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  • 1
    Electronic Resource
    Electronic Resource
    Induced magnetic anisotropy in Co–Mn–Si–B amorphous microwires (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1402-1409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of both thermal treatments as well as chemical etching treatments on the magnetic behavior has been investigated in nearly-zero magnetostriction glass-coated amorphous (Co1−xMnx)75Si10B15 (x=0.08, 0.09, and 0.10) microwires. Such a small change in x results in rather strong changes in the hysteresis loop parameters including coercitivity, Hc, and initial magnetic permeability, μ15. This effect was ascribed to the change of sign of the magnetostriction constant with a proper combination of the coercivity and relatively high initial permeability for the as-cast x=0.09 sample. Thermal treatment (temperatures 100–200 °C for 0.5–2 h) as well as chemical etching in 20% diluted fluoridric acid with duration from 0.5 up to 50 min modify this magnetic parameters owing to the internal stresses relaxation process. In particular, annealing under applied magnetic field (field annealing) can improve more significantly these magnetic parameters: increasing both Hc and μ15. Such phenomenology can be interpreted considering the noticeable longitudinal magnetic anisotropy induced by the combined effects of the magnetic field and strong internal stresses arising from the coating during the thermal treatment. The reduction of the glass coating thickness by chemical etching leads to a decrease of the internal stresses from a coating and, consequently, to a decrease of the transverse magnetoelastic anisotropy. Such decrease of anisotropy plays a role similar to that induced by field annealing on the hysteretic behavior. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372063
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  • 2
    Electronic Resource
    Electronic Resource
    Exact solutions to chaotic and stochastic systems (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 11 (2001), S. 1-15 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate functions that are exact solutions to chaotic dynamical systems. A generalization of these functions can produce truly random numbers. For the first time, we present solutions to random maps. This allows us to check, analytically, some recent results about the complexity of random dynamical systems. We confirm the result that a negative Lyapunov exponent does not imply predictability in random systems. We test the effectiveness of forecasting methods in distinguishing between chaotic and random time series. Using the explicit random functions, we can give explicit analytical formulas for the output signal in some systems with stochastic resonance. We study the influence of chaos on the stochastic resonance. We show, theoretically, the existence of a new type of solitonic stochastic resonance, where the shape of the kink is crucial. Using our models we can predict specific patterns in the output signal of stochastic resonance systems. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1350455
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  • 3
    Electronic Resource
    Electronic Resource
    Magneto-optical properties of stacked self-assembled InAs quantum dots (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3760-3762 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article, we report magneto-photoluminescence measurements on stacked self-assembled InAs quantum dots. By applying a magnetic field parallel to the growth direction, we determined the exciton reduced mass and exciton radius from the photoluminescence (PL) peak energy. We observed an asymmetric increase of the full width at half maximum of the quantum dots PL peak to the high-energy side that we associate to the size selectivity of the oscillator strength of the ground state transitions. The observed increase of the integrated intensity of the quantum dots line is explained in terms of the reabsorption of the photons emitted by the GaAs substrate and the InAs wetting layer. These effects are related to the multilayer structure of the sample. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1353565
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  • 4
    Electronic Resource
    Electronic Resource
    Stress-annealing in Fe73.5Cu1Nb3Si13.5B9 amorphous alloy ribbon (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4389-4394 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Investigations on measurements of the coercive field and the magnetization work of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy are reported. Nanocrystalline samples are prepared from an amorphous precursor by Joule heating in the presence of tensile stress of 420 MPa. Values of the parameters of the thermal treatment are chosen as to develop a different degree of the nanocrystalline character. Results on the magnetization work W are interpreted in terms of the random anisotropy model. Fitting of the experimental curves of W against applied stress allows us to obtain the annealing dependence of the magnetostriction λ and the stress-induced anisotropy Kann. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373082
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  • 5
    Electronic Resource
    Electronic Resource
    Effective magnetic anisotropy of amorphous and nanocrystalline Fe71.5Al2Cu1Nb3Si13.5B9 alloy ribbon (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6422-6425 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective magnetic anisotropy of the Fe71.5Al2Cu1Nb3Si13.5B9 alloy with different nanostructures has been investigated. The nanostructured phase was produced by means of thermal treatment (520–600 °C during 1 h) to develop the devitrification of the precursor amorphous material. The effective magnetic anisotropy was evaluated from the measurement of the bias field dependence of the transverse susceptibility. Values of the effective anisotropy field, Hk, from 20 Oe (as-quenched sample) down to 7 Oe (optimum nanocrystalline state) were obtained. Such values of Hk are close to those obtained in the classical nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy (8–10 Oe) alloy. The Al could enhance the intergranular coupling, leading to the ultrasoft magnetic character of this nanocrystalline Al-containing alloy. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371006
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  • 6
    Electronic Resource
    Electronic Resource
    On the relevance of Kondo disorder in the non-Fermi-liquid behavior of UCu4Ni (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5126-5128 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical, magnetic and thermal properties of UCu4Ni show temperature dependencies suggestive of non-Fermi-liquid (NFL) behavior. In this work, we present an interpretation of these properties in terms of a Kondo disorder model for NFL behavior. The overall magnitude and temperature dependence of the magnetic susceptibility and the specific heat are found to be consistent with this model, assuming reasonable values of the relevant parameters, the average Kondo temperature (TK), the Kondo coupling constant (λ) and the distribution width w. These results are discussed in comparison with those obtained for other NFL systems, as UCu4Pd and UCu3.5Pd1.5. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373270
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  • 7
    Electronic Resource
    Electronic Resource
    Successful treatment of aphthous ulcerations in AIDS patients using topical granulocyte-macrophage colony-stimulating factor (2000)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 142 (2000), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Oral recurrent aphthous ulceration (RAU) is a well-recognized complication in patients infected with human immunodeficiency virus. RAU can be progressive and destructive, causing dysphagia and secondary malnutrition. The aetiology of RAU remains unknown, and its response to available treatments is often unsatisfactory. We describe three patients with advanced AIDS who suffered from extensive RAU which failed to respond to several treatments, including topical viscous lidocaine and topical and systemic glucocorticoids. Owing to difficulties in using thalidomide (two patients had neurological conditions which precluded thalidomide use), all three patients were treated with an oral solution containing recombinant human granulocyte-macrophage colony-stimulating factor (GM-CSF, 400 μg in 5% glucose 200 mL). From the first application, all three patients showed significant improvement of their lesions and amelioration of pain, and they were completely cured in a few days. No adverse effects were recorded. The patients did not show relapses of RAU over a prolonged follow-up. Controlled trials are warranted in order to establish the role of GM-CSF as a valid, alternative option for aphthous ulcerations of the mouth in AIDS patients in whom corticosteroids or thalidomide are not suitable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.2000.03263.x
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetization reversal of Co-rich wires in circular magnetic field (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 537-539 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The process of magnetization reversal of Co-rich amorphous wires in circular magnetic field has been studied by Kerr effect. The transverse Kerr loops had features, related to circular domains nucleation and domain wall propagation. A correlation between the switching field and wire length has been found. A remarkable change of the magnetization reversal under the application of axial dc magnetic field was observed. This could be explained by the presence of an interaction between the axial inner core and circular outer shell of Co-rich wires. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421209
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  • 9
    Electronic Resource
    Electronic Resource
    Stress induced magnetic anisotropy and coercivity in Fe73.5Cu1Ta3Si13.5B9 amorphous alloy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6623-6627 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic anisotropy induced by stress annealing (500 MPa) in Fe73.5Cu1Ta3Si13.5B9 amorphous alloy has been investigated. Such thermal treatment was carried out by means of the Joule heating technique (current density ranging from 20 to 40 A/mm2). As a result, a uniaxial in-plane magnetic anisotropy was induced in the samples. The dependence of this induced anisotropy on the current density shows a maximum (1000 J/m3) around 34 A/mm2, which can be connected to the first stages of the crystallization process, followed by a minimum at 37 A/mm2. The coercive field increases with this kind of thermal treatment, and is around 10–15 A/m for the optimum nanocrystalline state, which is one order of magnitude larger than that reported for this nanocrystalline material treated in conventional furnace. The variations of the coercive field after stress annealing seem to be correlated to the induced magnetic anisotropy behavior. The minimum anisotropy occurs for the optimum nanocrystallization process. The induced anisotropy should be mainly understood as of magneto-elastic character arising in the FeSi grains due to internal stresses. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322600
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  • 10
    Electronic Resource
    Electronic Resource
    Structural evolution during chemical vapor deposition of diamond thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5716-5719 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In situ phase-modulated ellipsometry was employed to monitor the nucleation and growth processes of diamond thin films fabricated by chemical vapor deposition. The effective extinction coefficient (k) at 1.96 eV was used as a basis for dividing the deposition process into intervals. The film growth was aborted at various k values yielding diamond film samples that represent snapshots of the growth process at different stages. Ex situ characterization of the films was performed using Raman spectroscopy, scanning electron microscopy, and x-ray diffraction. The results indicate that the diamond film deposition process consists of various stages in which the crystalline quality, the net compressive stress, and the relative amount of non-sp3 carbon follow different trends. A correlation between the effective k value measured in situ and the film microstructure characterized ex situ was established which enables the monitoring of the diamond film growth process in real time. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1313783
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