Featured Research

from universities, journals, and other organizations

Magnetization can surf on the top of a laser-induced sound wave

Date:
April 10, 2014
Source:
Radboud University Nijmegen
Summary:
An effective coupling between magnetism and light can be mediated by sound. This newly discovered phenomenon could be important for recording data on a magnetic device with the help of light.

Artistic representation of sound waves triggered in a medium with the help of a femtosecond laser pulse. The sound wave at the frequency f causes a very anharmonic response of the magnetization that oscillates at the frequencies f, 2f and 3f (developed by D. Afanasiev).
Credit: Image courtesy of Radboud University Nijmegen

An effective coupling between magnetism and light can be mediated by sound. This newly discovered phenomenon could be important for recording data on a magnetic device with the help of light.

Physical Review Letters publishes the finding of a team from Radboud University (Netherlands) and Taurida National University (Crimea) in their issue of April 11.

Controlling the magnetic state of media with the help of light may be the best way to develop a new generation of magnetic data storing devices. The problem, however, is to find an effective mechanism for optically controlling magnetism. Indeed, according to quantum mechanics the strongest effect in light-matter interaction is the effect of the electric field of light on the electrons, suggesting that some net magnetization must be conserved.

Light explosion

An international team of scientists from Nijmegen (the Netherlands) and Simferopol (Crimea) has discovered a very effective method of optically controlling magnetism: an intense and ultrashort (shorter than 100 femtoseconds) laser pulse excites electrons in a medium to such an extent, that the excited electron-clouds push the atoms off, thereby bringing them in motion and launching a sound wave.

Anharmonic

The fact that the sound wave can effectively couple to the magnetization is well known. Unexpectedly, the scientists found that the optically launched sound at the frequency f is accompanied by a response of the magnetization at the frequencies f, 2f and 3f. Such a phenomenon is called anharmonicity. Any pendulum becomes anharmonic if the deviations from the equilibrium become large.

Very effective

"The fact that the laser-induced oscillations of the magnetization are anharmonic is very intriguing. It means that the coupling of light with the magnetism is very effective and we are getting close to our dream -- to record magnetic information with the help of light" says Alexey Kimel, Associate Professor and research group leader at Radboud University, the Netherlands.

It is remarkable that the scientists observed this effect in iron borate. This material is very similar to hematite -- one of the cheapest magnets and widely spread minerals. "For optical experiments green iron borate is much more convenient than black hematite, while the magnetic phenomena in those crystals are very similar."


Story Source:

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


Journal Reference:

  1. D. Afanasiev, I. Razdolski, K. M. Skibinsky, D. Bolotin, S. V. Yagupov, M. B. Strugatsky, A. Kirilyuk, Th. Rasing, A. V. Kimel. Laser Excitation of Lattice-Driven Anharmonic Magnetization Dynamics in Dielectric FeBO3. Physical Review Letters, 2014; 112 (14) DOI: 10.1103/PhysRevLett.112.147403

Cite This Page:

Radboud University Nijmegen. "Magnetization can surf on the top of a laser-induced sound wave." ScienceDaily. ScienceDaily, 10 April 2014. <www.sciencedaily.com/releases/2014/04/140410083410.htm>.
Radboud University Nijmegen. (2014, April 10). Magnetization can surf on the top of a laser-induced sound wave. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2014/04/140410083410.htm
Radboud University Nijmegen. "Magnetization can surf on the top of a laser-induced sound wave." ScienceDaily. www.sciencedaily.com/releases/2014/04/140410083410.htm (accessed July 29, 2014).

Share This




More Matter & Energy News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Newsy (July 28, 2014) Stanford University published its findings for a "pure" lithium ion battery that could have our everyday devices and electric cars running longer. Video provided by Newsy
Powered by NewsLook.com
The Carbon Trap: US Exports Global Warming

The Carbon Trap: US Exports Global Warming

AP (July 28, 2014) AP Investigation: As the Obama administration weans the country off dirty fuels, energy companies are ramping-up overseas coal exports at a heavy price. (July 28) Video provided by AP
Powered by NewsLook.com
Shipping Crates Get New 'lease' On Life

Shipping Crates Get New 'lease' On Life

Reuters - Business Video Online (July 25, 2014) Shipping containers have been piling up as America imports more than it exports. Some university students in Washington D.C. are set to get a first-hand lesson in recycling. Their housing is being built using refashioned shipping containers. Lily Jamali reports. Video provided by Reuters
Powered by NewsLook.com
Europe's Highest Train Turns 80 in French Pyrenees

Europe's Highest Train Turns 80 in French Pyrenees

AFP (July 25, 2014) Europe's highest train, the little train of Artouste in the French Pyrenees, celebrates its 80th birthday. Duration: 01:05 Video provided by AFP
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:
from the past week

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