Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Observation of skyrmions (magnetic vortex structures) in a ferromagnet with centrosymmetry

27.05.2013
New knowledge for magnetic information technology

Researchers using Lorentz electron microscopy have shown that magnetic skyrmions are spontaneously formed as nanomagnetic clusters in a ferromagnetic manganese oxide with centrosymmetry.

A research group including the NIMS Surface Physics and Structure Unit, Superconducting Properties Unit and others, using Lorentz electron microscopy, has shown that magnetic skyrmions are spontaneously formed as nanomagnetic clusters in a ferromagnetic manganese oxide with centrosymmetry.

Dr. Masahiro Nagao, Researcher (also of Waseda University), Dr. Yeong-Gi So, Researcher (presently at University of Tokyo), Toru Hara, Principal Researcher, and Koji Kimoto, Unit Director, of the Surface Physics and Structure Unit, and Masaaki Isobe, Group Leader of the Superconducting Properties Unit, et al., National Institute for Materials Science (President: Sukekatsu Ushioda), have used Lorentz electron microscopy to show that magnetic skyrmions are spontaneously formed as nanomagnetic clusters in a ferromagnetic manganese oxide with centrosymmetry.

The recently discovered magnetic vortex structures known as magnetic skyrmions have been shown to have very interesting and unprecedented properties, such as a very great anomalous Hall effect and skyrmion motion under ultra-low-density currents. They have raised hopes of their application as new magnetic elements. The formation of skyrmions is thought to require the application of a magnetic field to a magnet that does not have centrosymmetry.

However, it has now been shown for the first time by direct observation with Lorentz electron microscopy that nanomagnetic clusters spontaneously form skyrmion structures even in ferromagnetic manganese oxides where the crystal structures have centrosymmetry. This result suggests the possibility that skyrmion structures might be formed even in nanomagnetic clusters and nanoparticles of various ferromagnets that do not meet the conditions conventionally deemed necessary.

The skyrmions observed in this research indicate a phenomenon in which the magnetic vortex repeatedly inverts between clockwise and counterclockwise at a certain temperature because of thermal fluctuation. It was also found, moreover, that when two skyrmions come close together, they invert to the same vortex direction in synch with each other. This result would seem to provide new knowledge for the development of magnetic elements using the interaction between skyrmions.

The result also points to a method of determining the energy needed for inverting the magnetic vortex of individual nanomagnetic clusters by Lorentz electron microscope observation. This method could potentially be applied widely with nanomagnets and nanomagnetic devices for which it is difficult to determine the energy required for magnetic inversion by ordinary measurement.

Journal information
The findings were announced in Nature Nanotechnology on April 29, 2013

Mikiko Tanifuji | Research asia research news
Further information:
http://www.nims.go.jp/eng/news/press/2013/04/p201304290.html
http://www.researchsea.com

More articles from Materials Sciences:

nachricht New design improves performance of flexible wearable electronics
23.06.2017 | North Carolina State University

nachricht Plant inspiration could lead to flexible electronics
22.06.2017 | American Chemical Society

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Supersensitive through quantum entanglement

28.06.2017 | Physics and Astronomy

X-ray photoelectron spectroscopy under real ambient pressure conditions

28.06.2017 | Physics and Astronomy

Mice provide insight into genetics of autism spectrum disorders

28.06.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>