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  • 1
    Electronic Resource
    Electronic Resource
    Magneto-optical Faraday effect of porous films comprised of cobalt-substituted barium ferrite fine particles dispersed in a resin (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 339-342 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magneto-optical Faraday effect of porous films comprised of cobalt-substituted barium ferrite (Co:BaM) fine particles fixed by a resin was investigated. The films were prepared by spin-on process of a magnetic ink involving Co:BaM particles on glass substrates. Porous films were formed when the particle concentration of the ink, f, was low, i.e., f〈0.3, and the coated ink was dried while applying a dc magnetic field normal to the substrate plane. The pit size became bigger when the coated ink was thicker, or the field was stronger. The Faraday effect of the films underwent a drastic change caused by the formation of a porous structure. The Faraday rotation spectrum exhibited dispersion-type behavior and its center wavelength was shifted toward longer wavelength with increasing pit dimension. Rotation angle enhancement was observed, which is considered to be caused by the mode modulation of light due to the existence of the pits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353854
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  • 2
    Electronic Resource
    Electronic Resource
    Love-type surface-acoustic waves propagating in amorphous iron-boron films with multilayer structure (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 360-366 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of Love-type surface-acoustic waves (SAWs) in a multilayer structure was investigated. The structures consisted of rf-sputtered iron-boron (FeB) amorphous magnetic films stacked alternatively to SiOx insulating layers i.e., FeB-(SiOx−FeB)×n (where n denotes the stacking number) onto a soft glass substrate. The phase of waves was controlled over a wide range by a magnetic field applied in the film plane, through change in the strength of magnetoelastic coupling between the magnetic moment of the FeB film and SAW propagating in the substrate. The transducers for the Love-type SAW excitation were constructed by combining the interdigital electrodes and ZnO films, prepared by sputtering in an oblique electrode arrangement. The controllable phase shift (ΔΦ) under a magnetic field increases linearly with n, when the total FeB film thickness DM is kept constant (DM=1.5 μm). The ΔΦ of a device with n=8 is about 2300°/cm within the magnetic field smaller than about 120 Oe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351863
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of structural irregularity on propagation properties of optical waves in discontinuous magneto-optical media with one-dimensional quasirandom aray structures : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5988-5990 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To elucidate the effect of structural irregularity on propagation properties of optical waves in discontinuous magneto-optical media, theoretical analysis was carried out by employing random matrix technique and a model with one-dimensional quasirandom array structure. The analysis revealed that the effect of structural irregularity was so significant that the dispersion curves of optical waves varied considerably depending on the media structures. However, no matter how the medium structure varies irregularly, dispersion curves of waves always exist within the confines between those of the half (0...01...1) and the alternate (0101...01) structures. This fact suggests that the effect of structural irregularity becomes less significant when the discontinuous media have fine discrete structures, where the dispersion curves of the half and the alternate structures are very close. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362129
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  • 4
    Electronic Resource
    Electronic Resource
    Optimum geometrical structure of highly magnetostrictive multilayer films for horizontally polarized high frequency magneto-surface-acoustic-wave propagation : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6159-6161 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optimum geometrical structure of highly magnetostrictive multilayer films for the propagation of horizontally polarized magneto-surface-acoustic-wave (Love-type MSAW) was determined theoretically. The multilayered medium is composed of highly magnetostrictive alloy films and insulating films which are stacked alternately on a glass substrate. The analysis revealed that outstanding magnetoacoustic quantities comparable to those of an ideal nonconductive medium can be realized with the conductive multilayer films whose geometrical parameters meet the following conditions: DM/DL≥1, DM/DI≥10, and N∼20, where N is the number of insulating layers having the whole thickness of DI, and DM is the whole thickness of magnetic layers. DL is a limiting thickness of the magnetic film with a single-layer structure, above which the magnetoacoustic quantities are considerably deteriorated due to the micro-eddy current losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352735
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  • 5
    Electronic Resource
    Electronic Resource
    A theoretical analysis of magneto-optical Faraday effect of YIG films with random multilayer structures : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5659-5661 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magneto-optical (MO) Faraday effect of Bi-substituted yttrium iron garnet (Bi:YIG) films with random multilayer structures is analyzed using the random matrix approach, and the Faraday rotation angles (θF) are examined in comparison with those of periodic multilayer films. The films consist of Bi:YIG films and SiO2 dielectric films, which are stacked randomly (periodically) so as to form the random (periodic) multilayer structures. Similarly to the case of MO Kerr effect, a considerable enhancement in θF takes place when the film structure meets the nonreflection condition of light. In particular, θF of the film reaches a maximum of 1.4°/μm at λ=1.15 μm, with the fraction of Bi:YIG layers in the random multilayer film is 41%. This value is about seven times larger than that of a single Bi:YIG film (θF=0.2°/μm), and cannot be attained with periodic multilayer films. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364687
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  • 6
    Electronic Resource
    Electronic Resource
    Magneto-optical Faraday effect of discontinuous magnetic media with a one-dimensional array structure (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1611-1624 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To elucidate unique Faraday spectra observed in porous magnetic films, we theoretically analyzed the magneto-optical Faraday effect of discontinuous media with an ideal one-dimensional array structure. The media are constituted by magnetic materials (width DM) and air gaps (width DG) which are aligned interchangingly. Propagation properties of optical waves in the media, such as the dispersion characteristics and the polarization states, were explored circumstantially, and apparent Faraday rotation and ellipticity spectra of the discontinuous media were obtained. The analysis reveals that the apparent Faraday spectra of the media vary to a large extent from those of a continuous medium depending strongly on the media structures. The key factors which govern the magneto-optical effect of the discontinuous media are structural elements of DM and 2(DM+DG): The Faraday spectra are subject to change only when DM〈λ (λ: the wavelength of optical wave in a vacuum). Then, the magneto-optical effect of the magnetic materials is related to mode conversion from TE to TM when 2(DM+DG)〈λ. If DM〈λ〈2(DM+DG), the mode conversions of both directions from TM to TE and TE to TM are possible. The mode conversion dominates the apparent Faraday spectra of the media, causing the enhancement in the Faraday rotation and systematic shift of the spectra toward shorter and/or longer wavelength of the optical waves. These results explain very well the unique Faraday spectra of the porous films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361005
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  • 7
    Electronic Resource
    Electronic Resource
    Magneto-optical Faraday effect of polystyrene foils containing fine cobalt particles (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 207-210 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magneto-optical Faraday effect of plastic foils composed of cobalt fine particles fixed by polystyrene was investigated. Colloidal suspensions of the cobalt particles from 5 to 10 nm in diameter were prepared by thermal decomposition of dicobalt octacarbonyl dissolved by toluene. After that, polystyrene was added to the solution. The solution was then dried on glass receptacles, and foils 0.1 to 0.2 mm in thickness were obtained by peeling it off from the receptacles. The Faraday rotation spectra θF(λ) of the foils were quite different from those of a cobalt film and polystyrene. θF(λ) varied with the particle size and agglomerate state of particles during solidification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352160
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of YIG fine particles by mist pyrolysis : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5912-5914 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Yttrium iron garnet single crystal fine particles were synthesized by mist pyrolysis from an aqueous solution of yttrium and iron nitrates dissolved in distilled water. Mist was generated by an ultrasonic nebulizer operated at 1 MHz. Thermal decomposition was carried out by passing through the mist in a reaction tube kept a temperature at 800 °C. As-collected particles were spherical, but still amorphous. Fine YIG particles with the average diameter of 0.25 μm were obtained by calcination at 1000 °C for 20 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350104
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  • 9
    Electronic Resource
    Electronic Resource
    Enhancement of magneto-optical Faraday rotation by bismuth substitution in bismuth and aluminum substituted yttrium–iron–garnet single-crystal films grown by coating gels (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2467-2469 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of bismuth substitution on the magneto-optical Faraday rotation of bismuth and aluminum substituted yttrium–iron–garnet (Y3−xBixFe4.2Al0.8O12, x=0 to 2.8) single-crystal films was investigated, where the films were prepared by coating gels involving the constituent metallic ions on single-crystal (GdCa)3(GaMgZn)5O12 garnet plates. The maximum amount of bismuth substitution that yields solely the garnet phase was x=2.5. The onset and the completion temperatures for crystal growth of garnet were decreased by bismuth substitution and were, respectively, 500 and 560 °C for x=2.5. A marked increase in the Faraday rotation θF was observed at heavy substitution x≥2.0 and θF at 3.06 eV (λ=405 nm) was 36.6 deg/μm, but no substantial improvement in the figure of merit for Faraday effect θF/α, where α is the absorption coefficient, was recognized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351081
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  • 10
    Electronic Resource
    Electronic Resource
    Bismuth- and aluminum-substituted YIG single-crystal films on modified gadolinium gallium garnet single-crystal substrates (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1624-1629 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bismuth- and aluminum-substituted yttrium iron garnet single-crystal films with the nominal composition of Y1.5Bi1.5Fe4.2Al0.8O12 (Bi,Al:YIG) were prepared by spin coating a gel on the (111) plane of (GdCa)3(GaMgZn)5O12 single-crystal garnet plates. Crystallinity of the films varies with temperature and time of heat treatment in air after gel coating. Single-crystal films were obtained at Ta=650 °C for 4 h. The onset temperature for crystal growth is about 560 °C, which is about 400 °C lower than that of liquid-phase epitaxy. The crystal-growth process of single-crystal Bi,Al:YIG films was examined by measuring crystallographic structures as well as the magneto-optical Faraday effect. The internal stress giving rise to magnetic uniaxial anisotropy to align the magnetization normal to the film plane plays an important role for completion of single-crystal growth throughout the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349527
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