Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

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

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

Spintronics

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

Pb islands in a sea of graphene magnetise the material of the future December 16th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

Researchers create & control spin waves, lifting prospects for enhanced info processing November 17th, 2014

Chip Technology

Instant-start computers possible with new breakthrough December 19th, 2014

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

Pb islands in a sea of graphene magnetise the material of the future December 16th, 2014

Stanford team combines logic, memory to build a 'high-rise' chip: Today circuit cards are laid out like single-story towns; Futuristic architecture builds layers of logic and memory into skyscraper chips that would be smaller, faster, cheaper -- and taller December 15th, 2014

Memory Technology

Instant-start computers possible with new breakthrough December 19th, 2014

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

Stanford team combines logic, memory to build a 'high-rise' chip: Today circuit cards are laid out like single-story towns; Futuristic architecture builds layers of logic and memory into skyscraper chips that would be smaller, faster, cheaper -- and taller December 15th, 2014

Graphene layer reads optical information from nanodiamonds electronically: Possible read head for quantum computers December 1st, 2014

Discoveries

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Iranian Scientists Use Nanotechnology to Increase Power, Energy of Supercapacitors December 18th, 2014

Announcements

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE