Featured Research

from universities, journals, and other organizations

Ratchet Effect Solves One Problem In Superconductors

Date:
July 26, 1999
Source:
University Of Notre Dame
Summary:
A serious obstacle impeding the application of superconductor devices can be overcome by employing a common mechanism, the so-called "ratchet effect," according to a report by a team of in the July 22 publication of Nature.

A serious obstacle impeding the application of superconductor devices can be overcome by employing a common mechanism, the so-called "ratchet effect," according to a report by a team of in the July 22 publication of Nature.

Related Articles


According to Albert-Laszlo Barabasi, associate professor of physics at the University of Notre Dame and principal investigator, vortices - lines of trapped magnetic flux - dissipate energy and generate internal noise in superconductive devices. And unfortunately, they can be induced in such devices by fields as small as the Earth's magnetic field.

Until now, many methods have been used to attempt to overcome the problem. But Barabasi argues that the most desirable method would be to remove vortices altogether from the bulk of the superconductor. Previously, though, there was no known way to do this.

In the Nature article, Barabasi and his team propose applying an alternating current to a superconductor that has been patterned asymmetrically in a kind of sawtooth or ratchet-like pattern. The pattern, working in concert with the alternating current, directs the vortex away from the superconductive device.

According to Barabasi, the ratchet effect has been studied mainly in biological contexts, such as molecular motors, but other previous applications have included particle separators and smoothing surfaces in molecular beam epitaxy.

In the report, Barabasi's team demonstrates theoretically how this would work in low-temperature superconductors although the effect would be the same as well in high-temperature superconductors.

This solution is attractive because it does not require sophisticated material processing to make it work. "The patterning technology is rather standard," Barabasi says. "Similar patterning is done regularly during mass production conditions, such as in computer chip fabrication."

When AC current is not desired for specific applications AC current can be used to flush out vortices before the actual application begins, Barabasi explains. Otherwise, if the superconducting device is driven by alternating current for the desired application, the vortices will be eliminated continuously during the normal operation of the device.


Story Source:

The above story is based on materials provided by University Of Notre Dame. Note: Materials may be edited for content and length.


Cite This Page:

University Of Notre Dame. "Ratchet Effect Solves One Problem In Superconductors." ScienceDaily. ScienceDaily, 26 July 1999. <www.sciencedaily.com/releases/1999/07/990726070712.htm>.
University Of Notre Dame. (1999, July 26). Ratchet Effect Solves One Problem In Superconductors. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/1999/07/990726070712.htm
University Of Notre Dame. "Ratchet Effect Solves One Problem In Superconductors." ScienceDaily. www.sciencedaily.com/releases/1999/07/990726070712.htm (accessed January 29, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Thursday, January 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Tesla 'Insane Mode' Gives Unsuspecting Passengers the Ride of Their Life

Tesla 'Insane Mode' Gives Unsuspecting Passengers the Ride of Their Life

RightThisMinute (Jan. 29, 2015) — If your car has an "Insane Mode" then you know it&apos;s fast. Well, these unsuspecting passengers were in for one insane ride when they hit the button. Tesla cars are awesome. Video provided by RightThisMinute
Powered by NewsLook.com
Now Bill Gates Is 'Concerned' About Artificial Intelligence

Now Bill Gates Is 'Concerned' About Artificial Intelligence

Newsy (Jan. 29, 2015) — Bill Gates joins the list of tech moguls scared of super-intelligent machines. He says more people should be concerned, but why? Video provided by Newsy
Powered by NewsLook.com
Senate Passes Bill for Keystone XL Pipeline

Senate Passes Bill for Keystone XL Pipeline

AP (Jan. 29, 2015) — The Republican-controlled Senate has passed a bipartisan bill approving construction of the Keystone XL oil pipeline. (Jan. 29) Video provided by AP
Powered by NewsLook.com
Two Stunt Pilots Perform Incredibly Close Flyby

Two Stunt Pilots Perform Incredibly Close Flyby

Rumble (Jan. 29, 2015) — Two pilots from &apos;Escuadrilla Argentina de Acrobacia Aιrea&apos; perform an incredibly low altitude flyby stunt during a recent show exhibition in Argentina. Check it out! Video provided by Rumble
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins