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  • 11
    Electronic Resource
    Electronic Resource
    Long-range magnetic reconstruction of ferromagnetic films with diffused interfaces (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3649-3651 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two models of the magnetic structure of a ferromagnetic film deposited on a substrate are developed, with a view to explaining the reduced moment of Fe on GaAs. In the first, spin canting induced by antiferromagnetic exchange in the interface layer falls off rapidly in the interior of the ferromagnet, the characteristic distance being the size of the reconstructed magnetic unit cell in the interface. In the second, random anisotropy in the interface layer induces weakly pinned fluctuations of the magnetization which penetrate to a distance of order the domain wall width, approximately 100 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340672
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of dipolar coupling on the magnetism of disordered solids (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4413-4415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study is made of the stability of ferromagnetic long-range order under fluctuations due to random easy magnetic axes, including the dipole–dipole coupling. This coupling produces two effects. There is a random dipole field that acts on the spins in the same way as does the random uniaxial anisotropy. Secondly, there is an average dipole field that acts to prevent the appearance of spin-density gradients. The net result is very dependent on the number of spin components. For the planar model in three dimensions, there is a logarithmic divergence of the magnetization reversal and power-law spatial dependence of the correlation function. Thus the lower critical dimension is reduced from four to three by the presence of dipole interactions in the planar (x-y) version of the random easy axis model. For the Heisenberg model the random magnetic anisotropy destroys the long-range ferromagnetic order. There is a correlation length that depends on the direction of the local magnetization. Results of a calculation of the spin–spin correlation function are used to predict qualitatively different ordered regions (domains) for small random anisotropy as compared to large random anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338393
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  • 13
    Electronic Resource
    Electronic Resource
    Moment distribution in amorphous magnetic ribbons by Mössbauer measurements (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3644-3646 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mössbauer effect measurements were obtained on smooth-surface Fe78B13Si9 amorphous ribbons annealed in a transverse magnetic field at high temperature. Absorption spectra were obtained with the ribbon plane tilted at several angles with respect to the direction of the γ rays, in an external field ranging from 0 to 10 Oe. Intensity ratios were analyzed to obtain the magnetization as a function of field. A large zero-field spread was deduced and excess scatter near the anisotropy field was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338702
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  • 14
    Electronic Resource
    Electronic Resource
    Noncollinear phase of TbDy alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5987-5989 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: TbxDy1−x is probably the simplest example of a magnetic system with competing anisotropy. Tb and Dy are both low-temperature easy-plane ferromagnets with well-characterized anisotropy energies, such that Tb moments prefer the b axis in the hcp structure, while Dy moments prefer the a axis. It has been predicted, by a two-subnetwork approximation, that the low-temperature phase of the alloys with x between 0.86 and 0.76 exhibits a nonsymmetry direction of magnetization, a noncollinear spin structure, and 12th-order anisotropy. However, the two-subnetwork approximation is suspect when used to describe magnetic structure in alloys near phase boundaries, such as those between the ferromagnetic and the noncollinear phase. Using a probability distribution for site occupation, we have calculated the fluctuations of the spin orientation and the spin-spin correlation function as a function of composition in the noncollinear phase. The mean-square fluctuation in spin orientation is proportional to (xb−x)1/2, where xb is the critical concentration which separates the b axis ferromagnet from the noncollinear magnet. The average orientation also varies as (xb−x)1/2. Therefore, the simple two-subnetwork model is not valid near the phase boundaries. In fact, we find that the fluctuations from the average site occupation increase the range of stability of the noncollinear phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346037
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  • 15
    Electronic Resource
    Electronic Resource
    First-order line and critical end point of cubic rare-earth pseudobinaries in RxR'1−xT2 in the H, X plane (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3359-3359 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the effects that an applied magnetic field has on the nature of the off-principal axis magnetic phases of rare-earth-transition metal pseudobinaries. The magnetic field is taken to be in the (01¯1) plane of these cubic materials but is otherwise arbitrary. Besides the expected second-order transition which takes place only when the field is in the [100] direction, there occurs a low-field first-order transition which separates two spin-canted phases. This transition is predicted for a range of concentration between the zero-field spin-canted/[111] boundary x0 and a somewhat larger concentration of [111]-easy rare earths x1. The field at the first-order transition is a monotonically increasing function of concentration within this range, starting at zero at x0 and reaching a critical field Hc of the order of D2/JMs at x1, where D is the fourth-order crystal-field strength and J is the exchange energy density. The point Hc, x1 is a critical end point in the H, x plane. The random fluctuations in sign of the crystalline field will most strongly effect the above results. Estimates of the effects of these fluctuations on the phase diagram will be made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335097
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  • 16
    Electronic Resource
    Electronic Resource
    THERMAL PROCESS SIMULATION FOR ASEPTIC PROCESSING OF FOODS CONTAINING DISCRETE PARTICULATE MATTER (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 39 (1974), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1974.tb07324.x
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  • 17
    Electronic Resource
    Electronic Resource
    The Knowledge Acquisition Bottleneck: Time for Reassessment? (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Expert systems 5 (1988), S. 0 
    Details
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: Abstract: Knowledge acquisition has long been considered to be the major constraint in the development of expert systems. Conventional wisdom also maintains that the major problem encountered in knowledge acquisition is in identifying the varying structures and characteristics of domain knowledge and matching these to suitable acquisition techniques. With the aid of the first substantial systematic analysis of a sample of expert systems applications developed in the real world, the authors describe what is actually going on in terms of knowledge acquisition. In the light of the evidence, it is argued that a reappraisal of the conventional approach to knowledge acquisition is necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-0394.1988.tb00065.x
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  • 18
    Electronic Resource
    Electronic Resource
    Magnetoelasticity and moment rotation in amorphous rare earth-iron alloys
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 15-18 (1980), S. 593-594 
    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(80)90677-0
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  • 19
    Electronic Resource
    Electronic Resource
    Deterrent Effect of Insecticides on Malaria Vectors (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 860-861 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] tHE effect of residual insecticides on malaria vectors is Jl commonly assessed in the laboratory by using treated panels or containers lined with paper impregnated with the insecticide under examination, with which anophelines from laboratory cultures of known age and feeding conditions are brought ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/200860a0
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  • 20
    Electronic Resource
    Electronic Resource
    [Letters to Editor] (1921)
    [s.l.] : Nature Publishing Group
    Nature 107 (1921), S. 587-587 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE result for p=37 given in NATURE of June 9, p. 456, was found to conform to Legendre's rule; since this rule fails in the case of p=61, it is interesting, as noted by Prof. Mathews, to know if this is the lowest prime for which the rule fails. I have worked out the case for p =41, and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/107587b0
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