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  • 1
    Electronic Resource
    Electronic Resource
    Comparison between disaccommodation and ferromagnetic resonance measurements in polycrystalline nickel ferrites (1995)
    Springer
    Applied physics 60 (1995), S. 303-307 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 76.50; 75.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. FerroMagnetic Resonance (FMR) measurements of polycrystalline nickel ferrites at 11 GHz from 77 to 400 K have been carried out. The different contributions to the FMR linewidth have been studied by a computational technique based on the parameters previously obtained for single-crystal nickel ferrite. A new qualitative comparison between the FMR and disaccommodation measurements by means of the induced anisotropy formalism is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538408
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison between disaccommodation and ferromagnetic resonance measurements in polycrystalline nickel ferrites (1995)
    Springer
    Applied physics 60 (1995), S. 303-307 
    Details
    ISSN: 1432-0630
    Keywords: 76.50 ; 75.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract FerroMagnetic Resonance (FMR) measurements of polycrystalline nickel ferrites at 11 GHz from 77 to 400 K have been carried out. The different contributions to the FMR linewidth have been studied by a computational technique based on the parameters previously obtained for single-crystal nickel ferrite. A new qualitative comparison between the FMR and disac-commodation measurements by means of the induced anisotropy formalism is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538408
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  • 3
    Electronic Resource
    Electronic Resource
    The dilution of silica in a NiZnCo spinel ferrite matrix (1996)
    Springer
    Applied physics 63 (1996), S. 453-459 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 75.60E; 75.60L; 82.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Silica may dissolve up to about 0.05 wt% in an iron excess NiZnCo spinel matrix, affecting noticeably the magnetic properties at low and high values of the applied field. The initial permeability is reduced by about 50% with the addition of only 0.1% SiO2, while the coercivity almost triples, without noticeable changes in porosity or grain distribution. The vacancy and Fe2+ content of the sintered material also show a considerable change. The energy associated to the transformation Fe3+→Fe2+ for the samples without SiO2 was found to be 0.41–0.42 eV, while for the samples with SiO2 additions it decreased to 0.26 eV. The changes in magnetic properties are thought to be caused, more than because of the mentioned changes in ion distribution, by the stresses and defects created in the lattice due to the very small size of the Si4+ ion, which substitutes Fe3+ ions in tetrahedral sites. The transition Fe3+→Fe2+ seems to take place exclusively in the octahedral sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571673
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  • 4
    Electronic Resource
    Electronic Resource
    Study of the frequency dependence of the ferromagnetic resonance linewidths of nickel ferrites from 8–60 GHz : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5422-5424 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this communication we present in a systematic way experimental data on ferromagnetic resonance (FMR) linewidths of polycrystalline nickel ferrites (NixFe3−xO4 with 0.8〈×〈1.5) from 8 to 12.4 GHz and from 26.5 to 60 GHz. Data from 26.5 to 60 GHz were taken at room temperature while measurements at X band have been carried out from 77 to 400 K. Neither in X band nor from 26.5 to 60 GHz was a clear frequency dependence found. Classical contributions to the FMR linewidth according to Sparks' outline are analyzed in the whole range of frequencies from 8 to 60 GHz. Contributions of the porosity, anisotropy, slowly and rapidly relaxing impurities, valence exchange and eddy current mechanisms are considered. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362326
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison between disaccommodation and ferromagnetic resonance measurements in polycrystalline yttrium–iron–garnet samples : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5436-5438 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline yttrium–iron–garnet (YIG) samples were sintered in air at temperatures ranging from 1350 to 1450 °C. Ferromagnetic resonance measurements have been accomplished at 11 GHz from 77 to 350 K. The different contributions to the linewidth have been analyzed. These results are compared with previous measurements of magnetic disaccommodation in the same samples. A qualitative relationship between both kind of measurements for polycrystalline YIG samples by means of an induced anisotropy formalism is provided. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362331
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  • 6
    Electronic Resource
    Electronic Resource
    Field dependence of magnetic relaxation in BiPbSrCaCuO superconductors : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6574-6576 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic relaxation in ceramic cylindrical samples of BiPbSrCaCuO high Tc superconductors has been studied as a function of applied magnetic field for a constant decay rate of that field strength. We have analyzed the variation of the ac susceptibility versus time just after removing the magnetic field. Data have been obtained by means of an inductive technique from 1 to 3600 s, with magnetic fields that range from 10 to 100 Oe, and by switching off the field at a constant rate of 25 Oe/s. The field dependence of the thermally activated parameters has been obtained within the framework of the Anderson–Kim theory and using the so-called box distribution of energies. Anderson–Kim considered a logarithmic decay of the magnetic flux governed by an effective energy U=U0−FVX, where U0 is the pinning energy, V is the activation volume, X the pinning length, and F the driving force density. In this case we have found a field dependence of the form H−n for the pinning energy, with n close to 2 and temperature dependent. However, we have observed that the box distribution, which assumes the existence of a continuous energy spectrum, shows no field dependence for the effective energy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361949
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of the magnetic relaxation in BiPbSrCaCuO high-TC superconductors by means of an interaction model (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6055-6057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic relaxation of cylindrical polycrystalline samples of BiPbSrCaCuO high-TC superconductors has been measured using an inductive technique near the transition temperature. The relaxation data are analyzed by means of an interaction model based on the general theory of magnetic relaxation. This model assumes the existence of an effective energy barrier (Ueff) and considers thermal activation of the vortices over it. The pinning energy (U0) is reduced to the effective barrier Ueff=U0−Uint by the energy associated to the force of repulsion between vortices (Uint). In this work a linear dependence between the interaction energy and the susceptibility has been used, but other dependencies can easily be introduced to account for the observed nonlinearities of the U(J) curve. The model has been used to extract information of the relaxation of BiPbSrCaCuO samples at several magnetic fields and temperatures after switching off the field. A comparison with the results obtained by the Anderson–Kim model is also provided. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369080
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic disaccommodation in single yttrium iron garnet crystal (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 564-565 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of magnetic disaccommodation in single yttrium iron garnet (YIG) crystals are presented. Two peaks of 0.2%–0.3% are observed in the isochronal spectrum around 130 and 250 K. Comparison of our results with those on polycrystalline YIG samples and with similar data on illuminated and gamma ray irradiated single YIG crystal samples is provided. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116401
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  • 9
    Electronic Resource
    Electronic Resource
    Ferromagnetic resonance and magnetic disaccommodation of Ti-doped single crystal lithium ferrites (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 427-429 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Disaccommodation and ferromagnetic resonance measurements for single crystal titanium-doped lithium ferrites are presented. Magnetic disaccommodation is performed at 1 kHz from 77 to 400 K while ferromagnetic resonance is carried out at 11 GHz from 77 to 300 K. Ferromagnetic resonance line shape asymmetry and anisotropy field data are also shown. A relationship between the asymmetry and the disaccommodation spectra is suggested. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114621
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  • 10
    Electronic Resource
    Electronic Resource
    The dilution of silica in a NiZnCo spinel ferrite matrix (1996)
    Springer
    Applied physics 63 (1996), S. 453-459 
    Details
    ISSN: 1432-0630
    Keywords: 75.60E ; 75.60L ; 82.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Silica may dissolve up to about 0.05 wt% in an iron excess NiZnCo spinel matrix, affecting noticeably the magnetic properties at low and high values of the applied field. The initial permeability is reduced by about 50% with the addition of only 0.1 % SiO2, while the coercivity almost triples, without noticeable changes in porosity or grain distribution. The vacancy and Fe2+ content of the sintered material also show a considerable change. The energy associated to the transformation Fe3+ → Fe2+ for the samples without SiO2 was found to be 0.41–0.42 eV, while for the samples with SiO2 additions it decreased to 0.26 eV. The changes in magnetic properties are thought to be caused, more than because of the mentioned changes in ion distribution, by the stresses and defects created in the lattice due to the very small size of the Si4+ ion, which substitutes Fe3+ ions in tetrahedral sites. The transition Fe3+ → Fe2+ seems to take place exclusively in the octahedral sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571673
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