Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Vortices get organized: Exotic entities that arrange into a crystalline structure at near room-temperature could lead to a new approach to electronic memory

Figure 1: In a skyrmion (left) the electron spins, represented as arrows about which the electrons are rotating, are arranged such they map onto the surface of a sphere (right). 
Reproduced in part from Ref. 1 © 2011 X. Z. Yu et al.
Figure 1: In a skyrmion (left) the electron spins, represented as arrows about which the electrons are rotating, are arranged such they map onto the surface of a sphere (right).

Reproduced in part from Ref. 1 © 2011 X. Z. Yu et al.

Abstract:
A crystal consisting not of atoms but exotic swirling magnetic entities, called skyrmions, has been identified at near room-temperature by Yoshinori Tokura of the RIKEN Advanced Science Institute, Wako, and his colleagues from several other institutes in Japan1. Previous observations of a skyrmion crystal state, in transition-metal-silicide materials, have been at cryogenic temperatures below 40 kelvin. The existence of skyrmions at room temperature improves the practicality of harnessing their potential for use in novel computer memories.

Vortices get organized: Exotic entities that arrange into a crystalline structure at near room-temperature could lead to a new approach to electronic memory

Wako, Japan | Posted on February 26th, 2011

Skyrmions are formed on some surfaces when the spins of the electrons—think of an arrow about which each electron rotates—collectively arrange such that they wrap around the surface of a sphere (Fig. 1). This pattern spirals in such a way that the spins on the outside point up whereas those at the core point down. This collection of spins can display many properties associated with a single particle. "A skyrmion crystal is the periodic array of these particle-like entities," explains Tokura.

Earlier neutron-scattering experiments by other researchers identified this unusual effect in both iron-cobalt silicide and manganese silicide. Tokura and his team, however, investigated skyrmions in iron germanium. This alloy has the same cubic atomic crystal structure as iron-cobalt silicide and manganese silicide—the two materials in which skyrmions have been observed at low temperatures; but it remains in the necessary magnetic structure up to a much higher temperature.

Using a transmission electron microscope, the researchers probed the magnetization on the surface of polished layers of the iron-germanium alloy. They found tell-tale signs of skyrmions at temperatures up to 260 kelvin, particularly when they applied a small magnetic field perpendicularly to the surface.

This material also provides an excellent opportunity to investigate the stability of the skyrmion crystal, the team notes. Previous studies focused on very thin layers of material. Tokura and his team investigated the influence of film thickness and found that for thicknesses greater than the distance between skyrmions, about 75 nanometers in this case, the skyrmion crystal state is suppressed and a more conventional ferromagnetic phase starts to dominate.

Skyrmions could play an important role in the development of spintronics—using electron spin to carry information in the same way that electron charge is used in conventional electronics. "Skyrmion crystals could also be applied in memory and logic devices," says Tokura. The advantage over conventional systems is that control is achieved using electric, rather than magnetic fields, which is known to be more efficient.

The corresponding author for this highlight is based at the Emergent Materials Department, RIKEN Advanced Science Institute

####

About Riken Research
RIKEN is one of Japan's largest research organizations with institutes and centers in locations throughout Japan. RIKEN's 3000+ researchers publish several hundred research articles in top scientific and technical journals every year across a broad spectrum of disciplines in physics, chemistry, biology, medicine, engineering and in many areas of technology, and the number of articles is growing year on year.

For more information, please click here

Contacts:
2-1 Hirosawa
Wako, Saitama 351-0198 Japan
+81-(0)48-462-1111

Copyright © Riken Research

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 Links

Yu, X.Z., Kanazawa, N., Onose, Y., Kimoto, K., Zhang, W.Z., Ishiwata, S., Matsui, Y. & Tokura, Y. Near room-temperature formation of a skyrmion crystal in thin-films of the helimagnet FeGe. Nature Materials 10, 106–109 (2011).

Related News Press

News and information

The International Space Elevator Consortium (ISEC) is proud to announce the 2014 Space Elevator Conference! This annual event will be held at the Museum of Flight in Seattle, Washington from Friday, August 22nd through Sunday, August 24th August 19th, 2014

KaSAM-2014 International Conference (September 7-10, 2014, Kathmandu, Nepal) August 19th, 2014

Success in Intracellular Imaging of Cesium Distribution in Plants Used for Cesium Absorption August 19th, 2014

Electrical engineers take major step toward photonic circuits: Team invents non-metallic metamaterial that enables them to 'compress' and contain light August 19th, 2014

Laboratories

Promising Ferroelectric Materials Suffer From Unexpected Electric Polarizations: Brookhaven Lab scientists find surprising locked charge polarizations that impede performance in next-gen materials that could otherwise revolutionize data-driven devices August 18th, 2014

Research of Empa scientists on the cover of "Nature": Synthesis of structurally pure carbon nanotubes using molecular seeds August 7th, 2014

FEI Reports New Advances in Neuroscience in Collaboration with NIH: Using cryo-electron microscopy, researchers determine the structural mechanism of glutamate receptors – an important insight to the brain’s memory formation and learning August 4th, 2014

New Method Provides Nanoscale Details of Electrochemical Reactions in Electric Vehicle Battery Materials August 4th, 2014

Memory Technology

Promising Ferroelectric Materials Suffer From Unexpected Electric Polarizations: Brookhaven Lab scientists find surprising locked charge polarizations that impede performance in next-gen materials that could otherwise revolutionize data-driven devices August 18th, 2014

Can our computers continue to get smaller and more powerful? University of Michigan computer scientist reviews frontier technologies to determine fundamental limits of computer scaling August 13th, 2014

An Inkjet-Printed Field-Effect Transistor for Label-Free Biosensing August 11th, 2014

Rice's silicon oxide memories catch manufacturers' eye: Use of porous silicon oxide reduces forming voltage, improves manufacturability July 10th, 2014

Self Assembly

Nanocubes Get in a Twist : Competing forces coax nanocubes into helical structures August 11th, 2014

Self-assembly of gold nanoparticles into small clusters August 4th, 2014

Carnegie Mellon Chemists Create Nanofibers Using Unprecedented New Method July 31st, 2014

Berkeley Lab researchers create nanoparticle thin films that self-assemble in 1 minute June 9th, 2014

Discoveries

Success in Intracellular Imaging of Cesium Distribution in Plants Used for Cesium Absorption August 19th, 2014

Сalculations with Nanoscale Smart Particles August 19th, 2014

Electrical engineers take major step toward photonic circuits: Team invents non-metallic metamaterial that enables them to 'compress' and contain light August 19th, 2014

Graphene rubber bands could stretch limits of current healthcare, new research finds August 19th, 2014

Announcements

Сalculations with Nanoscale Smart Particles August 19th, 2014

Life on Mars? Implications of a newly discovered mineral-rich structure August 19th, 2014

Harris & Harris Group Letter to Shareholders on Website August 19th, 2014

Electrical engineers take major step toward photonic circuits: Team invents non-metallic metamaterial that enables them to 'compress' and contain light August 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