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  • 1
    Electronic Resource
    Electronic Resource
    Effects of melt temperature on the magnetic properties of FeCuNbSiB alloy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 865-870 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of an Fe73.5Cu1Nb3Si13.5B9 alloy with nanoscale crystalline structure have been investigated as a function of the melt temperature. In the temperature range of 1240 to 1380 °C investigated in the present study, the permeability increases with the melt temperature. This result may be explained in terms of the reduction in the magnetic anisotropy as a function of the melt temperature. This is supported by the results for the remanence ratio, which also increases with melt temperature in a similar manner to the permeability. In the latter part of the work described in this paper, the relationships between the permeability and the coercivity, and the permeability and the remanence ratio have been investigated for the nanocrystalline alloy. It was found that the permeability is correlated more closely to the remanence ratio than the coercivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353298
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Al on the magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloys : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6591-6593 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of Al on the soft magnetic properties of nanocrystalline Fe73.5−xAlxCu1Nb3Si13.5B9 alloy ribbons are investigated in the composition range of 0≤x≤1.0. The relative initial permeability at 1 kHz is found to increase by the addition of Al, and reaches the peak value at x=0.1. The coercivity decreases, rather significantly, with the Al content in the whole composition range investigated in the present work, the values of the coercivity being 12.5 mOe at x=0 and 9.3 mOe at x=1.0. The magnetic induction at an applied field of 10 Oe, however, decreases moderately by the introduction of Al, possibly due to the dilution effect. The improvement in the soft magnetic properties is considered to result from the reduction in the grain size of the α Fe-Si solid solution phase of the Al-added alloy ribbons, which has been observed by transmission electron microscopy. Another factor may be due to the decrease in the intrinsic magnetocrystalline anisotropy K1 as Al is added to the alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352574
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  • 3
    Electronic Resource
    Electronic Resource
    Calculation of magneto-optic Kerr effect in CeSb (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4586-4586 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is well known that CeSb displays the largest ferromagnetic Kerr rotation known with a peak value of over 14°, which is about 30 times that of the strongly magnetic material iron. Conventional magneto-optical theory for magnetically ordered materials ascribes the magneto-optic effects to spin-orbit coupling. We have suggested1 that in such highly correlated partially-delocalized f-electron systems where the magnetization is orbitally driven, the electromagnetic wave couples directly to the electronic magnetization. We believe that such a coupling avoids the weak linkage provided by spin-orbit coupling and is responsible for the giant magneto-optic rotation in CeSb. We first did a conventional itinerant electron (band magnetism) calculation to see if it gives the correct Kerr rotation. The band structure used is obtained from a self-consistent spin-polarized full-potential LMTO calculation with a true interstitial. As a test, we have also calculated the magneto-optic rotation in both bcc and fcc iron where the conventional theory provides good agreement with experiment.〈ks〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348318
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  • 4
    Electronic Resource
    Electronic Resource
    The role of orbital polarization and correlation effects in the magneto-optic behavior of CeSb and CeTe : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5809-5811 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CeSb and CeTe show giant magneto-optic Kerr rotations and also have extremely unusual magnetic ordering properties. CeSb shows peculiar and extraordinarily anisotropic antiferromagnetic behavior; while CeTe shows an ordered moment and TN only 15% that of CeSb, indicative of incipient heavy-fermion behavior. This has been understood in an absolute theory of orbitally driven correlated f-electron magnetism. We seek to understand the giant magneto-optic properties including the role, if any, of explicit correlation effects not captured by an exchange-correlation potential. To this end we have performed full potential linearized muffin-tin orbital polarized band calculations for the optical conductivity tensor, first only spin polarized (orbital polarization only via spin-orbit coupling) and second with explicit orbital polarization. As expected, for CeSb and CeTe the spin-polarized calculation gave the diagonal, ordinary optical, conductivity in good agreement with experiment; but the off-diagonal, magneto-optic, behavior was in poor agreement; and the ordered moment was much different from experiment. For the spin-and-orbitally polarized calculation, the ordered moment agreed reasonably well with experiment for CeSb but very poorly for CeTe. However, the magneto-optic behavior remained distinctly different from experiment for both materials. Thus as anticipated, explicit correlation effects associated with differing discrete f-configuration energies appear to be a central aspect of giant magneto-optic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350144
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  • 5
    Electronic Resource
    Electronic Resource
    Generalized gradient approximation and its effects on the magnetic moments and magneto-optics of f-electron systems : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5433-5435 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have been developing an understanding of the role of correlation (configuration fluctuation) effects on the giant magneto-optic properties of a class of unusual highly anisotropic, magnetically ordered, highly correlated f-electron materials. While orbital polarization in the band calculations improved the ordered moment agreement with experiments for the less correlated materials, the magneto-optic of calculation and experiment remained distinctly different. Moreover, the more highly correlated the material, the worse the agreement of the two quantities. We have now done similar calculations within local-density approximation with gradient (nonlocal) corrections included. While the nonlocal effects introduced by the generalized gradient approximation significantly modify the calculated equilibrium moment and magneto-optic behavior, comparison with experiment reinforces our earlier conclusion that band theory, which treats fluctuations in a time-averaged sense, is inadequate for capturing key effects of interconfigurational fluctuations in correlated-electron systems. Explicit treatment of correlation effects analogous to those we have already reported for the magnetically ordered moments and ordering temperature is necessary for the magneto-optic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353706
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  • 6
    Electronic Resource
    Electronic Resource
    Trend of f-electron localization and itinerancy in rare-earth and light-actinide systems : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5409-5411 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An important characteristic of correlated f-electron systems is their dual nature of having both degrees of localization and itinerancy. Their magnetic behavior evolves with the amount of delocalization they have. Rare-earth monopnictides are on the localized side, with weak delocalization related to hybridization. Uranium monopnictides are on the itinerant side, but localization cannot be fully neglected. To explore the problem from both the localized and the itinerant sides, we have been developing techniques to calculate the evolving properties of f-electron systems on a first principle ab initio basis. This involves: electronic structure calculations; calculating band-f hybridization; calculating Coulomb exchange interaction; and calculating magnetic ordering. In this work, we applied these techniques to evaluate the evolution of f-electron behavior from heavy rare earths to light rare earths to actinides. We will discuss how the degree of localization of the f electrons affects their hybridization and Coulomb exchange interaction with non-f band electrons, and how this influences the two-ion exchange interaction and magnetic ordering. Our calculation is for XSb where X=Ce, Nd, Tb, Er, Yb, U and for CeTe and UTe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353698
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetostriction of melt-spun Dy-Fe-B alloys : 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. 7021-7023 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetostriction of melt-spun ribbons of Dyx(Fe1−yBy)1−x (x=0.2, 0.25, 0.3; 0≤y≤0.2) alloys is systematically investigated as a function of the wheel speed during melt quenching. As the wheel speed increases from 10 to 50 m/s, the magnetic softness improves with the wheel speed rather continuously for the alloys with the Dy content x=0.2 and 0.25 but it exhibits a maximum at the wheel speed of 30 or 40 m/s for the alloys with the highest B content (x=0.3). The softness also improves with the B content for a fixed wheel speed. Homogeneous and ultrafine grain structure is observed for the first time even in the as-spun state when the ribbons of the alloy Dy0.3(Fe0.8B0.2)0.7 are fabricated at the wheel speed of 30 m/s. The ribbon having the ultrafine grain structure exhibits good magnetic softness together with a high strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358074
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  • 8
    Electronic Resource
    Electronic Resource
    Buried heterostructure 0.98 μm InGaAs/InGaAsP/InGaP lasers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2183-2185 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the fabrication and comparison of buried heterostructure and ridge waveguide 0.98 μm lasers with strained InGaAs quantum wells, stepped InGaAsP confinement layers, and InGaP claddings. The buried heterostructure (BH) lasers exhibit superior performance with lower threshold and higher power. We demonstrate a BH laser with 4.4 mA threshold current, 77% differential quantum efficiency, 196 mW of output power, and 150 K characteristic temperature. No catastrophic optical damage is observed on the laser facets, although the facets were not coated or treated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110577
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  • 9
    Electronic Resource
    Electronic Resource
    High p-type doping of ZnSe using Li3N diffusion (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2437-2438 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have achieved a highly doped p-type ZnSe layer using a Li3N diffusion technique. The hole concentration of the p-type ZnSe layer, grown on a GaAs substrate by metalorganic vapor phase epitaxy, reached a level as high as 1017 cm−3. With the diffusion temperature of 470 °C, the resistivity of the layer is as low as 0.4 Ω cm, with hole concentration p(approximately-greater-than)9×1017 cm−3 and hole mobility μp=17 cm2/V s. We made an ohmic contact by using this p+-type ZnSe as a contact layer for p-ZnSe epilayers. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112699
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  • 10
    Electronic Resource
    Electronic Resource
    Carbon Monoxide Pretreatment of Subbituminous Coals (1994)
    s.l. : American Chemical Society
    Energy & fuels 8 (1994), S. 294-300 
    Details
    ISSN: 1520-5029
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ef00044a002
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