Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Magnetic spin details may lead to new devices

20.01.2006


An unusual pool of scientific talent at the U.S. Department of Energy’s Argonne National Laboratory, combined with new nanofabrication and nanocharacterization instruments, is helping to open a new frontier in electronics, to be made up of very small and very fast devices.


SPIN RESEARCH – Argonne researcher Sam Bader with a new instrument to measure spin resonance frequencies, developed by Argonne senior scientist Frank



A new discovery by this group opens a path to new computer technologies and related devices, and could drive entire industries into the future, the researchers say.

The researchers learned that swirling spin structures called magnetic vortices, when trapped within lithographically patterned ferromagnetic structures, behave in novel ways. In a nickel-iron alloy, the two vortices swirl in opposite directions, one clockwise and the other counterclockwise. However, the researchers discovered that the magnetic polarity of the central core of the vortices, like the eye of a hurricane, controlled the time-evolution of the magnetic properties, not the swirling direction.


The material being studied is about one micron in size, and the area of the vortex core is about 10 nanometers in size. For comparison, the period at the end of this sentence is about 100 microns or 100,000 nanometers in diameter.

Group leader Sam Bader, an Argonne scientist for more than 30 years, explained that the work could lead to the next generation of electronic devices. “When the first computer hard disk was introduced 50 years ago, it required a rather large size to store each bit of digital information. On today’s computer disks, the corresponding size is about one-50-millionth of that needed in the original disks. We are now moving well into the nanoscale range, and nanomagnetism is one of the real drivers of the nanotechnology field.”

The beauty of nanoscience, Bader said, is that researchers can take conventional materials, such as the nickel-iron alloy, reduce them to the nanoscale and create whole new properties. “Thinking far into the future, for example, we can envision circuits where the flow of spin, not the flow of electrical charge, will operate computers and other electronic devices while saving wasted heat energy that is generated in present-day devices.”

As with other materials at the nanoscale, Bader said, nanomagnets take on new properties, some of them unpredictable.

Understanding that unpredictability and underlying physics is important to researchers developing the new technology, said Argonne scientist Val Novosad. “With this very small array of spins, where each atom has a magnetic moment, the vortex core responds to stimuli by traveling in spiral trajectories.”

The researchers created the material in the form of an array of elliptical pancakes, each holding two vortex cores, stimulated the material with a magnetic pulse and watched the subsequent behavior.

“This first-ever reported experiment revealing unique dynamic behavior of two interacting magnetic vortices required a considerable assist from technology,” Novosad said.

Argonne senior scientist Marcos Grimsditch provided the inspiration for the novel magnetic configuration of the samples, which were fabricated using a new electron beam lithography facility to be housed at Argonne ’s Center for Nanoscale Materials, scheduled to open later this year. The tiny process could be monitored using a new instrument to measure spin resonance frequencies, developed by Argonne senior scientist Frank Fradin. And the interpretation of the experimental data was assisted by numerical modeling from Argonne post-doctoral student Kristen Buchanan, winner of a fellowship from Canada ’s Natural Science and Engineering Research Council, and the analytical theory expertise of visiting theorist Konstantin Guslienko at Argonne’s Theory Institute.

“Every step along the way was state of the art,” Bader said, “from the fabrication of the material to the measurement of the spin to the creation of software to illustrate the data through a movie.”

The research was reported in the new peer-reviewed journal,Nature Physics. The six Argonne researchers are co-authors of the article, along with Pierre Roy of Uppsala University in Sweden , a graduate student in residence at Argonne as part of his thesis research experience.

The nation’s first national laboratory, Argonne National Laboratory conducts basic and applied scientific research across a wide spectrum of disciplines, ranging from high-energy physics to climatology and biotechnology. Since 1990, Argonne has worked with more than 600 companies and numerous federal agencies and other organizations to help advance America’s scientific leadership and prepare the nation for the future. Argonne is managed by the University of Chicago for the U.S. Department of Energy’s Office of Science.

For more information, please contact Catherine Foster (630/252-5580 or cfoster@anl.gov) at Argonne.

Catherine Foster | EurekAlert!
Further information:
http://www.anl.gov

More articles from Physics and Astronomy:

nachricht Squeezing light at the nanoscale
18.06.2018 | Harvard John A. Paulson School of Engineering and Applied Sciences

nachricht The Fraunhofer IAF is a »Landmark in the Land of Ideas«
15.06.2018 | Fraunhofer-Institut für Angewandte Festkörperphysik IAF

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: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

Im Focus: Photoexcited graphene puzzle solved

A boost for graphene-based light detectors

Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...

Im Focus: Water is not the same as water

Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.

From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Novel method for investigating pore geometry in rocks

18.06.2018 | Earth Sciences

Diamond watch components

18.06.2018 | Process Engineering

New type of photosynthesis discovered

18.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>