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 approach to revolutionize the production of molecular hydrogen
22.05.2017 | Technische Universität Dresden

nachricht Photocatalyst makes hydrogen production 10 times more efficient
19.05.2017 | Kobe University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

Im Focus: Bacteria harness the lotus effect to protect themselves

Biofilms: Researchers find the causes of water-repelling properties

Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...

Im Focus: Hydrogen Bonds Directly Detected for the First Time

For the first time, scientists have succeeded in studying the strength of hydrogen bonds in a single molecule using an atomic force microscope. Researchers from the University of Basel’s Swiss Nanoscience Institute network have reported the results in the journal Science Advances.

Hydrogen is the most common element in the universe and is an integral part of almost all organic compounds. Molecules and sections of macromolecules are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

Innovation 4.0: Shaping a humane fourth industrial revolution

17.05.2017 | Event News

Media accreditation opens for historic year at European Health Forum Gastein

16.05.2017 | Event News

 
Latest News

New approach to revolutionize the production of molecular hydrogen

22.05.2017 | Materials Sciences

Scientists enlist engineered protein to battle the MERS virus

22.05.2017 | Life Sciences

Experts explain origins of topographic relief on Earth, Mars and Titan

22.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>