Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Doubling up improves nanoring design

04.11.2015

A new nanoring design shows potential for generating short magnetic pulses and could be used to explore magnetic switching in materials.

A bimetallic nanoring that generates a short magnetic pulse when irradiated by a laser pulse has been theoretically studied by researchers at Singapore's Agency for Science, Technology and Research (A*STAR). It shows exciting potential for investigating magnetic switching and realizing rapid data storage [1].


When a light pulse (black arrow indicates its electric field and blue arrow shows propagation direction) is irradiated on a nanoring made of nickel and gold on silica substrate (blue), the nanoring generates a magnetic pulse via the thermoelectric effect.

Adapted from Ref. 1 and licensed under CC-BY-3.0 © 2015 G. Vienne et al.

Unlike their electrical and optical equivalents, ultrashort magnetic pulses have proved very difficult to generate. These pulses are needed to explore magnetic switching in materials — a process that underpins virtually all of today’s data storage technology. However, most methods for generating magnetic pulses use large-scale particle accelerators or are limited to specific materials and do not produce tightly confined magnetic fields.

Now, Guillaume Vienne and colleagues at the A*STAR Data Storage Institute have theoretically proposed a nanoring that consists of four alternating gold and nickel sectors (see image). Their calculations predict that this nanoring will generate magnetic pulses shorter than a trillionth of a second when irradiated by an ultrashort laser pulse.

The ring is essentially a nanoscale version of the setup used by physicist Thomas Seebeck in 1821 when he discovered that a temperature difference produces an electric voltage in certain materials — now known as the thermoelectric effect. The nanoring operates in a similar way to Seebeck’s setup in that heating it produces an uneven temperature distribution, which results in current flow and generates a magnetic field.

The nanoring is heated by irradiation with a laser pulse. Its small size gives rise to resonant collective oscillations of conduction electrons, known as plasmon resonance. This results in efficient and uneven heating, producing hot and cool spots in the ring between which currents flow as a result of the thermoelectric effect. Finally, these currents generate a magnetic pulse.

Vienne sees the nanoring as being unique. “There simply isn’t any source that produces a magnetic field that is so localized in both time and space. So it’s a kind of a new object,” he enthuses.

The four-sector nanoring has two significant advantages over a previous design that had only two sectors. It generates a higher current and hence a higher magnetic field. In addition, the four-sector nanoring has a lower maximum temperature, which is fortunate since the ring will melt if its maximum temperature exceeds its melting point.

The A*STAR team is currently collaborating with scientists at Southampton University in the United Kingdom to fabricate and characterize such a nanoring.

The researchers are enthusiastic about its potential. “There is much debate about how fast magnetization can be switched,” says Vienne. “Our nanoring should advance that debate.”

The A*STAR-affiliated researchers contributing to this research are from the Data Storage Institute. For more information about the team’s research, please visit the Advanced Concepts and Nanotechnology webpage.

Reference

[1] Vienne, G., Chen, X., Teh, Y. S., Ng, Y. J., Chia, N. O. & Ooi, C. P. Novel layout of a bi-metallic nanoring for magnetic field pulse generation from light. New Journal of Physics 17, 013409 (2015).


Associated links
Original article from A*STAR Research

A*STAR Research | Research SEA
Further information:
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Barely scratching the surface: A new way to make robust membranes
13.12.2018 | DOE/Argonne National Laboratory

nachricht Topological material switched off and on for the first time
11.12.2018 | ARC Centre of Excellence in Future Low-Energy Electronics Technologies

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Data use draining your battery? Tiny device to speed up memory while also saving power

The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.

Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...

Im Focus: An energy-efficient way to stay warm: Sew high-tech heating patches to your clothes

Personal patches could reduce energy waste in buildings, Rutgers-led study says

What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

Data use draining your battery? Tiny device to speed up memory while also saving power

14.12.2018 | Power and Electrical Engineering

Tangled magnetic fields power cosmic particle accelerators

14.12.2018 | Physics and Astronomy

In search of missing worlds, Hubble finds a fast evaporating exoplanet

14.12.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>