstructural changes occurring during the first stage of the crystallization process of Fe80B20 amorphous samples. The coercive field Hc has been studied with a magneto-optical Kerr ellipsometer in the surface and with a vibrating sample magnetometer in the bulk. The observed behavior of Hc can be accounted for by considering its dependence on the number density of grains and gives information on the domain wall dynamic indicating the occurrence of a two dimensional bending of the domain walls. In addition, the evolution of Hc is substantially insensitive to the details of the internal structure of the grains. This study reveals that the surface crystallization occurs via the same processes as in the bulk but it takes place at lower temperature with respect to the bulk. We also measured the Curie temperature of the surface region of the amorphous ribbon and we obtained a lower value with respect to the bulk. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365511
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructural characterization of Fe80B20 eutectic spherulites by small-angle neutron scattering and transmission electron microscopy (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2296-2301 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolution of the microstructure during the crystallization of amorphous Fe80B20 alloys has been investigated by small-angle neutron scattering (SANS) and transmission electron microscopy (TEM). Samples with an increasing degree of crystallization were obtained by performing different isothermal heat treatments on melt spun amorphous ribbons. The TEM measurements indicate that the crystallization occurs by nucleation and growth of Fe3B spherulites which include small finely divided α-Fe acicular crystallites. On the basis of the TEM results a model for the quantitative analysis of the SANS data has been formulated. The results show that, due to the high growth velocity of the nucleated particles, only their number increases with increasing annealing time, while their size and internal structure is not dependent on the degree of crystallization. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361154
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  • 4
    Electronic Resource
    Electronic Resource
    Grain-growth process during crystallization of Fe80B20 amorphous alloys (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6988-6989 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the full isothermal crystallization analysis of Fe80B20 amorphous alloy must include not only a crystal nucleation-and-growth process but also a grain-growth process and that these two processes are separated in time during isothermal annealing. The parameters characterizing the grain-growth process have been found by the fitting calorimetrical signal with the one expected from the normal grain-growth theory. Transmission electron microscopy and selected area electron diffraction seem to confirm our results since they show that there is a good agreement between the average grain radius of crystallization products seen in the micrograph and the one calculated from the obtained parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355051
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  • 5
    Electronic Resource
    Electronic Resource
    Surface crystallization and magnetic properties of amorphous Fe80B20 alloy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 6177-6180 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the effects of surface crystallization on the magnetic properties of Fe80B20 amorphous alloys. The surface magnetic properties have been studied with magneto-optic Kerr measurements, while those of bulk with a vibrating sample magnetometer. This study reveals that surface crystallization is similar to the bulk process but occurs at a lower temperature. At variance with previous results on other iron-based amorphous alloys the surface crystalline layer does not induce bulk magnetic hardening. Furthermore, both the remanence to saturation ratio and the bulk magnetic anisotropy do not show appreciable variations after the formation of the surface crystalline layer. The Curie temperature of the surface layer is lower with respect to the bulk of the sample. These effects can be explained by a lower boron concentration in the surface region of the as-cast amorphous alloy. Measurements of the chemical composition confirm a reduction of boron concentration in the surface region. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366502
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  • 6
    Electronic Resource
    Electronic Resource
    Fragmentation of cobalt layers in Co/Cu multilayers monitored by magnetic and magnetoresistive measurements (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3293-3295 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have monitored the structural evolution of Co(tCo)/Cu(4×tCo) multilayers when tCo ranges from 12 to 2 Å. The investigation has been performed by studying their magnetization and giant magnetoresistance, since these properties are complementary in providing information about the structure of the magnetic species into the samples. In particular, in the intermediate range of thickness, we observed no correspondence between magnetic and magnetoresistive behavior. Finally, at sufficiently low thickness, the samples exhibit noninteracting superparamagnetic features. This kind of evolution has been ascribed to the progressive fragmentation of Co layers. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1418023
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  • 7
    Electronic Resource
    Electronic Resource
    Role of particle size distribution on the temperature dependence of coercive field in sputtered Co/Cu granular films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2225-2227 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of coercive field and of the ratio between the remanent and saturation magnetization of granular Co/Cu films grown by sequential sputtering has been studied with magneto-optic Kerr effect measurements in the temperature range 8.5–60 K. The observed temperature dependence of coercive field does not fit any of the plausible Tx laws commonly used to describe systems of single-domain ferromagnetic particles. We worked out a generalized model, which also includes temperature effects related to nonuniform single-domain particle size distribution. The model predictions account well for the observed temperature behavior of both coercive field and ratio between the remanent and saturation magnetization. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1406986
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  • 8
    Electronic Resource
    Electronic Resource
    Low temperature magnetic properties of Fe"4"0Ni"4"0P"1"4B"6 amorphous ribbons
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 141-142 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90738-A
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic hyperfine field distribution and structural relaxation of amorphous (Fe"8"1"."5B"1"4"."5Si"4) prepared with different quenching rates
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 31-34 (1983), S. 1591-1593 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(83)91028-4
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  • 10
    Electronic Resource
    Electronic Resource
    Ferromagnetism of fcc iron films grown on nickel
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 66 (1987), S. 331-336 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(87)90166-1
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