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  • 11
    Electronic Resource
    Electronic Resource
    Inhomogeneity model for anomalous Hall effects in n-type Hg0.8Cd0.2Te liquid-phase-epitaxy films (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3150-3153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Anomalous Hall effects, i.e., peaks in the temperature dependence of the Hall coefficient and Hall mobility, have been observed in liquid-phase-epitaxy (LPE) Hg0.8 Cd0.2Te films. After establishing that surface effects are not the cause of the anomalies and that our LPE films are indeed n type, we propose an inhomogeneity model with a network of extended p-type inclusions in an n-type matrix. Good fits to the experimental data have been obtained by computer simulation based on this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335819
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  • 12
    Electronic Resource
    Electronic Resource
    New applications of arc discharge source : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1340-1341 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe some details of the production of 57Fe and C60 ions by the Nielsen source. Some application results are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145004
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  • 13
    Electronic Resource
    Electronic Resource
    Fusion fuel ion temperature diagnostic for directly driven implosions (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3534-3536 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An ultrafast quenched plastic scintillation detector was used to measure the fusion fuel ion temperature at low implosion (DT) neutron yield (5×108–3×109) in the initial experiment performed at the Shenguang II laser facility. The typical temperatures of exploding pusher targets for direct drive were around 4 keV and the uncertainties were ±15–23%. The detection efficiency of the detector to DT neutrons was calibrated at a K-400 accelerator. The time response function of the detection system was calibrated by implosion neutrons from a DT-filled capsule, which can be regarded as a δ function pulsed neutron source due to its much narrower pulse width than that of the measured neutron time-of-flight spectrum. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1396665
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  • 14
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic structure of Nd5Fe17 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5693-5695 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction has been used to refine the crystallographic and magnetic structure of Nd5Fe17. The results of Rietveld refinement yield improved precision for the Fe coordinates relative to the x-ray study. The magnetic moments are refined by assuming that all Fe atoms in comparable environments have the same moment or by grouping sites by average Fe–Fe bond length. Each model leads to five distinct moments, in which the magnitude of the moment is correlated with both the average Fe–Fe bond lengths and the near-neighbor distribution. The results of the refinement are in reasonable agreement with the analysis of the Mössbauer spectra. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370254
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  • 15
    Electronic Resource
    Electronic Resource
    The temperature dependence of the anomalous Hall effects in p-type HgCdTe (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1571-1577 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The anomalous Hall effects of narrow-band-gap p-type HgCdTe, which manifest themselves as negative Hall coefficients at low temperatures, have caused serious problems in material characterization in the past two decades. These phenomena are now widely recognized as being caused by the inverted surface effect describable by Petritz's two-layer model [Phys. Rev. 110, 1254 (1958)]. We report results from variable-temperature Hall measurements on p-type HgCdTe liquid-phase epitaxy and bulk slices with bare, anodically sulfidized, and anodically oxidized surfaces. We show that the Hall anomalies can be eliminated by depositing an anodic sulfide layer on the surface and subsequently can be restored by removing the sulfide layer. Based on Petritz's two-layer model, we were able to use the same set of bulk transport parameters and different sets of surface transport parameters to fit the experimental temperature-dependent Hall coefficient and Hall mobility curves of the same sample with surfaces that have been subjected to different chemical treatments. It was demonstrated that the Hall anomalies occurred when the n-type surface conductivity increased relative to the p-type bulk conductivity. The surface conductivity is mainly controlled by the density of fixed positive surface charges which was found to be larger on an anodically oxidized surface and smaller on an anodically sulfidized surface than on a bare surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342975
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  • 16
    Electronic Resource
    Electronic Resource
    Partitioning behavior of Al in a nanocrystalline FeZrBAl soft magnetic alloy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 439-442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Atom probe field ion microscopy was employed to investigate the distribution of Al in a nanocrystalline Fe88Zr7B3Al2 soft magnet with optimal magnetic performance. The atom probe concentration depth profiles show that the Al atoms preferentially partition into the residual amorphous phase, and the partitioning factor of Al is approximately five times larger in the amorphous phase than in the bcc Fe phase. Based on the experimental results, the beneficial effect of the addition of Al on the soft magnetic properties is attributed to the change of the inherent magnetostriction constant of the residual amorphous phase induced by Al partitioning. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371881
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  • 17
    Electronic Resource
    Electronic Resource
    Observation of auto-oscillations and chaos in subsidiary absorption in yttrium iron garnet (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5480-5482 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Auto-oscillations of the dynamic magnetization and routes to chaos for the first-order transverse pump spin-wave instability have been studied in single-crystal yttrium-iron-garnet (YIG) films. The measurements reported here were made on a 20.8-μm-thick YIG film at 9.4 GHz with the static and microwave fields in the plane of the film. Auto-oscillations at 100–400 kHz were observed in the power absorbed by the film over a relatively narrow static field range of 1100–1460 Oe, compared to the first-order instability (FOI) range of 0–1630 Oe. The auto-oscillation frequency and threshold microwave field amplitude were both strongly field dependent. The threshold amplitudes were about a factor of 2 larger than the FOI threshold amplitudes. At even higher power levels and for an even narrower field range of 1300–1380 Oe, the auto-oscillations showed frequency changes indicative of chaotic behavior. Several different subharmonic bifurcation routes to chaos were observed for different fields within the chaotic region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342353
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  • 18
    Electronic Resource
    Electronic Resource
    Missing magnetic moment in spinel iron oxide films (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3801-3801 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work studies the influence of oxygen flow and substrate temperature on the physical properties of reactive sputtered thin films of iron oxide spinels. We have focused on the variations of the magnetic moment, which can be as low as 20% of the bulk value, for certain experimental conditions. We present a model which attributes the missing moment to a mispopulation of Fe moments on the A and B sites. Direct experimental evidence to prove this model is obtained from conversion electron Mössbauer spectroscopic experiments, which correlate the missing moment with increased A-site population compared with the "textbook'' population (only 8 A sites out of 64 are filled). For example, samples deposited at room temperature have always a low moment and are found to have a large A-site population. When the samples are annealed in vacuum under specific conditions to maintain the oxygen ratio and to give kinetic energy to the atoms to reach their spinel positions, an increase of the magnetic moment is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340619
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  • 19
    Electronic Resource
    Electronic Resource
    Magnetic and atomic short-range order in Ni-Mn base amorphous alloys (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3219-3224 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and compositional short-range correlations in amorphous (MnxNi1−x)75P16B6Al3 (x=0, 0.2, 0.3, and 0.4) were studied by neutron scattering. The spatial magnetic correlation in the alloy with x=0.4 was determined by spin polarized scattering, and it was shown that Mn spins are coupled either antiferromagnetically or ferromagnetically depending upon the separation. The composition dependence of the atomic pair distribution functions obtained by pulsed neutron scattering indicated that there is a strong compositional short-range ordering between Mn and Ni atoms, and that Mn atoms are separated from each other by more than a contact distance. We also present the first clear observation of the annealing effect on the compositional short-range order, in the alloy with x=0.4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338909
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  • 20
    Electronic Resource
    Electronic Resource
    Distribution of Nb and Co in an α-Fe/Nd2Fe14B-type nanocomposite (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6928-6930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Atom probe field ion microscopy was employed to investigate the distribution of the alloying elements in a nanocrystalline Fe76.5Nd8Co8B6Nb1.5 (at. %) alloy consisting of soft magnetic α-Fe and hard magnetic Nd2Fe14B. It was found that Co atoms prefer to partition into Nd2Fe14B phase. The partitioning factor of Co in the hard magnetic phase is approximately 2 with respect to the soft magnetic phase, α-Fe. Atom probe concentration and integrated depth profiles showed that the Nb atoms segregate at the interfaces between the soft and the hard magnetic phases. Based on the atom probe results, the beneficial effects of Nb and Co on the microstructure and the hard magnetic properties of the nanocomposite are discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1317235
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