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  • 1
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering from amorphous ErFe2 and HoFe2 alloys (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3752-3754 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small-angle neutron scattering measurements (SANS) have been made an amorphous ErFe2 and HoFe2 alloys as a function of temperature. These alloys show strong "subcritical'' scattering as the temperature is lowered below their SANS-determined transition temperatures (Tf's) of 105 K (±1 K) and 185 K (±5 K), respectively. The SANS line shapes are Lorentzian above Tf, but become increasingly non-Lorentzian below Tf and are consistent with a Lorentzian plus Lorentzian-squared cross section which is appropriate for these random anisotropy systems. The correlation lengths for ErFe2 and HoFe2 at low T are in the range of 60–70 A(ring). Near Tf ErFe2 shows a sharp peak, while for HoFe2 ξ is resolution limited over a range of 25 K below Tf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340656
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic correlations in an amorphous Gd-Al spin glass (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3639-3641 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small-angle neutron scattering (SANS) as well as magnetization measurements have been made on a sputtered film of Gd43Al57. The low field susceptibility peaks at a freezing temperature Tf of 33 K. This agrees well with the SANS data, which shows a peak in the intensity at this temperature for the lowest Q's measured. The SANS line shapes are unusual in that they can be fitted with a Lorentzian plus Lorentzian-squared cross section with dissimilar correlation lengths. The Lorentzian correlation length peaks near 35 K at a value of ∼14 A(ring), while the Lorentzian-squared correlation length exhibits a large, essentially resolution-limited, value up to temperatures several times Tf. These results are consistent with the coexistence of finite static spin clusters with relatively long-range ferromagnetic correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338698
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  • 3
    Electronic Resource
    Electronic Resource
    Neutron scattering study of the spin ordering in amorphous Tb45Fe55 and Tb25Fe75 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4100-4102 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small-angle neutron scattering measurements (SANS) have been made on Tb45Fe55 and Tb25Fe75 as a function of temperature. The SANS results show that long-range ferromagnetic order is quenched in these alloys and is replaced by a spin-glass-like state. For T〉Tc, where Tc is the transition temperature, both samples exhibit a conventional Lorentzian line shape (in q), but they depart from this form below Tc. We have fitted the low-temperature line shapes with the Lorentzian plus Lorentzian-squared form appropriate for random field systems. As the temperature of the Tb45Fe55 alloy is lowered, the correlation length ξ rises to a rounded maximum of about 80 A(ring) at 250 K (Tc =298 K) and decreases to about 60 A(ring) at 5 K. In contrast, ξ in the Tb25Fe75 alloy exhibits a cusplike form reaching a resolution limited value between 400 and 410 K before declining slowly to 55 A(ring) at low T. In both alloys the coefficient of the Lorentzian term rises sharply as T→0, whereas the Lorentzian-squared coefficient follows approximately the square of the order parameter divided by the correlation length. Both systems thus lend support to the suppression of long-range order by the random anisotropy field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338965
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetostriction in (TbxDy1−x)80Gd20 single crystals (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4995-4997 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gd has been added to binary alloys of Tb and Dy in order to raise the magnetic transition temperature and zero-anisotropy temperature of the alloys. Magnetostriction and differential-scanning-calorimetry measurements were made on four samples of the alloy system (TbxDy1−x)80Gd20 over temperatures from 50 to 300 K in applied fields of 6–20 kOe. The two lowest-order basal-plane magnetostriction constants were derived from the data, as was the basal-plane anisotropy constant. The addition of 20% Gd was found to increase the magnetic transition temperatures, but to decrease or eliminate the zero-anisotropy temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344701
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  • 5
    Electronic Resource
    Electronic Resource
    Crisis-induced intermittency in a parametrically driven, gravitationally buckled, magnetoelastic amorphous ribbon experiment (invited) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5619-5623 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transversely annealed amorphous metallic glass ribbons exhibit extremely large magnetoelastic coupling. Consequently, the Young's modulus of this material can be altered by a factor of 10 with the application of a small magnetic field. This effect is exploited to drive a vertically aligned ribbon, clamped at the bottom and free at the end, by buckling the ribbon gravitationally. Periodic, quasiperiodic, intermittent, and chaotic behavior are observed experimentally. A model for the system is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345905
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  • 6
    Electronic Resource
    Electronic Resource
    Suppression of long-range order by random fields in TbxFe1−x alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3303-3305 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of random anisotropy and exchange fields on the "phase transitions'' in amorphous magnets has been examined in Tb2Fe98 and Tb75Fe25 using small wave-vector (Q) neutron scattering. These two alloys represent opposite extremes in relative magnitude of random anisotropy fields. The neutron results for the spin correlation lengths show that neither alloy exhibits long-range magnetic order well below its spin freezing temperature of 210 K for Tb75Fe25 and approximately 245 K for Tb2Fe98. At Tf the correlation range, ξ, in Tb75Fe25 does reach a resolution limited maximum value before falling sharply to a plateau of ≈50 A(ring) extending to low temperatures. Tb2Fe98 shows only a rounded peak of 75 A(ring) near the magnetization-determined Tf, and, below Tf, ξ remains near its maximum value. Both alloys show marked departures from the Lorentzian cross section below Tf, and are fitted to a Lorentzian (L) plus Lorentzian squared (L2) form appropriate for random field systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335129
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic field dependence of the small angle scattering in amorphous DyCu (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3430-3431 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The previously reported small angle neutron scattering (SANS) from the spin glass amorphous DyCu (TF =17 K) was examined in applied fields up to 15 kOe. Application of the field caused a decrease of the total SANS intensity and a decrease of the correlation length derived from the Lorentzian line shapes to ∼6 A(ring) from the zero field value of 13.5 A(ring). Field-cooling and relaxation effects were also observed in the SANS intensity and are compared with similar phenomena in magnetization measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335066
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  • 8
    Electronic Resource
    Electronic Resource
    Applied field response of the spin glass state in amorphous NdFe2 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3432-3434 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic correlations and the response of the spin system to an applied field have been studied in sputtered amorphous NdFe2 using high-resolution small angle neutron scattering (SANS) techniques. In zero field the line shape of the scattering is Lorentzian down to a spin freezing temperature of approximately 330 K. Below this temperature the line shape becomes increasingly non-Lorentzian and has been analyzed using a Lorentzian plus Lorentzian-squared cross section appropriate for a random anisotropy field system. The correlation length shows a broad maximum of 170 A(ring) near 285 K (below Tc) and then decreases to a constant value of ≈80 A(ring) for T〈 100 K. SANS data taken in applied fields up to 18 kOe at 83 K produced constant intensity contours which are elliptically distorted with the Q(parallel)H direction being the major axis. The overall intensity and the calculated spin correlation length both drop abruptly with increased field. This behavior is consistent with the field driving the dominant part of the spin system into an infinite cluster with the residual smaller spin clusters exhibiting a super-paramagnetic type response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335067
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  • 9
    Electronic Resource
    Electronic Resource
    Changes in Thymocyte Subsets Induced by Estradiol Administration or Pregnancy (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 650 (1992), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1992.tb49105.x
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  • 10
    Electronic Resource
    Electronic Resource
    Hormonal Regulation of T Cell Differentiation in Aging Mice (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 650 (1992), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1992.tb49107.x
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