Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Electric current moves magnetic vortices

Prof. Dr. Pfleiderer prepares a sample at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz
Prof. Dr. Pfleiderer prepares a sample at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz

Abstract:
TUM physicists discover with the help of neutrons new ways to save data

Electric current moves magnetic vortices

München, Germany | Posted on December 21st, 2010

Faster, smaller and more energy efficient - that is what tomorrow's computers should look like. This means that data needs to be written and processed faster. Physicists at the Technische Universität München (TUM) and the Universität zu Köln are now a great deal closer to that goal. The experimental physicists at the TUM set a lattice of magnetic vortices in a material in motion using electric current almost a million times weaker than in earlier studies. They observed the coupling between electric current and magnetic structure by means of measurements at the research neutron source FRM II at the TUM. The results of their work appear in the scientific journal Science.

While Peter Grünberg and Albert Fert were awarded the Nobel Prize in 2007 for research that led to significantly faster reading of data, in the past few years scientists have been concentrating on how magnetic information can be directly written to media using electric current. So far, the problem with this kind of work has been the need for extremely high currents, whose side effects nearly impossible to rein in, even in nanostructures.

A little over a year ago, Professor Christian Pfleiderer and his team at the Physics Department of the TUM discovered an entirely new magnetic structure in a crystal of manganese silicon - a lattice of magnetic vortices. The experiments in Garching were spurred by the theoretical forecasts of Professor Achim Rosch at the Universität zu Köln and Professor Rembert Duine from the Universiteit Utrecht. They were expecting new results in the field of so-called spintronics, nanoelectronic elements that use not only the electric charge of electrons to process information, but also their magnetic moment, or spin.

Christian Pfleiderer's team of scientists sent electric current through the manganese silicon. Using neutrons from FRM II, they were able to observe a twist in the magnetic vortex lattice, which they could not explain initially. More interesting than the twist was the newly discovered magnetic lattice (Science, Vol. 323, 5916 pp. 915-919, see below).

In the next step, Christian Pfleiderer and his team made further measurements at the MIRA instrument of the neutron source FRM II in an attempt to determine why the lattice twisted when a current was applied. At first, the calculations of the theoreticians contradicted the results of the experiments in Garching. "The magnetic structure twists, because the direction of the electric current is deflected extremely efficiently by quantum mechanical effects," explains Christian Pfleiderer. When an electron flies through the magnetic vortex, the electron's spin reacts to the vortex (see animation). In this way the electric current exerts a force on the magnetic vortices, which eventually begin to flow.

After further measurements, the team of Christian Pfleiderer and Achim Rosch was able to establish that the newly discovered lattice of magnetic vortexes displays properties that have been of interest in nano technology for quite some time. They are, among other things, relevant to the development of new data storage systems. Notably, the magnetic vortices are very stable and at the same time very weakly anchored in the material, so that even the weakest of electric currents can lead to movement. This will allow data to be written and processed considerably faster and more efficiently in the future.

Original publication:

F. Jonietz, S. Mühlbauer, C. Pfleiderer, A. Neubauer, W. Münzer, A. Bauer, T. Adams, R. Georgii, P. Böni, R. A. Duine, K. Everschor, M. Garst, A. Rosch, Spin Transfer Torques in MnSi at Ultra-low Current Densities, Science, 330, 6011, pp. 1648-165, DOI: 10.1126/science.1195709

Publication about the discovery:

Skyrmion Lattice in a Chiral Magnet; S. Mühlbauer, B. Binz, F. Jonietz, C. Pfleiderer, A. Rosch, A. Neubauer, R. Georgii, P. Böni, Science, Vol. 323 no. 5916 pp. 915-919, 13 February 2009. DOI: 10.1126/science.1166767

####

For more information, please click here

Contacts:
Prof. Christian Pfleiderer
Department of Physics
Technische Universität München
James-Franck-Str. 1, 85748 Garching, Germany
Tel.: +49 89 289 14720

Copyright © Technische Universitaet Muenchen

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

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Individual impurity atoms detectable in graphene April 18th, 2018

Physics

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Academic/Education

Grand Opening of UC Irvine Materials Research Institute (IMRI) to Spotlight JEOL Center for Nanoscale Solutions: Renowned Materials Scientists to Present at the 1st International Symposium on Advanced Microscopy and Spectroscopy (ISAMS) April 18th, 2018

Lifeboat Foundation funds flying 3D-printed classroom cubesats with Perlan II April 16th, 2018

SUNY Poly’s Center for Semiconductor Research in Albany Earns World-Class TÜV SÜD AMERICA INC. ISO 9001:2015 Certification: Albany NanoTech Complex Certification Assures Top-Tier Quality in Semiconductor Test Structures; Certification a First for a SUNY Campus March 6th, 2018

Luleå University of Technology is using the Deben CT5000TEC stage to perform x-ray microtomography experiments with the ZEISS Xradia 510 Versa to understand deformation and strain inside inhomogeneous materials November 7th, 2017

Spintronics

Diamonds show promise for spintronic devices: New experiments demonstrate the potential for diamond as a material for spintronics January 30th, 2018

Researchers from TU Delft combine spintronics and nanophotonics in 2-D material January 25th, 2018

ICN2 researchers compute unprecedented values for spin lifetime anisotropy in graphene November 17th, 2017

Spin current detection in quantum materials unlocks potential for alternative electronics October 15th, 2017

Nanoelectronics

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Non-toxic filamentous virus helps quickly dissipate heat generated by electronic devices April 4th, 2018

Ancient paper art, kirigami, poised to improve smart clothing: New research shows how paper-cutting can make ultra strong, stretchable electronics April 3rd, 2018

Understanding charge transfers in molecular electronics March 30th, 2018

Discoveries

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Announcements

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project