Featured Research

from universities, journals, and other organizations

Controlling magnetic clouds in graphene

Date:
June 12, 2013
Source:
Manchester University
Summary:
Wonder material graphene can be made magnetic and its magnetism switched on and off at the press of a button, opening a new avenue towards electronics with very low energy consumption. Scientists have now shown how to create elementary magnetic moments in graphene and then switch them on and off.

Graphene's magnetism can now be controlled.
Credit: James Chapman, University of Manchester

Wonder material graphene can be made magnetic and its magnetism switched on and off at the press of a button, opening a new avenue towards electronics with very low energy consumption.

Related Articles


In a report published in Nature Communications, a University of Manchester team led by Dr Irina Grigorieva shows how to create elementary magnetic moments in graphene and then switch them on and off.

This is the first time magnetism itself has been toggled, rather than the magnetization direction being reversed.

Modern society is unimaginable without the use of magnetic materials. They have become an integral part of electronic gadgets where devices including hard disks, memory chips and sensors employ miniature magnetic components. Each micro-magnet allows a bit of information ('0' or '1') to be stored as two magnetization directions ('north' and 'south'). This area of electronics is called spintronics.

Despite huge advances, a big disappointment of spintronics has so far been its inability to deliver active devices, in which switching between the north and south directions is done in a manner similar to that used in modern transistors. This situation may dramatically change due to the latest discovery.

Graphene is a chicken wire made of carbon atoms. It is possible to remove some of these atoms which results in microscopic holes called vacancies. The Manchester scientists have shown that electrons condense around these holes into small electronic clouds, and each of them behaves like a microscopic magnet carrying one unit of magnetism, spin.

Dr Grigorieva and her team have shown that the magnetic clouds can be controllably dissipated and then condensed back.

She explains: "This breakthrough allows us to work towards transistor-like devices in which information is written down by switching graphene between its magnetic and non-magnetic states. These states can be read out either in the conventional manner by pushing an electric current through or, even better, by using a spin flow. Such transistors have been a holy grail of spintronics."

Dr Rahul Nair, who led the experimental effort, comments "Previously, one could only change a direction in which a magnet is magnetized from north to south. Now we can switch on and off the magnetism entirely.

"Graphene already attracts interest in terms of spintronics applications, and I hope that the latest discovery will make it a frontrunner."

Nobel Laureate and co-author of the paper Professor Andre Geim added: "I wonder how many more surprises graphene keeps in store. This one has come out of the blue. We have to wait and see for a few years but the switchable magnetism may lead to an impact exceeding most optimistic expectations."


Story Source:

The above story is based on materials provided by Manchester University. Note: Materials may be edited for content and length.


Journal Reference:

  1. R.R. Nair, I.-L. Tsai, M. Sepioni, O. Lehtinen, J. Keinonen, A.V. Krasheninnikov, A.H. Castro Neto, M.I. Katsnelson, A.K. Geim, I.V. Grigorieva. Dual origin of defect magnetism in graphene and its reversible switching by molecular doping. Nature Communications, 2013; 4 DOI: 10.1038/ncomms3010

Cite This Page:

Manchester University. "Controlling magnetic clouds in graphene." ScienceDaily. ScienceDaily, 12 June 2013. <www.sciencedaily.com/releases/2013/06/130612093539.htm>.
Manchester University. (2013, June 12). Controlling magnetic clouds in graphene. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2013/06/130612093539.htm
Manchester University. "Controlling magnetic clouds in graphene." ScienceDaily. www.sciencedaily.com/releases/2013/06/130612093539.htm (accessed November 28, 2014).

Share This


More From ScienceDaily



More Computers & Math News

Friday, November 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Recharge Your Phone in 30 Seconds? Israeli Firm Says It Can

Recharge Your Phone in 30 Seconds? Israeli Firm Says It Can

Reuters - Innovations Video Online (Nov. 28, 2014) With consumers demanding more and more from their mobile devices, scientists in Israel and Singapore are developing super fast-charging batteries to power them. Amy Pollock has more. Video provided by Reuters
Powered by NewsLook.com
EU Pushes Google For Worldwide Right To Be Forgotten

EU Pushes Google For Worldwide Right To Be Forgotten

Newsy (Nov. 27, 2014) Privacy regulators recommend Google expand its requested removals to apply to all its web domains. Video provided by Newsy
Powered by NewsLook.com
Predictions Of Tablets' Demise Sound Familiar

Predictions Of Tablets' Demise Sound Familiar

Newsy (Nov. 26, 2014) The tablet's days are numbered, at least according to a recent IDC report. The market-research firm paints a grim outlook for tablets. Video provided by Newsy
Powered by NewsLook.com
Today's Prostheses Are More Capable Than Ever

Today's Prostheses Are More Capable Than Ever

Newsy (Nov. 26, 2014) Advances in prosthetics are making replacement body parts stronger and more lifelike than they’ve ever been. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins