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:10/18/2014)... The “Human Insulin Market- by Product Type, [Human ... Insulin (Rapid Acting, Long Acting, Premixed)], by Brand ... Forecast to 2018” provides a detailed overview of ... trends, and strategies impacting the global human insulin ... the revenue and share analysis. , The global ...
(Date:10/18/2014)... 2014 The report "1,6-Hexanediol Market ... Forecasts to 2019", analyzes the global market on ... understand the industry details such as the key ... geographic regions. , Browse 81 Market Data Tables ... in-depth TOC on “1,6-Hexanediol Market by Application and ...
(Date:10/18/2014)... 18, 2014 The Asia-Pacific hardware encryption ... in Asia-Pacific with analysis and forecast of revenue. This ... expected to reach $51,362.6 million by 2018, at a ... through the TOC of the Asia-Pacific hardware encryption market ... provided. This also provides a glimpse of the segmentation ...
(Date:10/18/2014)... (PRWEB) October 18, 2014 The Asian Electronic ... market in Asian with analysis and forecast of revenue. The ... to grow to $2,328.0 million by 2018, at a CAGR ... TOC of the Asian Electronic Medical Record (EMR) market, to ... provides a glimpse of the segmentation of the market in ...
Breaking Biology Technology:Medical 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 51,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 21,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 31,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 41,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 5The Asia-Pacific hardware encryption display market is expected to reach $51,362.6 million by 2018 - New Report by MicroMarket Monitor 2The Asia-Pacific hardware encryption display market is expected to reach $51,362.6 million by 2018 - New Report by MicroMarket Monitor 3The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 2The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 3The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 4The Asian Electronic Medical Record (EMR) market is estimated to grow to $2,328.0 million by 2018 - New Report by MicroMarket Monitor 5
... Kathy Lu, associate professor of materials science and ... 2011 recipient of the Friedrich Wilhelm Bessel Research ... This award is for scholars, internationally renowned ... than 18 years ago and who are expected ...
... 2011 EIN News has been a world leader in ... monitoring network includes expanded coverage of science & ... that his company is continuing a 15-year expansion of its ... and other decision makers who need quick and comprehensive access ...
... June 1, 2011 Waters Corporation ... new Waters® ACQUITY UPLC® I-Class System, the highest ... separations technology to the next level.  For scientists ... UPLC I-Class features the lowest system dispersion and ...
Cached Biology Technology:Virginia Tech's Kathy Lu receives Humboldt Foundation research award 2Science & Technology News Service Expands Coverage 2Waters Introduces Highest Performing UPLC Ever Engineered - the New ACQUITY UPLC I-Class 2Waters Introduces Highest Performing UPLC Ever Engineered - the New ACQUITY UPLC I-Class 3Waters Introduces Highest Performing UPLC Ever Engineered - the New ACQUITY UPLC I-Class 4
(Date:10/15/2014)... Lithuania , Oct. 15, 2014   ... technologies, today announced the availability of the ... VeriLook Surveillance 3.0 provides real-time biometric face identification ... high-resolution digital surveillance cameras. The new version not ... and differentiates people from objects while they are ...
(Date:10/14/2014)... (Oct. 14, 2014)—It,s been millions of years since ... team led by Ohio University scientists is breathing life ... airflow through dinosaur snouts. The research has important implications ... breathe but to enhance the sense of smell and ... animals," said Ohio University doctoral student Jason Bourke, lead ...
(Date:10/14/2014)... Sinai-led research team has discovered a new kind of stem ... cell that lines liver blood vessels, according to a study ... The existence of such a cell type contradicts current theory ... and may hold clues to origins of, and future treatment ... a single cell into a complex being made up of ...
Breaking Biology News(10 mins):VeriLook Surveillance 3.0 SDK Identifies Faces and Moving Objects, Differentiates Pedestrians from Other Moving Objects in Video Surveillance Systems 2VeriLook Surveillance 3.0 SDK Identifies Faces and Moving Objects, Differentiates Pedestrians from Other Moving Objects in Video Surveillance Systems 3Dinosaur breathing study shows that noses enhanced smelling and cooled brain 2Dinosaur breathing study shows that noses enhanced smelling and cooled brain 3Stem cell discovery challenges dogma on how fetus develops; holds insights for liver cancer and reg 2Stem cell discovery challenges dogma on how fetus develops; holds insights for liver cancer and reg 3
... Indiana University scientists have solved a perplexing mystery ... in the process shedding light on a possible route ... teenagers. The disease occurs when a genetic mutation ... glycogen. Glycogen is a chain-like molecule the body uses ...
... a flying reptile that died 89 million years ago may ... creature known as Pteranodon . Previously, Pteranodon ... Wyoming in the Niobrara and Pierre geological formations. This likely ... found in Texas, according to paleontologist Timothy S. Myers at ...
... a new way to generate human motor nerve cells in a ... team from the Universities of Edinburgh, Cambridge and Cardiff has created ... from the brain and spine to other parts of the body ... is the first time that researchers have been able to generate ...
Cached Biology News:Discovery of source of glycogen 'manufacturing' errors sheds light on fatal disease 2Rare 89 million-year-old flying reptile fossil from Texas may be world's oldest Pteranodon 2Rare 89 million-year-old flying reptile fossil from Texas may be world's oldest Pteranodon 3Rare 89 million-year-old flying reptile fossil from Texas may be world's oldest Pteranodon 4Stem cell study could aid motor neurone disease research 2
... The CHEMICON MDR1 Shift Assay provides a ... that occur upon transport of MDR1 substrates. Thus, ... extent to which small molecules act as transport ... increased in the presence of MDR1 substrates, the ...
... is a simple high performance method for ... detergents without significant dilution of protein solution. ... the Detergent-OUT Spin column and collect detergent ... is suitable for removing detergents from a ...
... The wide and long ... of Polaroid gel documentation systems. ... holds the camera in place ... that allows photography on the ...
... are derived from Paraffin embedded tissue blocks, ... procedures to ensure the highest quality. Tissues ... one block, sectioned at a thickness of ... Sections are large (3-5 mm in diameter) ...
Biology Products: