311 research outputs found
Surfactant induced smooth and symmetric interfaces in Cu/Co multilayers
In this work we studied Ag surfactant induced growth of Cu/Co multilayers.
The Cu/Co multilayers were deposited using Ag surfactant by ion beam sputtering
technique. It was found that Ag surfactant balances the asymmetry between the
surface free energy of Cu and Co. As a result, the Co-on-Cu and Cu-on-Co
interfaces become sharp and symmetric and thereby improve the thermal stability
of the multilayer. On the basis of obtained results, a mechanism leading to
symmetric and stable interfaces in Cu/Co multilayers is discussed.Comment: 7 Pages, 7 Figure
Lithium Transport through Ultrathin Silicon Layers
This contribution presents non-destructive measurements of lithium transport parameters
(diffusivity, permeability) in nanometer sized silicon layers done by a novel neutron
reflectometry (NR) based approach [4]
SDSS J212531.92–010745.9 : the first definite PG 1159 close binary system
Aims. The archival spectrum of SDSS J212531.92−010745.9 shows not only the typical signature of a PG 1159 star, but also indicates the presence of a companion. Our aim was the proof of the binary nature of this object and the determination of its orbital period.
Methods. We performed time-series photometry of SDSS J212531.92−010745.9. We observed the object during 10 nights, spread over one month, with the Tübingen 80 cm and the Göttingen 50 cm telescopes. We fitted the observed light curve with a sine and simulated the light curve of this system with the nightfall program. Furthermore, we compared the spectrum of SDSS J212531.92−010745.9 with
NLTE models, the results of which also constrain the light curve solution.
Results. An orbital period of 6.95616(33) h with an amplitude of 0.354(3) mag is derived from our observations. A pulsation period could not be detected. For the PG 1159 star we found, as preliminary results from comparison with our NLTE models, T eff ∼ 90 000 K, log g ∼ 7.60, and the abundance ratio C/He ∼ 0.05 by number fraction. For the companion we obtained with a mean radius of 0.4 ± 0.1 R, a mass of 0.4 ± 0.1 M, and a temperature of 8200 K on the irradiated side, good agreement between the observed light curve and the nightfall simulation, but we do not regard those values as final
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Disassembly of the Research Reactor FRJ-1 (MERLIN)
This report describes the past steps of dismantling the research reactor FRJ-1 (MERLIN) and, moreover, provides an outlook on future dismantling with the ultimate aim of a ''green field site''. MERLIN is an abbreviation for MEDIUM ENERGY RESEARCH LIGHT WATER MODERATED INDUSTRIAL NUCLEAR REACTOR
On the feasibility to study inverse proximity effect in a single S/F bilayer by Polarized Neutron Reflectometry
Here we report on a feasibility study aiming to explore the potential of
Polarized Neutron Reflectometry (PNR) for detecting the inverse proximity
effect in a single superconducting/ferromagnetic bilayer. Experiments,
conducted on the V(40nm)/Fe(1nm) S/F bilayer, have shown that experimental spin
asymmetry measured at T = 0.5TC is shifted towards higher Q values compared to
the curve measured at T = 1.5TC. Such a shift can be described by the
appearance in superconducting vanadium of magnetic sub-layer with thickness of
7 nm and magnetization of +0.8 kG.Comment: Changes in the 2nd version: small mistypes are corrected. Manuscript
submitted to JETP let. 4 pages, 2 figure
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