Featured Research

from universities, journals, and other organizations

Discovery Of Current Spike Phenomenon In Semiconductor Materials Leads To New Understanding Of Nanoscale Plasticity

Date:
April 8, 2009
Source:
Suomen Akatemia (Academy of Finland)
Summary:
Plasticity in certain semiconductor materials at the nanoscale is actually linked to phase transformation rather than dislocation nucleation, as previously thought.

Plasticity in certain semiconductor materials at the nanoscale is actually linked to phase transformation rather than dislocation nucleation, as previously thought.

Related Articles


This is shown by the results of an international research team led by Professor Roman Nowak of the Nordic Hysitron Laboratory (NHL) at Helsinki University of Technology, just published in Nature Nanotechnology.

Plasticity has always been associated with defect movement or initiation, but Nowak’s team has proved that plasticity can indeed start from non-dislocation processes, and that this phase transformation occurs in a stressed nano-volume, changing from one crystalline structure to another without affecting defect activity. The phenomenon, named the “Current Spike”, is clearly visible, and its explanation relies heavily on advanced physics.

“The implications of these findings are such that our understanding of material behavior in the nano-regime may just need to be revised once again. If this approach is further developed to encompass other sets of materials than the ones studied here, this new evidence will certainly lead to many advances in pressure-sensing and pressure-switching applications, just to name one of many potential benefactors of these newly-revealed discoveries,” Nowak says.

While certainly enlightening on their own, the NHL’s recently-published findings represent the first critical steps towards addressing an intriguing larger issue: Under which conditions and at which length scales does combined mechanical-electrical coupling lead to similar effects? NHL will be leading the way and acting as a source of inspiration in this quest for understanding of the deformation of materials at nanoscale.

The main target of NHL is the mechanical characterization of advanced materials and nanostructures using the nanoindentation testing technique. An instrument developed by Hysitron, Inc. of Minneapolis, USA allows for a quantitative and concurrent measurement of the mechanical and electrical properties. These experiments are complemented by computational methods, with the aim of exploring nanometer-size contacts in the material and arrive at the final unique clarification.

The research is part of the Academy of Finland’s FinNano research programme.


Story Source:

The above story is based on materials provided by Suomen Akatemia (Academy of Finland). Note: Materials may be edited for content and length.


Journal Reference:

  1. Nowak et al. An electric current spike linked to nanoscale plasticity. Nature Nanotechnology, 2009; DOI: 10.1038/nnano.2009.49

Cite This Page:

Suomen Akatemia (Academy of Finland). "Discovery Of Current Spike Phenomenon In Semiconductor Materials Leads To New Understanding Of Nanoscale Plasticity." ScienceDaily. ScienceDaily, 8 April 2009. <www.sciencedaily.com/releases/2009/03/090331091604.htm>.
Suomen Akatemia (Academy of Finland). (2009, April 8). Discovery Of Current Spike Phenomenon In Semiconductor Materials Leads To New Understanding Of Nanoscale Plasticity. ScienceDaily. Retrieved January 27, 2015 from www.sciencedaily.com/releases/2009/03/090331091604.htm
Suomen Akatemia (Academy of Finland). "Discovery Of Current Spike Phenomenon In Semiconductor Materials Leads To New Understanding Of Nanoscale Plasticity." ScienceDaily. www.sciencedaily.com/releases/2009/03/090331091604.htm (accessed January 27, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Tuesday, January 27, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Cablevision Enters Wi-Fi Phone Fray

Cablevision Enters Wi-Fi Phone Fray

Reuters - Business Video Online (Jan. 26, 2015) The entry by Cablevision and Google could intensify the already heated price wars for mobile phone service. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Hector the Robot Mimics a Giant Stick Insect

Hector the Robot Mimics a Giant Stick Insect

Reuters - Innovations Video Online (Jan. 26, 2015) A robot based on a stick insect can navigate difficult terrain autonomously and adapt to its surroundings. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Raw: Pilot Uses Full-Plane Parachute in Crash

Raw: Pilot Uses Full-Plane Parachute in Crash

AP (Jan. 26, 2015) A pilot en route to Hawaii crashed his single-engine plane into the Pacific Ocean Monday and escaped safely thanks to the use of a full-plane parachute. US Coast Guard video captures the dramatic landing. (Jan. 26) Video provided by AP
Powered by NewsLook.com
Scientists Model Flying, Walking Drone After Vampire Bats

Scientists Model Flying, Walking Drone After Vampire Bats

Buzz60 (Jan. 26, 2015) Swiss scientists build a new drone that can both fly and walk, modeling it after the movements of common vampire bats. Jen Markham (@jenmarkham) has the story. Video provided by Buzz60
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