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:10/1/2014)... Slone Partners , a national ... and Laboratory Testing industries, reported a 120% increase in ... level and above from July 2013 to July 2014. ... of rapid breakthroughs in diagnostics, reimbursement has failed to ... been forced to fold, consolidate, or carry on without ...
(Date:10/1/2014)... Industry leaders from retail ... around the theme, ,Commercial Opportunities in the Era of ... Elsevier , a world-leading provider of scientific, ... a gathering of some of the industry,s most prominent ... today and in the future. The Elsevier ...
(Date:9/30/2014)... Using a bio-mimicking analog of one of nature,s ... international research team led by Alejandro Briseno of ... major step in developing long-sought polymer architecture to ... use in electronic devices. , Briseno, with ... others at Stanford University and Dresden University of ...
(Date:9/30/2014)... , Sept. 30, 2014 Nematicide ... kill nematodes. Nematodes are microscopic parasitic roundworms, found ... and inside other plants and animals. Nematicides have ... or other properties promoting migration through the soil. ... than 1,000 plant-parasitic nematodes. With more than 10,000 ...
Breaking Biology Technology:Slone Partners Meets Growing Demand as Industry Focuses on Reimbursement & Regulation 2Elsevier Healthcare and Pharmaceutical Economics Conference 2014 To Convene Industry Leaders to Discuss Top Healthcare Business Issues 2Elsevier Healthcare and Pharmaceutical Economics Conference 2014 To Convene Industry Leaders to Discuss Top Healthcare Business Issues 3Blades of grass inspire advance in organic solar cells 2Blades of grass inspire advance in organic solar cells 3Nematicides Market by Types (Fumigants, Organophosphates, Carbamate and Bio-Nematicides), Applications (Agrochemicals, Industrial, and Others), and Geography (North America, Europe, Asia-Pacific & ROW) - Global Trends & Forecasts to 2019 2
... Tetrahedral dice, which have four triangular sides, pack ... to research performed by a collaboration of New York ... result of a series of experiments that involved pouring ... dice until the containers were completely filled. After adding ...
... 3 /PRNewswire-FirstCall/ - Angiotech Pharmaceuticals, Inc. ( ANPI, TSX: ANP), a specialty ... exclusive distribution agreement with B. Braun for its proprietary Quill(TM) SRS product line ... The term of the distribution agreement will be for five years. , ... According to The Royal College of Surgeons ...
... , LAWRENCEVILLE, N.J. , May 3 ... (n = 520) multi-center patient registry study of its Lacrisert® ... index (OSDI) in patients with moderate-to-severe dry eye after one ... poster this week during the 2010 Annual Meeting of the ...
Cached Biology Technology:Densest dice packing and computing with molecules 2Angiotech announces exclusive distribution agreement with B. Braun for Angiotech's proprietary Quill(TM) SRS product line 2Angiotech announces exclusive distribution agreement with B. Braun for Angiotech's proprietary Quill(TM) SRS product line 3Angiotech announces exclusive distribution agreement with B. Braun for Angiotech's proprietary Quill(TM) SRS product line 4Angiotech announces exclusive distribution agreement with B. Braun for Angiotech's proprietary Quill(TM) SRS product line 5Study of Lacrisert(R) Dry Eye Insert 2Study of Lacrisert(R) Dry Eye Insert 3Study of Lacrisert(R) Dry Eye Insert 4Study of Lacrisert(R) Dry Eye Insert 5
(Date:9/30/2014)... 2014  Spectra Automation, a trusted supplier ... and power generation industries, announced today the ... an easy-to-use and cost-effective data collection, analysis ... laboratories. Most upstream process ... systems. Accessing and consolidating data from these ...
(Date:9/29/2014)... Clostridium ramosum , coupled with a high-fat diet, may ... week in mBio , the online open-access journal of ... from the German Institute of Human Nutrition Potsdam-Rehbruecke in Nuthetal ... ramosum gained weight when fed a high-fat diet. Mice ... obese even when consuming a high-fat diet, and mice that ...
(Date:9/29/2014)... "human activities in this area of the world have contributed ... grown for use as a cooking oil and biofuel, while ... the most widely produced edible oil in the world, and ... soybean oil. , The environmental effects of such growth have ... crop, and the preferred method is fire. The clearing often ...
Breaking Biology News(10 mins):Spectra Automation Introduces RECONN Bioprocess Manager 2Gut bacteria promote obesity in mice 2
... food meal is never good for you, but washing that ... a new University of Guelph study. Researcher Marie-Soleil Beaudoin ... levels spike after eating a high-fat meal, but that the ... coffee jumping to levels similar to those of people ...
... leaves influence the sunlight reaching inner canopy leaves by changing ... physiology of leaves within the tree canopy is not constant, ... crown. This phenomenon is expected to have important consequences for ... A new study describes how the leaves in the outer ...
... ARBOR, Mich.Getting older doesn,t mean giving up muscle strength. ... loss that comes with age, but the Golden Years can be ... Michigan Health System. "Resistance exercise is a great ... people can function more readily in daily life," says Mark Peterson, ...
Cached Biology News:Got a craving for fast food? Skip the coffee, study says 2Older and stronger: Progressive resistance training can build muscle, increase strength as we age 2Older and stronger: Progressive resistance training can build muscle, increase strength as we age 3Older and stronger: Progressive resistance training can build muscle, increase strength as we age 4
... thermocycler provides maximum performance on minimum space. ... elements, high heating and cooling rates have ... times. With a maximum capacity of 48 ... the capacity of much more expensive 96 ...
Sf21 Insect Cells (Live) in Max-XP Medium...
Dual-bay Dyad thermal cycler chassis, does not include the Alpha units (requires 2)...
EZ-DeWax is a one-step solution that simultanously removes paraffin from and rehydrates formalin-fixed, paraffin embedded tissue...
Biology Products: