&lt;title&gt;Neutron inverse optics in layered materials&lt;/title&gt;

Kaiser, H.; Hamacher, K.; Kulasekere, R.; Lee, Wing T.; Ankner, John F.; DeFacio, Brian; Miceli, P. F.; Worcester, David L.

doi:10.1117/12.179750

Cited by 13 publications

(14 citation statements)

References 2 publications

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“…1, using an electromagnet. The experiments were performed using the GANS reflectometer 16 at the Missouri University Research Reactor and the specular reflectivity was measured separately for spin-up and spin-down incident neutrons ͑a polarization analyzer was not used͒ having a wavelength of ϭ2.35 Å. The angular divergence of the incoming beam was 0.02°and the beam width at sample position was 0.23 mm.…”

Section: Resultsmentioning

confidence: 99%

Spin-polarized neutron reflectivity: A probe of vortices in thin-film superconductors

et al. 1999

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It is demonstrated that the specular reflectivity of spin-polarized neutrons can be used to study vortices in a thin-film superconductor. Experiments were performed on a 6000 Å thick c-axis film of YBa 2 Cu 3 O 7Ϫx with the magnetic field applied parallel to the surface. A magnetic hysteresis loop was observed for the spinpolarized reflection and, from these data, the average density of vortices was extracted. A model is presented which relates the specular reflectivity to the one-dimensional spatial distribution of vortices in the direction perpendicular to the surface. Unlike other techniques, neutron reflectivity observes vortices in a geometry where they are parallel to the interface. ͓S0163-1829͑99͒07021-6͔

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Section: Resultsmentioning

confidence: 99%

Spin-polarized neutron reflectivity: A probe of vortices in thin-film superconductors

et al. 1999

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“…The SPNR measurements were performed using the GANS reflectometer 11 at the Missouri University Research Reactor ͑MURR͒ with a neutron wavelength of 2.35 Å. A supermirror was employed to select the spin state of the neutron beam to be perpendicular to the scattering plane, and the spin state could be switched using a flipper coil located downstream from the mirror.…”

Section: Methodsmentioning

confidence: 99%

Orientation of vortices in a superconducting thin film: Quantitative comparison of spin-polarized neutron reflectivity and magnetization

et al. 2000

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We present a quantitative comparison of the magnetization measured by spin-polarized neutron reflectivity ͑SPNR͒ and dc magnetometry on a 1370 Å-thick Nb superconducting film. As a function of magnetic field applied in the film plane, SPNR exhibits reversible behavior whereas the dc magnetization shows substantial hysteresis. The difference between these measurements is attributed to a rotation of the vortex magnetic field out of the film plane as the applied field is reduced. SPNR measures only the magnetization parallel to the film plane, whereas dc magnetization is strongly influenced by the perpendicular component of magnetization when there is a slight sample tilt; thus combining the two techniques allows one to distinguish two components of magnetization in a thin film.

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“…The scattering analysis is based on Panatt [7] as extended to neutron scattering by Ankner [8], Ankner and Majkrzalc: [9]. An earler, complimentary analysis using this method was given in [3]. The addition of a wavelet study is presented here.…”

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“…The GANS instrumentat MURR was described by Kaiser et al [3], so only the parameters which are used here will be given. Several nationallaboratories operate similar instruments but this one is the only such spectrometer located at a U.S. University.…”

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Wavelet Inverse Neutron Scattering Study of Layered Metallic NiC-Ti Composites

Saab

DeFacio

Kaiser

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

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INTRODUCI'IONComposites are prevalent in high technology devices such as aircraft, computers, automobiles and communications systems. They improve brittleness and provide a lower density which enhances mechanical strength. EJectron and light manipulating composites will be used more and more in the future. lt is necessary to have a capability of inspecting composites, both to assure production quality and as a baseline for later NDE. In this paper, we present a study using wavelet, inverse neutron optics and the grazing angle neutron spectrometer, GANS, at the Missouri University Research Reactor, MURR.Neutrons are electrically neutral matter-waves with mass just greater than the proton. They have good penetmtion depths since they scatter almost entirely from the nuclei in a solid This property gives thermal neutrons the capability of measuring the amount of residual stress in many solids (1,2) by diffracting from the atomic planes. However, since the 10MWatt reactor provides the I014 neutronstcm2 sec incident onto the collimeter it is not a technique for all applications in NDE. But it reaches deeply into the solid and relays detailed information on an atomic length scale [3] so it may be worthwhile to leam what can (and what cannot) be determined from this modality. ANALYSESThe theoretical description used has deep roots in physics going back 50 years to Fermi and Zinn [4], who showed experimentally that neutrons have all of the optical properlies of light: reflection, refraction, interference, diffraction, collimation, polarization and can be made quasi-

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<title>Neutron inverse optics in layered materials</title>

Cited by 13 publications

References 2 publications

Spin-polarized neutron reflectivity: A probe of vortices in thin-film superconductors

Spin-polarized neutron reflectivity: A probe of vortices in thin-film superconductors

Orientation of vortices in a superconducting thin film: Quantitative comparison of spin-polarized neutron reflectivity and magnetization

Wavelet Inverse Neutron Scattering Study of Layered Metallic NiC-Ti Composites

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