Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Researchers create nanoscale spinning magnetic droplets

Abstract:
Researchers have successfully created a magnetic soliton - a nano-sized, spinning droplet that was first theorized 35 years ago. These solitons have implications for the creation of magnetic, spin-based computers.

Researchers create nanoscale spinning magnetic droplets

Raleigh, NC | Posted on March 15th, 2013

Solitons are waves, localized in space, that preserve their size and momentum. They were first observed in water. Solitons composed of light have proved useful for long distance, high speed information transmission. But droplet solitons had never been observed in a magnetic environment, although scientists believed they could exist there.

North Carolina State University mathematician Mark Hoefer had created a mathematical model of what such a soliton might look like. When physicist Johan Åkerman and graduate student Majid Mohseni from Sweden's Royal Institute of Technology (KTH) and the University of Gothenburg got experimental data back that seemed to correspond with Hoefer's model, they decided to try and confirm the existence of a magnetic droplet soliton.

The physicists used a nanoscale wire to deliver a small amount of DC current to a magnet. All electrons possess angular momentum in the form of spin. Picture a spinning top. Angular momentum is what keeps that top upright, or pointed in a particular direction. Each electron within the magnet is like a spinning top, and in magnets, all of the electrons' spins are aligned in roughly the same way. Putting DC current into that group of electrons injects energy into the magnetic system, changing the spin of the local electrons in that immediate area. The spins of the electrons then precess, or "lean" like a top does when it is no longer upright, which causes a tiny spinning magnetic droplet, or soliton, to form.

The scientists were able to detect the soliton's presence by measuring the frequency of the precession. They observed the soliton's unique signature - a pronounced drop in frequency coupled with a large jump in power output - and knew they had been successful.

"These solitons are called 'dissipative,' because magnets want to dissipate energy from precession," Hoefer says. "They maintain their stability by balancing the amount of energy coming into the system via the DC current with the amount going out, and by balancing the nonlinearity, or amplitude, with dispersion, or a tendency to spread out."

In addition to demonstrating the existence of these solitons, the researchers also noted some other interesting properties of the solitons, including oscillatory motion and a periodic deformation they referred to as "breathing."

The researchers' findings appear in Science.

"Solitons are excellent transmitters of information, so finding them in a magnetic system could have all sorts of implications for spin-based computing, from new ways to process information to higher density hard drives," Hoefer says.

S. M. Mohseni, S. R. Sani, J. Persson and T. N. Anh Nguyen fabricated the devices. S. M. Mohseni, S. Chung, and R. K. Dumas carried out device characterization. S. M. Mohseni, Ye. Pogoryelov, P. K. Muduli, A. Eklund, R. K. Dumas, S. Bonetti, A. Deac, M. Hoefer, and J. Åkerman carried out the analysis. E. Iacocca and M. Hoefer performed micromagnetic simulations. All authors co-wrote the manuscript.

-peake-

Note to editors:

"Spin Torque-Generated Magnetic Droplet Solitons"

Published: March 15, 2013 in Science

Authors: S.M. Mohseni, S.R. Sani, N. Anh Nguyen, S. Chung, A. Eklund, S. Bonetti, J. Akerman, Royal Institute of Technology, Sweden; J. Persson, NanOsc AB, Sweden; Ye. Pogoryelov, P.K. Muduli, E. Iacocca, R. K. Dumas, University of Gothenburg, Sweden; A. Deac, Institute of Ion Beam Physics and Materials Research, Germany; M.A. Hoefer, North Carolina State University

####

For more information, please click here

Contacts:
Tracey Peake

919-515-6142

Copyright © North Carolina State University

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

Chemists Cook up New Nanomaterial and Imaging Method: Nanomaterials can store all kinds of things, including energy, drugs and other cargo January 19th, 2017

National Space Society Congratulates SpaceX on the Falcon 9's Return to Flight January 19th, 2017

Eric Berger Wins the National Space Society's 2017 Space Pioneer Award for Mass Media January 19th, 2017

Nanometrics to Announce Fourth Quarter and Full Year Financial Results on February 7, 2017 January 19th, 2017

Spintronics

First experimental proof of a 70 year old physics theory: First observation of magnetic phase transition in 2-D materials, as predicted by the Nobel winner Onsager in 1943 January 6th, 2017

Investigations of the skyrmion Hall effect reveal surprising results: One step further towards the application of skyrmions in spintronic devices December 28th, 2016

Electron highway inside crystal December 12th, 2016

Making spintronic neurons sing in unison November 18th, 2016

Chip Technology

Nanometrics to Announce Fourth Quarter and Full Year Financial Results on February 7, 2017 January 19th, 2017

Dressing a metal in various colors: DGIST research developed a technology to coat metal with several nanometers of semiconducting materials January 17th, 2017

Seeing the quantum future... literally: What if big data could help you see the future and prevent your mobile phone from breaking before it happened? January 16th, 2017

NUS researchers achieve major breakthrough in flexible electronics: New classes of printable electrically conducting polymer materials make better electrodes for plastic electronics and advanced semiconductor devices January 14th, 2017

Memory Technology

Investigations of the skyrmion Hall effect reveal surprising results: One step further towards the application of skyrmions in spintronic devices December 28th, 2016

New material with ferroelectricity and ferromagnetism may lead to better computer memory December 21st, 2016

Characterization of magnetic nanovortices simplified December 21st, 2016

New technology of ultrahigh density optical storage researched at Kazan University: The ever-growing demand for storage devices stimulates scientists to find new ways of improving the performance of existing technologies November 30th, 2016

Discoveries

Chemists Cook up New Nanomaterial and Imaging Method: Nanomaterials can store all kinds of things, including energy, drugs and other cargo January 19th, 2017

'5-D protein fingerprinting' could give insights into Alzheimer's, Parkinson's January 19th, 2017

Strength of hair inspires new materials for body armor January 18th, 2017

Self-assembling particles brighten future of LED lighting January 18th, 2017

Announcements

Chemists Cook up New Nanomaterial and Imaging Method: Nanomaterials can store all kinds of things, including energy, drugs and other cargo January 19th, 2017

National Space Society Congratulates SpaceX on the Falcon 9's Return to Flight January 19th, 2017

Eric Berger Wins the National Space Society's 2017 Space Pioneer Award for Mass Media January 19th, 2017

Nanometrics to Announce Fourth Quarter and Full Year Financial Results on February 7, 2017 January 19th, 2017

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