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  • 1
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    Chiral magnetic domain structures in ultrathin FePd films (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-26
    Description: The magnetization profile of magnetically ordered patterns in ultrathin films was determined by circular dichroism in x-ray resonant magnetic scattering (CDXRMS). When this technique was applied to single crystalline iron palladium alloy layers, magnetic flux closure domains were found whose thickness can constitute a large fraction ( approximately 25 percent) of the total film.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Durr -- Dudzik -- Dhesi -- Goedkoop -- van der Laan G -- Belakhovsky -- Mocuta -- Marty -- Samson -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2166-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Daresbury Laboratory, Magnetic Spectroscopy Group, Warrington WA4 4AD, UK. University of York, York YO1 5DD, UK. University of Amsterdam, Valckenierstraat 65, NL 1018 XE Amsterdam, Netherlands. CEA/Grenoble, Service de Physique des Materia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381879" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    A role for the ESCRT system in cell division in archaea (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-11-15
    Description: Archaea are prokaryotic organisms that lack endomembrane structures. However, a number of hyperthermophilic members of the Kingdom Crenarchaea, including members of the Sulfolobus genus, encode homologs of the eukaryotic endosomal sorting system components Vps4 and ESCRT-III (endosomal sorting complex required for transport-III). We found that Sulfolobus ESCRT-III and Vps4 homologs underwent regulation of their expression during the cell cycle. The proteins interacted and we established the structural basis of this interaction. Furthermore, these proteins specifically localized to the mid-cell during cell division. Overexpression of a catalytically inactive mutant Vps4 in Sulfolobus resulted in the accumulation of enlarged cells, indicative of failed cell division. Thus, the archaeal ESCRT system plays a key role in cell division.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4121953/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4121953/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Samson, Rachel Y -- Obita, Takayuki -- Freund, Stefan M -- Williams, Roger L -- Bell, Stephen D -- 083639/Z/07/Z/Wellcome Trust/United Kingdom -- MC_U105184308/Medical Research Council/United Kingdom -- Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2008 Dec 12;322(5908):1710-3. doi: 10.1126/science.1165322. Epub 2008 Nov 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council (MRC) Cancer Cell Unit, Hills Road, Cambridge CB2 0XZ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19008417" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/chemistry/*metabolism ; Amino Acid Sequence ; Archaeal Proteins/chemistry/*metabolism ; Biological Evolution ; Cell Cycle ; *Cell Division ; Crystallography, X-Ray ; Molecular Sequence Data ; Peptides/chemistry/metabolism ; Protein Structure, Tertiary ; Sequence Alignment ; Sulfolobus/*cytology/genetics/*metabolism ; Sulfolobus acidocaldarius/*cytology/genetics/*metabolism ; Vesicular Transport Proteins/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    REPLACEMENT PROCESSES INVOLVING HIGH FIELD STRENGTH ELEMENTS IN THE T ZONE, THOR LAKE RARE-METAL DEPOSIT (2015)
    Mineralogical Association of Canada
    Details
    Publication Date: 2015-09-05
    Description: The Thor Lake rare-element (Y-REE-Nb-Ta-Zr-Be) deposit, Northwest Territories, Canada, is a world-class deposit hosted by alkaline syenite and granite and has two main mineralized zones, namely the Nechalacho and T Zones deposit. The T Zone is shown to have originally been a pegmatite, but has experienced a strong hydrothermal overprint. Coarse-grained to megacrystic, elongate crystals defining the pegmatitic texture are completely pseudomorphed and are interpreted to have originally been nepheline. The T Zone underwent three main alteration stages, which are (from earliest to latest): (I) silicification of the principal phases of the pegmatite and the associated replacement of igneous aegirine and arfvedsonite by quartz + magnetite + high field strength element (HFSE)-bearing minerals; (II) polylithionite [KLi 2 AlSi 4 O 10 (F,OH) 2 ] alteration (Li metasomatism) that caused pervasive replacement of albite by polylithionite; and (III) phenakite (Be 2 SiO 4 ) alteration (Be metasomatism). Replacement of the primary mineralogy resulted in the formation of abundant pseudomorphs that are characterized by various HFSE minerals [typically, bastnäsite-(Ce), zircon, rutile, xenotime-(Y), and columbite] and phenakite (the predominant Be mineral). The habit and mineralogy of the pseudomorphs, as well as textural relationships in partially altered crystals, make aegirine and mica-group minerals the most likely precursors of the HFSE-rich and Be-rich pseudomorphs, respectively. Although aegirine and arfvedsonite from alkaline rocks can contain HFSE, LA-ICP-MS analysis of aegirine and arfvedsonite from the T Zone indicates that the HFSE concentrations in these two minerals are insufficient to account for the bulk HFSE concentrations of the HFSE-rich pseudomorphs. Therefore, HFSE must have been added to the pseudomorphs during fluid-mineral interaction, requiring hydrothermal mobility of HFSE. An open-space filling process may have been involved in the precipitation of HFSE minerals, including zircon, rutile, anatase, and REE fluorcarbonates. Initial replacement of aegirine by quartz + magnetite increased porosity in some of the T Zone rocks, which may have facilitated HFSE precipitation. Our study also demonstrates that most hydrothermal zircon shows no association with fluorite and that the fluorite in REE-rich pseudomorphs commonly postdates the REE fluorcarbonate minerals [ e.g. , bastnäsite-(Ce)]. These relationships indicate that HFSE precipitation in the T Zone requires a model that does not rely on the mixing of HFSE-, F-bearing fluids with Ca-rich fluids, as has been proposed for other HFSE deposits hosted by alkaline igneous rocks. As the precipitation of HFSE appears to be restricted to pseudomorphs where aegirine and micas have been replaced, the degree of hydrothermal enrichment of HFSE in the T Zone, and possibly in other deposits containing such minerals, may be dictated by the primary abundance of these minerals.
    Print ISSN: 0008-4476
    Topics: Geosciences
    Published by Mineralogical Association of Canada
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  • 4
    Electronic Resource
    Electronic Resource
    Atomic layer epitaxy and molecular beam epitaxy of CdTe/MnTe superlattices: A structural and optical study (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 4300-4308 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Atomic layer epitaxy (ALE) is investigated together with conventional molecular beam epitaxy (MBE) for the growth of CdTe/MnTe superlattices. A systematic structural and magneto-optical study demonstrates that: (i) all Mn atoms incident on the surface get incorporated; however, when a quantity superior or equal to 1 monolayer of Mn is sent onto the surface per ALE cycle, the growth front roughens, leading to the formation of MnTe islands, (ii) optimized atomic layer epitaxy allows us to obtain at 280 °C CdTe/MnTe superlattices with a better control than in conventional MBE, but does not prevent the exchange between Cd and Mn atoms from occurring at the interfaces, (iii) low temperature ALE (200 °C and lower) seems to be a promising way of obtaining more abrupt interfaces. A precise value of the ratio of the elastic coefficients 2c12/c11 is otherwise inferred through this study for zincblende MnTe (1.12). © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368648
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  • 5
    Electronic Resource
    Electronic Resource
    How to grow cubic GaN with low hexagonal phase content on (001) SiC by molecular beam epitaxy (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 2295-2300 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Molecular beam epitaxy (MBE) of cubic GaN on SiC films deposited by chemical vapor deposition on Si has been investigated by reflection high-energy electron diffraction, x-ray diffraction, photoluminescence, and micro-Raman spectroscopy. The wurtzite/zinc-blende ratio, indicative of the material quality, has been found to depend on both the initial substrate roughness and the N/metal ratio impinging on the surface. The results were consistently analyzed by assuming that the MBE growth of cubic GaN is mainly governed by the impinging active N flux, which directly determines the mean-free path of Ga adatoms. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368296
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  • 6
    Electronic Resource
    Electronic Resource
    Growth kinetics and optical properties of self-organized GaN quantum dots (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7618-7624 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Self-organized GaN islands of nanometric scale were fabricated by controlling the Stranski–Krastanov growth mode of GaN deposited by molecular beam epitaxy on AlN. Evidence for ripening of dots under vacuum has been observed, resulting in changes in dot size distribution. We also show that in superlattice samples, consisting of multiple layers of GaN islands separated by AlN, the GaN islands are vertically correlated provided that the AlN layer thickness remains small enough. The luminescence peak of GaN dots is blueshifted with respect to bulk emission and its intensity does not vary with temperature, both effects demonstrating the strongly zero-dimensional character of these nanostructures.© 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367878
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  • 7
    Electronic Resource
    Electronic Resource
    Weak-stripe magnetic domain evolution with an in-plane field in epitaxial FePd thin films: Model versus experimental results (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5472-5474 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic domain structure in thin ferromagnetic films with perpendicular anisotropy is investigated. The effect of an in-plane magnetic field on the presence of domains and the magnetization profile is analyzed within the framework of a one-dimensional analytical model. The general results are reported in a state diagram as a function of the two relevant dimensionless parameters: the quality factor and the ratio of the film thickness to the exchange length. The experimental results, including hysteresis measurements, magnetic force microscopy, and x-ray resonant magnetic scattering obtained on a generic FePd thin layer, are reported and compared to the model. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373376
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic domains in thin films with perpendicular anisotropy: An extensive study (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4604-4606 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of tetragonal ordered alloys grown by molecular beam epitaxy provide a unique template for the study of magnetic configurations in thin films with perpendicular anisotropy. These configurations have been investigated by magnetic force microscopy over a wide thickness range, for large and weak perpendicular anisotropies, in both equilibrium and out of equilibrium states. FePd samples ordered into the tetragonal L10 structure have been obtained by simultaneous evaporation of Fe and Pd on Pd(100). These samples exhibit large perpendicular anisotropy. Magnetic domains have been imaged as a function of increasing thickness from 1.4 to 100 nm. Both an exponential decrease of the domain size at low thickness and a slow increase at higher thickness have been observed, allowing quantitative confirmation of the theoretical evolution expected. Due to this exponential decrease of their equilibrium size, the domains appearing at the beginning of growth exhibit a large size, well above the equilibrium one when the layer thickness is thereafter increased. The growth of the layer then leads to highly out of equilibrium magnetic configurations, where the domain shape evolves through wall undulation at low thickness and thereafter through a fingering instability. This fingering instability preserves large parts of the initial domains, allowing a quantitative estimation of the strain to which they are submitted. Samples grown with a low chemical order exhibit weak perpendicular anisotropy. The magnetization then lies into the plane below a critical thickness. Above this thickness, the images confirm the square root dependence of the period of the stripe structure upon thickness. Stripes as small as 37 nm have been observed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370422
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  • 9
    Electronic Resource
    Electronic Resource
    Domain wall pinning on strain relaxation defects in FePt(001)/Pt thin films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 794-796 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin FePt (001) films, grown by molecular-beam epitaxy on Pt(001), exhibit a very large perpendicular magnetic anisotropy (Ku=5×106 J m−3) and a 100% magnetic remanence in perpendicular field. The lattice misfit between FePt and Pt (1.5%) relaxes through the pileup of a/6 〈112〉 partial dislocations along {111} planes, leading to the formation of microtwins. Atomic force microscopy images demonstrate that this process induces a spontaneous rectangular nanostructuration of the sample, while magnetic force microscopy shows that the microtwins act as pinning sites for the magnetic walls. This leads to square magnetic domains and explains the large coercivity associated with the domain wall propagation. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1390321
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetization profile of ultrathin FePd films (2000)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 7 (2000), S. 178-181 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The method of circular dichroism in X-ray resonant magnetic scattering is presented which allows a straightforward determination of the magnetization profile of magnetic patterns in ultrathin films. Application to single crystalline FePd layers shows unambiguously the presence of magnetic flux closure domains whose thickness can constitute a significant fraction (∼25%) of the total film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904959901448X
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