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Chalk River Laboratories

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About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the magnetism of annite mica has been studied and it has been shown that the antiferromagnetic stacking is part of the intrinsic zero-field magnetic domain structure and that it is entirely due to dipole-dipole forces.

33 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated a hematite bilayer film where the antiferromagnetic layer consisted of small hematites in the 2 to 16 nm range and found that a pronounced exchange bias effect occurred below the blocking temperature of 40 K.
Abstract: We investigated a hematite $\ensuremath{\alpha}$-Fe${}_{2}$O${}_{3}$/permalloy Ni${}_{80}$Fe${}_{20}$ bilayer film where the antiferromagnetic layer consisted of small hematite grains in the 2 to 16 nm range. A pronounced exchange bias effect occurred below the blocking temperature of 40 K. The magnitude of exchange bias was enhanced relative to reports for identical compounds in large grain, epitaxial films. However, the blocking temperature was dramatically reduced. As the N\'eel temperature of bulk $\ensuremath{\alpha}$-Fe${}_{2}$O${}_{3}$ is known to be very high (860 K), we attribute the low-temperature onset of exchange bias to the well-known finite-size effect which suppresses the Morin transition for nanostructured hematite. Polarized neutron reflectometry was used to place an upper limit on the concentration and length scale of a layer of uncompensated moments at the antiferromagnetic interface. The data were found to be consistent with an induced magnetic region at the antiferromagnetic interface of 0.5--1.0 ${\ensuremath{\mu}}_{B}$ per Fe atom within a depth of 1--2 nm. The field dependence of the neutron spin-flip signal and spin asymmetry was analyzed in the biased state, and the first and second magnetic reversal were found to occur by asymmetric mechanisms. For the fully trained permalloy loop, reversal occurred symmetrically at both coercive fields by an in-plane spin rotation of ferromagnetic domains.

33 citations

Journal ArticleDOI
30 Oct 2013-Langmuir
TL;DR: Spontaneously forming structures of a system composed of dimyristoyl phosphatidylcholine (DMPC) and 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate (CHAPSO) were studied and spontaneous structural diagrams of the zwitterionic and charged systems were constructed.
Abstract: Spontaneously forming structures of a system composed of dimyristoyl phosphatidylcholine (DMPC) and 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate (CHAPSO) were studied by small-angle neutron scattering (SANS), 31P NMR, and stimulated echo (STE) pulsed field gradient (PFG) 1H NMR diffusion measurements. Charged lipid dimyristoyl phosphatidylglycerol (DMPG) was used to induce different surface charge densities. The structures adopted were investigated as a function of temperature and lipid concentration for samples with a constant molar ratio of long-chain to short-chain lipids (= 3). In the absence of DMPG, zwitterionic bicellar mixtures exhibited a phase transition from discoidal bicelles, or ribbons, to multilamellar vesicles either upon dilution or with increased temperature. CHAPSO-containing mixtures showed a higher thermal stability in morphology than DHPC-containing mixtures at the corresponding lipid concentrations. In the presence of DMPG, discoidal bicelles (or ribbons) were...

33 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a work package (WP) of the SARNET Source Term topic, which includes reactor-scenariostudies that can be used to define the conditions of new experiments.

33 citations

Journal ArticleDOI
TL;DR: In this article, near surface neutron diffraction data have shown the extent of local stress variation at the critical, fusion boundary location, where compressive longitudinal residual stresses and tensile transverse stresses were measured in the weld metal.
Abstract: Tensile residual stresses at the surface of welded components are known to compromise fatigue resistance through the accelerated initiation of microcracks, especially at the weld toe. Inducement of compression in these regions is a common technique employed to enhance fatigue performance. Transformation plasticity has been established as a viable method to generate such compressive residual stresses in steel welds and exploits the phase transformation in welding filler alloys that transform at low temperature to compensate for accumulated thermal contraction strains. Neutron and X-ray diffraction have been used to determine the stress profiles that exist across the surface of plates welded with low transformation temperature welding alloys, with a particular focus on the stress at the weld toe. For the first time, near surface neutron diffraction data have shown the extent of local stress variation at the critical, fusion boundary location. Compression was evident for the three measurement orientations at the fusion boundaries. Compressive longitudinal residual stresses and tensile transverse stresses were measured in the weld metal.

33 citations


Authors

Showing all 2298 results

NameH-indexPapersCitations
Michael D. Guiver7828820540
Robert J. Birgeneau7858722686
Mike D. Flannigan7121121327
Martin T. Dove6139614767
Luis Rodrigo5834112963
André Longtin5626016372
David Mitlin5619615479
John Katsaras552209263
John E. Greedan5539112171
Gang Li484067713
Matthew G. Tucker452247288
Bruce D. Gaulin452846698
Erick J. Dufourc431445882
Norbert Kučerka431197319
Stephen J. Skinner421948522
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202284
202176
202072
201974
2018104