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Showing 1 to 20 of 57 for “"Co/Cu"”.
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Nanostruktur ionenbestrahlter Fe/Al- und Co/Cu-Grenzschichten
… Systems Fe/Al und des nichtmischbaren Systems Co/Cu. Die Struktur der durch die hochenergetischen Teilchen bei der Deposition entstandenen Grenzschichten wird mit Hilfe von zahlreichen Analyseverfahren (RBS, CEMS, EXAFS, Röntgenverfahren, TEM, AES und magnetische Messungen), sowie …
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Electrical resistivity of YbRh2Si2 and EuT2Ge2 (T = Co, Cu) at extreme conditions of pressure and temperature
… elements in the isostructural YbRh2Si2, EuCo2Ge2, and EuCu2Ge2 compounds. Upon applying pressure, the volume of the unit cell reduces, enforcing either the enhancement of the hybridization of the 4f-localized electrons with the ligand or a change in the valence state of the rare-earth ions. …
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The Smallest Base and Precious Metal Deposits in the World: Vapor Transport and deposition of Co-Cu-Sn-Ag alloys in vesicles
<p>Metallic bronze-Co-Ag alloys ranging from1-90 µm have been discovered in bomb and lava vesicles from the mafic volcanoes of Kilauea in Hawaii and Vesuvius, Stromboli and Etna in Italy. It is inferred that the metals for these alloys were transported (in part) as chloride complexes, and that the …
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Properties of cobalt/copper and cobalt/palladium multilayers.
The physical properties of Co/Cu and Co/Pd magnetic multilayers have been studied. The Co/Cu multilayers were prepared by sputtering, while the Co/Pd multilayers were made by sputtering and molecular beam epitaxy (MBE). Various x-ray diffraction techniques have been used to study the structure of …
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Magnetisation reversal in permanent magnet materials
… isotropic melt-spun Nd-Fe-B powder, and in Sm-(Co,Cu,Fe,Zr) 2:17 anisotropic powder. Magnetisation measurements have been performed using vibrating sample magnetometers, a permeameter, and an adapted pulsed field magnetometer. Magnetisation reversal is explained in terms of domain wall formation …
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Sigma phase in the ternary systems chromium-cobalt-copper and chromium-manganese-copper
… the ternary isothermal sections for the Cr-Co-Cu system and the Crâ Mm-Cu system at lOOO°C. and 975°C., respectively. This was done by vacuum melting the Cr-Co~Cu alloys and annealing these alloys in an inert atmosphere of a helium-hydrogen gas mixture. The Cr-Mn-Cu alloys were melted under …
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Giant Magnetoresistance - eine ab-initio Beschreibung
… gelöst. Der Formalismus wird auf Co/Cu- und Fe/Cr-Vielfachschichten, die Standardsysteme der Magnetoelektronik, angewandt. Es werden die Abhängigkeit der Streuquerschnitte, der spezifischen Restwiderstände und des GMR von der Art und der Lage der Übergangsmetalldefekte in Co/Cu- …
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Fabrication of Core-Shell Nanoparticles
Metallic Cu and Au shells were fabricated around cobalt nanoparticles. A new technique to coat nanoparticles with carbon coatings and poly(methyl methacrylate) (PMMA) was developed. The copper shell formation is a self-limiting process. A thin copper shell (0.82 nm) around the cobalt nanoparticle …
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Remobilization Of Cobalt, Copper, Nickel, Lead, And Zinc In A Riparian Wetland Model
… metals in riparian wetland systems that could have a detrimental impact on the environment is an area of active research. This study utilized a physical model consisting of open water and wetland cells designed to simulate a natural riparian wetland to examine the mobility of five metals. …
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Spatial and temporal analysis of heavy metals in surface waters, bed sediments and suspended sediments of the River Stour, East Kent, U.K.
… of the River Stour, E. Kent, U.K. The occurrence of metal enrichment in surface waters and bed sediments coincides mainly with areas of urbanisation and high density traffic in addition to point source discharges including STW and industrial effluent outlets. Non-tidal surface water …
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Studies of the magnetic properties and microstructures of two rare earth-transition metal type magnetic alloys
… of two types of magnetic alloys based on Sm(Co,Cu,Fe,Zr)\(_z\) (z = 7.4) and Nd\(_{15}\)Fe\(_{77}\)B\(_8\) has been carried out. The optimum heat treatment which gave the best magnetic properties for the Sm(Co,Cu,Fe,Zr)\(_z\) alloy depended primarily on the sintering and solid solution …
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Synthesis, characterization and high pressure propene oligomerization over heteropoly acids, SAPO-11 molecular sieves and MeAPSO-11 molecular sieves
… acids, HPAs, and SAPO-11 and MeAPSO-11 molecular sieves have been proposed to be active for the oligomerization of propene to high quality distillate fuels. In this study these catalysts have been synthesized, characterized, modified and screened for the oligomerization of propene to …
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Magnetic properties of lithographically patterned thin film magnetic elements for magnetic random access memory applications
… area periodic rectangular patterns. Single layer Co, NiFe, and multilayer Co/Cu/NiFe pseudo spin valve films have been patterned into series of element arrays with different sizes. With the aim of assessing the behavior of future magnetic random access memory (MRAM) devices, the magnetic …
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Atmospheric deposition of trace metals to urban and coastal environments
… flux (wet and dry) of trace metals (Ni, Co. Cu, Pb, Cd, Al and Na) to the Irish Sea and the North-West of England is presented. The fluxes were calculated from determined trace metal concentrations of aerosols (Al, Fe, Mn, Cd, Co, Cr, Cu, Na, Ni, Pb, V and Zn) and rainwaters (Ni, Co, Cu, …
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Transport phenomena in metallic nanostructures: an ab initio approach
… bestimmt. Ergebnisse für ultradünne Cu-Filme und die Leitfähigkeitsanomalie während des Wachstums von Co/Cu-Vielfachschichten werden vorgestellt. Der Einfluss von Oberflächen, geordneten und ungeordneten Grenzflächenlegierungen und von Defekten an verschiedenen Positionen in der …
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Nanoscale Josephson Devices
… the development and applications of sub-micron current-perpendicular-toplane devices fabricated by three-dimensional etching with a focused ion beam microscope. This technique was applied to a range of materials, including the study of c-axis Josephson junctions in the high temperature …
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Kopplungen und Riesenmagnetowiderstand (GMR) in Mehrlagensystemen für die Magnetosensorik
… Magnetfeldes. Untersucht wurden Schichten Co/Cu und NiFe/Cu. Es konnten Schichten mit einer Sensitivität von 3.2%/mT präpariert werden. Für den Rückgang der Signalstärke bei erhöhten Temperaturen sind, abhängig von der Cu-Dicke, zwei unterschiedliche Mechanismen verantwortlich. Diese werden …
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Magnetische, thermische und dielektrische Stabilität von magnetischen Tunnelelementen
… (Artificial Antiferromagnet, AAF) verwendet (Co/Cu/Co oder CoFe/Ru/CoFe). Die Motivation für die durchgeführten Untersuchungen ist aus Sicht der potentiellen Anwendung offensichtlich: Die MRAM-Technologie muss kompatibel zur etablierten Halbleiter-Prozesstechnik sein, bei der z. Zt. …
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Armonización del protocolo de evaluación de calidad de sedimentos y materiales dragados en zonas de estuarios y portuarias del Atlántico
La armonización de los protocolos para la caracterización ambiental de los sedimentos y material diagado de dragado en Brasil y España fue basada en la aplicación de un método de evaluación integrado para estimar la calidad de los sedimentos y materiales de dragado en dos zonas portuarias de Brasil …
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Experimentální studium rozpouštění popílku z metalurgie Cu v tropické půdě
… z antropogenních popílků z metalurgie Cu do půdních roztoků a půdy. V experimentu byly použity popílky pocházející ze dvou různých Cu hutí v oblastech Mufulira a Chambishi (Copperbelt, Zambie). Experimentální sáčky s popílkem o navážce 0,5 g byly vloženy do 200 g lateritické půdy a …
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