Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Simple method may improve computer memory, catalysts, ceramic/metal seals, and nanodevices

09.08.2004


A method that creates smooth and strong interfaces between metals and metal oxides without high-temperature brazing has been patented by researchers at the National Nuclear Security Administration’s Sandia National Laboratories, Pacific Northwest National Laboratory, and the University of North Texas.

The method can improve magnetic random-access memories, which allow next-generation computers to boot up instantly yet retain their entire memories after power interruptions. Depositing flat, nanometer-thin crystalline and ferromagnetic metallic layers on similarly thin oxide layers increases strength, stability, and uniformity of the oxide-metal interface. This reduces manufacturing cost and requires less electricity to produce more rapid magnetic effects for the computer memory.

The inexpensive technique also may produce better, less expensive (more highly dispersed but stable) catalysts for chemical reactions, better ceramic/metal seals, and lead to improved nanodevices.



The method works by controlling the growth and interfacial strength of a metal deposited on an oxide layer. There are two distinct methods within the patent.

By fully hydroxylating the oxide surface and then cleansing it of impurities, a chemical reaction can oxidize a fraction of deposited metal atoms, incorporating them by strong ionic bonds into the oxide surface. However, these metal atoms also bind strongly to metallic atoms above them and serve as "anchors" to bind more metal. At sufficient concentration, laminar growth is achieved and crystallinity is observed by approximately six metal atomic layers. These findings are supported by both experimental and theoretical results.

Another method controls the wetting characteristics (that is, the layer-by-layer deposition) and increases adhesion between a metal and an oxide layer. By introducing or producing a sub-monolayer of negatively charged species (e.g., a fraction of hydroxyl-radical coverage) to the surface of an oxide layer, layer-by-layer growth of metal deposited onto the oxide surface is promoted. This increases the adhesion strength of the metal-oxide interface. The negatively charged species can either be deposited directly onto the oxide surface or in the form of a compound that dissociates on, or reacts with, the surface to form the negatively charged species. The deposited metal adatoms are thereby bound laterally to the negatively charged species as well as vertically to the oxide surface, binding them strongly to the surface of the oxide, while otherwise they are bound weakly. This method has also been demonstrated by experiment and supported by theory.

Neal Singer | EurekAlert!
Further information:
http://www.sandia.gov

More articles from Process Engineering:

nachricht Quick, Precise, but not Cold
17.05.2017 | Fraunhofer-Institut für Lasertechnik ILT

nachricht A laser for divers
03.05.2017 | Laser Zentrum Hannover e.V.

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Supersensitive through quantum entanglement

28.06.2017 | Physics and Astronomy

X-ray photoelectron spectroscopy under real ambient pressure conditions

28.06.2017 | Physics and Astronomy

Mice provide insight into genetics of autism spectrum disorders

28.06.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>