Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Tiny magnets mimic steam, water and ice

21.09.2015

Researchers at the Paul Scherrer Institute (PSI) created a synthetic material out of 1 billion tiny magnets. Astonishingly, it now appears that the magnetic properties of this so-called metamaterial change with the temperature, so that it can take on different states; just like water has a gaseous, liquid and a solid state. This material made of nanomagnets might well be refined for electronic applications of the future – such as for more efficient information transfer.

A synthetic material – created from 1 billion nanomagnets – assumes different aggregate states depending on the temperature: the so-called metamaterial exhibits phase transitions, much like those between steam, water and ice. This effect was observed by a team of researchers headed by Laura Heyderman from PSI.


PSI researchers have created a synthetic magnetic metamaterial. Depending on the temperature it behaves similarly to ice, water and steam.

Paul Scherrer Institut/Luca Anghinolfi

“We were surprised and excited,” explains Heyderman. “Only complex systems are able to display phase transitions.” And as complex systems can provide new kinds of information transfer, the result of the new study also reveals that the PSI researchers’ metamaterial would be a potential candidate here.

The major advantage of the synthetic metamaterial is that it can be customised virtually freely. While the individual atoms in a natural material cannot be rearranged with pinpoint precision on such a grand scale, the researchers say that this is possible with the nanomagnets.

Honeycomb of nanomagnets

The magnets are only 63 nanometres long and shaped roughly like grains of rice. The researchers used a highly advanced technique to place 1 billion of these tiny grains on a flat substrate to form a large-scale honeycomb pattern. The nanomagnets covered a total area of five by five millimetres.

Thanks to a special measuring technique, the scientists initially studied the collective magnetic behaviour of their metamaterial at room temperature. Here there was no order in the magnetic orientation: the magnetic north and south poles pointed randomly in one direction or another.

When the researchers cooled the metamaterial gradually and constantly, however, they reached a point where a higher order appeared: the tiny magnets now noticed each other more than before. As the temperature fell further, there was another change towards an even higher order, in which the magnetic arrangement appeared almost frozen.

The long-range order of water molecules increases in a similar way at the moment when water freezes into ice. “We were fascinated by the fact that our synthetic material displayed this everyday phenomenon of a phase transition,” says Heyderman.

Metamaterial can be customised

In the next step, the researchers might influence these magnetic phase transitions by altering the size, shape and arrangement of the nanomagnets. This enables the creation of new states of matter, which could also give rise to applications: “The beauty of it all: tailored phase transitions could enable metamaterials to be adapted specifically for different needs in future,” explains Heyderman.

Besides its potential use in information transfer, the metamaterial might also prove useful in data storage or for sensors that measure magnetic fields. Very generally it could be used in spintronics, so in a promising future development in electronics for novel computer technology.

The measurements the researchers used to reveal the magnetic orientation of the nanomagnets, and therefore the properties of the metamaterial, can only be conducted exclusively at PSI. The equipment at the SμS, which is unique worldwide, supplies beams from exotic elementary particles called muons, which can be used to study nanomagnetic properties. The project took place in collaboration with a research group headed by Stephen Lee from the University of St Andrews, Scotland.

Text: Paul Scherrer Institut/Laura Hennemann

About PSI

The Paul Scherrer Institute (PSI) develops, builds and operates large, complex research facilities, and makes them available to the national and international research community. The Institute's own principle research interests are matter and material, energy and the environment, and human health. Educating young people is a key priority at PSI, which is why around a quarter of our staff are postdocs, doctoral students or undergraduates. PSI employs a total of 1,900 people, making it the largest research institute in Switzerland. Its annual budget amounts to around CHF 350 million.

Contact

Prof. Dr Laura Heyderman,
Laboratory of Micro- and Nanotechnology, Paul Scherrer Institute; telephone: +41 56 310 2613, e-mail: laura.heyderman@psi.ch

Dr. Hubertus Luetkens,
Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute; telephone: +41 56 310 4450, e-mail: hubertus.luetkens@psi.ch

Dr. Peter Derlet,
Solid State Theory Group, Paul Scherrer Institute; telephone: +41 56 310 3164, e-mail: peter.derlet@psi.ch

Original publication

Thermodynamic phase transitions in a frustrated magnetic metamaterial
L. Anghinolfi, H. Luetkens, J. Perron, M.G. Flokstra, O. Sendetskyi, A. Suter, T. Prokscha, P.M. Derlet, S.L. Lee, and L.J. Heyderman, Nature Communications, 21 September 2015, doi: 10.1038/ncomms9278 (Link: http://dx.doi.org/10.1038/ncomms9278)

Weitere Informationen:

http://Original press release at: http://psi.ch/y424
http://Micro- and Nanotechnology: http://www.psi.ch/media/micro-and-nanotechnology
http://Research Using Muons: http://www.psi.ch/media/research-using-muons

Dagmar Baroke | idw - Informationsdienst Wissenschaft

More articles from Physics and Astronomy:

nachricht New NASA study improves search for habitable worlds
20.10.2017 | NASA/Goddard Space Flight Center

nachricht Physics boosts artificial intelligence methods
19.10.2017 | California Institute of Technology

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>