Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Scientists Create Nano-Patterned Superconducting Thin Films

A fragment of a superconducting thin film patterned with nano-loops measuring 150 nanometers on a side (small) and 500 nanometers on a side (large), where the nano wires making up each loop have a diameter of 25 nanometers.
A fragment of a superconducting thin film patterned with nano-loops measuring 150 nanometers on a side (small) and 500 nanometers on a side (large), where the nano wires making up each loop have a diameter of 25 nanometers.

Abstract:
Material's fluctuating response to a magnetic field could lead to switchable superconducting wires

Scientists Create Nano-Patterned Superconducting Thin Films

Upton, NY | Posted on June 14th, 2010

A team of scientists from Bar-Ilan University, Israel, and the U.S. Department of Energy's (DOE) Brookhaven National Laboratory has fabricated thin films patterned with large arrays of nanowires and loops that are superconducting able to carry electric current with no resistance when cooled below about 30 kelvin (-243 degrees Celsius). Even more interesting, the scientists showed they could change the material's electrical resistance in an unexpected way by placing the material in an external magnetic field.

"Such superconducting nanowires and nano-loops might eventually be useful for new electronic devices that is the long-term vision," said Brookhaven Lab physicist Ivan Bozovic, who synthesized the superconducting films. "That is the long-term vision."

He and his collaborators describe the research in Nature Nanotechnology, published online June 13, 2010.

It has been a long-standing dream to fabricate superconducting nano-scale wires for faster, more powerful electronics. However, this has turned out to be very difficult if not impossible with conventional superconductors because the minimal size for the sample to be superconducting known as the coherence length is large. For example, in the case of niobium, the most widely used superconductor, it is about 40 nanometers. Very thin nano-wires made of such materials wouldn't act as superconductors.

However, in layered copper-oxide superconductors, the coherence length is much smaller about one or two nanometers within the copper-oxide plane, and as small as a tenth of a nanometer out-of-plane. The fact that these materials operate at warmer temperatures, reducing the need for costly cooling, makes them even more attractive for real-world applications.

To see if they could achieve superconductivity in a thin film material etched to form a pattern of "wires" much like the circuits etched into computer chips the Brookhaven team started by using a precision technique for making superconducting thin films atomic layer by layer. They used molecular beam epitaxy to build a material with alternating layers of copper-oxide and lanthanum and strontium. Bozovic's team had previously used this technique to produce thin films that retain superconductivity within a single copper-oxide layer.

Then the team at Bar-Ilan used electron-beam lithography to "etch" a pattern of thousands of loops into the surface of the material. The thickness, or diameter, of the "nanowires" forming the sides of these loops was mere 25 nanometers, while the lengths ranged from 150 to 500 nanometers. Measurements of electrical resistance of the patterned arrays showed that they were indeed superconducting when cooled below about 30 K.

When the scientists applied an external magnetic field perpendicular to the loops, they found that the loop resistance did not keep increasing steadily with the field strength, but rather changed up and down in an oscillatory manner.

"These oscillations in resistance have a large amplitude, and their frequency corresponds to discrete units (quanta) of magnetic flux the measure of the strength of the magnetic field piercing the loops," Bozovic said. "A material with such a discrete, switchable form of magneto-resistance especially from the superconducting to the non-superconducting state could be extremely useful for engineering new devices."

The observed frequency of the oscillations in resistance may also have implications for understanding the mechanism by which copper-oxide materials become superconductors in the first place. The current findings seem to rule out certain theoretical models that propose that an ordered alignment of charge carriers known as "stripes" is essential to superconductivity in copper-oxide compounds. A better understanding of the mechanism of superconductivity could lead to even more advances in designing new materials for practical applications.

The Brookhaven scientists' role in this research was supported by DOE's Office of Science. The work was also funded by the German Research Foundation through a German-Israeli cooperative agreement, and by a scholarship granted by the Israel Ministry of Science.



####

About Brookhaven National Laboratory
One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

For more information, please click here

Contacts:
Karen McNulty Walsh

(631)344-8350

Peter Genzer

(631) 344-3174

Copyright © Brookhaven National Laboratory

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Metal oxide sandwiches: New option to manipulate properties of interfaces February 8th, 2016

Canadian physicists discover new properties of superconductivity February 8th, 2016

Leading bugs to the death chamber: A kinder face of cholesterol February 8th, 2016

From allergens to anodes: Pollen derived battery electrodes February 8th, 2016

Thin films

IBS report electric transport across molybdenum disulfide grain boundaries: Scientific team from CINAP/IBS identifies previously undiscovered differences in grain boundaries January 28th, 2016

Weaving a new story for COFS and MOFs: First materials to be woven at the atomic and molecular levels created at Berkeley January 24th, 2016

Teijin to Participate in Nano Tech 2016 January 21st, 2016

Flexible film may lead to phone-sized cancer detector January 18th, 2016

Govt.-Legislation/Regulation/Funding/Policy

Canadian physicists discover new properties of superconductivity February 8th, 2016

Leading bugs to the death chamber: A kinder face of cholesterol February 8th, 2016

From allergens to anodes: Pollen derived battery electrodes February 8th, 2016

The iron stepping stones to better wearable tech without semiconductors February 8th, 2016

Possible Futures

From allergens to anodes: Pollen derived battery electrodes February 8th, 2016

Host-guest nanowires for efficient water splitting and solar energy storage February 7th, 2016

Graphene is strong, but is it tough? Berkeley Lab scientists find that polycrystalline graphene is not very resistant to fracture February 7th, 2016

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Academic/Education

COD Grad Begins Postdoctoral Fellow at Harvard University: Marsela Jorgolli's Passion for Physics Has Led to a Decade of Academic Research That Continues at Harvard University as a Postdoctoral Fellow February 2nd, 2016

Heriot-Watt's Institute of Photonics & Quantum Sciences uses the Deben Microtest 2 kN tensile stage to characterise ceramics and engineering plastics January 21st, 2016

Multiple uses for the JPK NanoWizard AFM system in the Smart Interfaces in Environmental Nanotechnology Group at the University of Illinois at Urbana-Champaign January 20th, 2016

BioSolar Extends Research Agreement With UCSB for Next Phase of Its Super Battery Technology: Development Effort to Continue Under the Supervision of Nobel Laureate, Dr. Alan Heeger January 13th, 2016

Announcements

Metal oxide sandwiches: New option to manipulate properties of interfaces February 8th, 2016

Canadian physicists discover new properties of superconductivity February 8th, 2016

Leading bugs to the death chamber: A kinder face of cholesterol February 8th, 2016

From allergens to anodes: Pollen derived battery electrodes February 8th, 2016

Research partnerships

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Polar vortices observed in ferroelectric: New state of matter holds promise for ultracompact data storage and processing February 4th, 2016

Spin dynamics in an atomically thin semi-conductor February 1st, 2016

Graphene shown to safely interact with neurons in the brain January 31st, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic