Navigation Links
Domain walls that conduct electricity
Date:1/29/2009

s an insulator but surprisingly, certain domain walls exhibited electrical conductivity. Their conductivity depended on the angular difference in the direction of the polarization on either side of the domain wall.

To understand this unexpected conductivity, the researchers used transmission electron microscopy (TEM) at Berkeley Lab's National Center for Electron Microscopy, a national user facility supported by BES, to inspect how the atoms were differently arranged, in the domains and near the domain walls. Bismuth ferrite's domain walls are oriented along two distinct crystallographic planes; they can separate domains with either 109-degree, 71-degree, or 180-degree differences in the direction of polarization. By comparing the atomic structure of a nonconducting 71-degree domain wall to the atomic structure of a conducting 109-degree domain wall, the researchers found a clear difference in local structure: it promised to hold the key to understanding the origin of the effect.

How an insulating material's domain walls can conduct electricity

"We worked with theorists to help us model the behavior we had observed and to understand the mechanism of the conduction," says Ramesh. "What emerged was a clear picture of the changes in the structure of the unit cells of the bismuth ferrite near the domain walls." These structural changes are directly connected to a local change in the electronic properties of the material at the center of the domain wall.

"What happens is that as the positions of the central iron atoms change crossing the domain wall, the polarization increases perpendicular to the domain wall but at the same time goes to zero parallel to the wall, before increasing again," says Martin. "This causes any free electrons in the vicinity to accumulate at the wall, where they can move along the wall itself."

The researchers' calculations also showed that the band gap of bismuth ferrite a critical proper
'/>"/>

Contact: Paul Preuss
paul_preuss@lbl.gov
510-486-6249
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3 4 5

Related biology technology :

1. Time Domain Showcases Precision Location Capability of Ultra Wideband PLUS Product Line at HIMSS 2008
2. NorthPoint Domain and NYU Vascular Associates Partner to Develop New Generation of Care Delivery Informatics Instruments
3. NorthPoint Domain and Boston Medical Center Partner to Apply Advanced Patient Engagement Instruments to Pioneering Cardiac Robotic Surgery Program
4. WallSt.net (www.wallst.net) Announces Upcoming Interview With CEO of Osteologix
5. WallSt.net (www.wallst.net) Announces Upcoming Interview With CEO of DNAPrint Genomics
6. WallSt.net Announces Upcoming Interview with CEO of BioSante Pharmaceuticals
7. WallSt.net Announces Upcoming Interview With CEO of Biomoda
8. Synvista Therapeutics to be Featured on Wallst.net
9. WallSt.net Announces Upcoming Interview With CEO Of Immunosyn Corporation
10. AMDL Presentation of China Success Story from Rodman & Renshaw Annual Healthcare Conference Available at WallStreetReporter.com
11. WallSt.net Announces Upcoming Interview With CEO of ReBuilder Medical Technologies
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Domain walls that conduct electricity
(Date:10/20/2014)... , Oct. 20, 2014  GenVec, Inc. (NASDAQ: ... Horovitz , Ph.D., from its board of directors effective on ... August 2003, and served as its chairman from June 2006 ... the Nominating and Corporate Governance and Audit Committees of the ... than a decade of dedicated service to GenVec, and its ...
(Date:10/19/2014)... The Latin American hardware encryption display market ... with analysis and forecast of revenue. This market was ... to reach $2,366.8 million by 2018, at a CAGR ... the TOC of the Latin American hardware encryption market ... provided. It also provides a glimpse of the segmentation ...
(Date:10/19/2014)... The Asia-Pacific Speech Analytics market report defines and ... and forecast of revenue. This market is estimated to ... by 2019, at a Compound Annual Growth Rate (CAGR) ... the TOC of the Asia-Pacific Speech Analytics market report ... It also provides a glimpse of the segmentation in ...
(Date:10/18/2014)... The “Human Insulin Market- by Product Type, ... Human Insulin (Rapid Acting, Long Acting, Premixed)], by ... - Forecast to 2018” provides a detailed overview ... market trends, and strategies impacting the global human ... of the revenue and share analysis. , The ...
Breaking Biology Technology:Zola P. Horovitz To Retire From GenVec Board 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 3The Asia-Pacific Speech Analytics market is estimated to reach $208 million by 2019 - New Report by MicroMarket Monitor 2The Asia-Pacific Speech Analytics market is estimated to reach $208 million by 2019 - New Report by MicroMarket Monitor 3The Asia-Pacific Speech Analytics market is estimated to reach $208 million by 2019 - New Report by MicroMarket Monitor 4Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 2Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 3Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 4Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 5
... Informex , the leading meeting place for buyers ... the Global Pharma Sourcing Conference to be held December ... Philadelphia, Pennsylvania. The two day program will be jointly ... address key issues that global chemical and pharmaceutical industry ...
... Corp. (IDC), a privately held biotechnology company developing ... and allergy, announced today that it has entered ... investigate the use of IDC,s Glucopyranosyl Lipid Adjuvant ... in the field of allergy. (Logo: ...
... Inc. (Nasdaq: SGMO ) today reported third quarter ... third quarter ended September 30, 2011, Sangamo reported a consolidated ... to a net loss of $8.7 million, or $0.19 per ... 30, 2011, the Company had cash, cash equivalents and marketable ...
Cached Biology Technology:Informex Introduces a Thorough Global Pharma Perspectives Conference 2Sangamo BioSciences Reports Third Quarter 2011 Financial Results 2Sangamo BioSciences Reports Third Quarter 2011 Financial Results 3Sangamo BioSciences Reports Third Quarter 2011 Financial Results 4Sangamo BioSciences Reports Third Quarter 2011 Financial Results 5Sangamo BioSciences Reports Third Quarter 2011 Financial Results 6
(Date:10/18/2014)... patients referred for evaluation of suspected genetic conditions, ... 25 percent, including detection of a number of ... disease, according to a study appearing in ... coincide with the American Society of Human Genetics ... or coding regions of thousands of genes simultaneously ...
(Date:10/17/2014)... Researchers from the University of Copenhagen have shown for ... the lungs of Cystic fibrosis patients, giving them the ... growth in chronic infections. , The study also discovered ... fibrosis (CF) patients was halted or slowed down by ... consumed all the oxygen and helped "suffocate" the bacteria, ...
(Date:10/16/2014)... Oregon and Washington land managers have a new synthesis ... eastside moist mixed-conifer (MMC) forests in the two states. ... Forests in Eastern Oregon and Washington: A Synthesis of ... Management, a general technical report published by the U.S. ... response to a request from managers for a synthesis ...
Breaking Biology News(10 mins):Whole-exome sequencing shows potential as diagnostic tool 2Scientists opens black box on bacterial growth in cystic fibrosis lung infection 2New report synthesizes best available science on management of moist mixed-conifer forests 2
... at the Smithsonian and partnering organizations have discovered a remarkably ... the Republic of Palau. This fish exhibits many primitive anatomical ... 800 species of living eels, resulting in its classification as ... The team,s research is published online in the Proceedings ...
... Sons of male mice exposed to prenatal stress are ... in the August 17 issue of The Journal of ... lead to individual differences in stress response that may be ... of Pennsylvania, and colleagues previously found that male mice were ...
... and Switzerland have investigated the remarkable distance that microorganisms ... about their potential to colonise new lands and also ... John Moores University (LJMU), Swiss Federal Institute for Forest, ... Fdrale de Lausanne (EPFL) the University of Neuchtel published ...
Cached Biology News:Scientists discover the most primitive living eel 2Effects of prenatal stress passed across generations in mice 2Life on the wind: Study reveals how microbes travel the Earth 2
Although each Beacon 2000 System includes one preinstalled sample chamber (size specified at time of order), optional chambers are available and easily retrofit by the user....
Whole blood is collected from healthy guinea pigs of either sex from US source which are free of visible diseases at time of blood collection. Hemolytic titer: CH50 = 435 units...
...
... serial preparation of four ... cytosol/particulate/cytoskeleton/nuclear fractions from one ... can directly be used ... as 2-D gel/Western blot/gel-shift/translocation/enzyme ...
Biology Products: