342 research outputs found
Between ‘faith’ and ‘facts’: By what standards should we assess International Criminal Justice?
Sovereignty, International Governance and Global Value
Reckoning with Colonial Injustice: International Law as culprit and as remedy?
Exploring the Frontiers of International La
Effect of dopants on thermal stability and self-diffusion in iron nitride thin films
We studied the effect of dopants (Al, Ti, Zr) on the thermal stability of
iron nitride thin films prepared using a dc magnetron sputtering technique.
Structure and magnetic characterization of deposited samples reveal that the
thermal stability together with soft magnetic properties of iron nitride thin
films get significantly improved with doping. To understand the observed
results, detailed Fe and N self-diffusion measurements were performed. It was
observed that N self-diffusion gets suppressed with Al doping whereas Ti or Zr
doping results in somewhat faster N diffusion. On the other hand Fe
self-diffusion seems to get suppressed with any dopant of which heat of nitride
formation is significantly smaller than that of iron nitride. Importantly, it
was observed that N self-diffusion plays only a trivial role, as compared to Fe
self-diffusion, in affecting the thermal stability of iron nitride thin films.
Based on the obtained results effect of dopants on self-diffusion process is
discussed.Comment: 10 pages, 9 fig
Fe and N self-diffusion in non-magnetic Fe:N
Fe and N self-diffusion in non-magnetic FeN has been studied using neutron
reflectivity. The isotope labelled multilayers, FeN/57Fe:N and Fe:N/Fe:15N were
prepared using magnetron sputtering. It was remarkable to observe that N
diffusion was slower compared to Fe while the atomic size of Fe is larger
compared to N. An attempt has been made to understand the diffusion of Fe and N
in non-magnetic Fe:N
Pulsed laser deposition growth of heteroepitaxial YBa2Cu3O7/La0.67Ca0.33MnO3 superlattices on NdGaO3 and Sr0.7La0.3Al0.65Ta0.35O3 substrates
Heteroepitaxial superlattices of [YBa2Cu3O7(n)/ La0.67Ca0.33MnO3(m)]x, where
n and m are the number of YBCO and LCMO monolayers and x the number of bilayer
repetitions, have been grown with pulsed laser deposition on NdGaO3 (110) and
Sr0.7La0.3Al0.65Ta0.35O3 (LSAT) (001). These substrates are well lattice
matched with YBCO and LCMO and, unlike the commonly used SrTiO3, they do not
give rise to complex and uncontrolled strain effects due to structural
transitions at low temperature. The growth dynamics and the structure have been
studied in-situ with reflection high energy electron diffraction (RHEED) and
ex-situ with scanning transmission electron microscopy (STEM), x-ray
diffraction, and neutron reflectometry. The individual layers are found to be
flat and continuous over long lateral distances with sharp and coherent
interfaces and with a well-defined thickness of the individual layer. The only
visible defects are antiphase boundaries in the YBCO layers that originate from
perovskite unit cell height steps at the interfaces with the LCMO layers. We
also find that the first YBCO monolayer at the interface with LCMO has an
unusual growth dynamics and is lacking the CuO chain layer while the subsequent
YBCO layers have the regular Y-123 structure. Accordingly, the CuO2 bilayers at
both the LCMO/YBCO and the YBCO/LCMO interfaces are lacking one of their
neighboring CuO chain layers and thus half of their hole doping reservoir.
Nevertheless, from electric transport measurements on asuperlattice with n=2 we
obtain evidence that the interfacial CuO2 bilayers remain conducting and even
exhibit the onset of a superconducting transition at very low temperature.
Finally, we show from dc magnetization and neutron reflectometry measurements
that the LCMO layers are strongly ferromagnetic
The Future of International Legal Scholarship: Some Thoughts on ‘Practice’, ‘Growth’, and ‘Dissemination’
Sovereignty, International Governance and Global Value
Multi-wavelength photometric variation of PG1605+072
In a large coordinated attempt to further our understanding of the -mode
pulsating sdB star PG1605+072, the Multi-Site Spectroscopic Telescope (MSST)
collaboration has obtained simultaneous time-resolved spectroscopic and
photometric observations. The photometry was extended by additional WET data
which increased the time base. This contribution outlines the analysis of the
MSST photometric light curve, including the four-colour BUSCA data from which
chromatic amplitudes have been derived, as well as supplementary FUV spectra
and light curves from two different epochs. These results have the potential to
complement the interpretation of the published spectroscopic information.Comment: 6 pages, to be published in "Interpretation of asteroseismic data",
proceedings of the HELAS NA5 Workshop, eds. W. Dziembowski, M. Breger and M.
Thompson, Communications in Asteroseismology, 15
Environmental Protection and Transitions from Conflict to Peace
bookExploring the Frontiers of International La
Introduction: Protection of the Environment and Jus Post Bellum: Some Preliminary Reflections
Exploring the Frontiers of International La
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