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

ferrite films. (A thin layer of a different compound, strontium ruthenium oxide (SrRuO3), was first laid down between the substrate and the bismuth ferrite to serve as an electrode.)

Like many other multiferroic oxides, bismuth ferrite has the crystal structure of perovskite, in which planes of oxygen atoms and heavy atoms (like bismuth) alternate with planes of oxygen atoms and lighter atoms (like iron). An iron atom is at the center of the basic bismuth ferrite cubic cell, and its position whether slightly off center in one direction or another plus the positions of affected bismuth atoms, gives rise to local polarization.

The bismuth ferrite films contained ferroelectric domains between 5 and 10 micrometers (millionths of a meter) in dimension, and, says Seidel, "we can map and even change the domain structure by using different scanning-probe mechanisms."

Bismuth ferrite is an insulator, but each domain has a distinct polarization or orientation of charge, which Seidel mapped using a piezoresponse force microscope (PFM): as the PFM probe moves across a sample, an alternating electric field in the tip gives rise to a detectable mechanical response in the sample, according to its polarization. The same PFM setup can control the nature of the local polarization of the film by applying a large enough voltage to switch it.

To map out the topographic features of the film surface, the scanning probe was used in atomic force microscopy (AFM) mode. In AFM the probe effectively "feels" its way across the surface, like a stylus in a record player feeling the grooves in a record. Moreover, by setting a voltage that is too slight to affect the polarization of the domains, the researchers can probe the electronic properties of the films.

In this mode (conducting AFM), Seidel measured the local conductivity of the sample across the domains and across domain walls. The domains were indeed nonconducting since bismuth ferrite i
'/>"/>

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:8/28/2014)... Scientists, researchers, and technologists will converge ... Damage 2014 symposium. Marking its 46th year, the ... run 14-17 September. The event is sponsored by ... , The premier conference for basic and applied issues ... materials will engage researchers and engineers from numerous industries ...
(Date:8/28/2014)... August 28, 2014 Supplementing their ... a promotion for Eppendorf Safe Lock Centrifuge ... purchase the highest quality tubes at an affordable ... for customers doing chemical, medical, pharmaceutical, and life ... are not regularly able to afford Eppendorf products. ...
(Date:8/27/2014)... 27, 2014 Rhythm, a biopharmaceutical company developing ... that result in metabolic disorders, announced today that it ... the U.S. Securities and Exchange Commission (SEC) relating to ... common stock. The number of shares to be offered ... yet been determined. Citigroup and Cowen and ...
(Date:8/27/2014)... of nature,s mysteries is how plants survive impact ... the sun,s rays, while using this energy for ... in the plant,s blades quickly dissipate the energy ... quakes. Researchers at DTU Physics have now managed ... algae and bacteria contain light-absorbing proteins which play ...
Breaking Biology Technology:Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 2Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 3Eppendorf Safe Lock Centrifuge Tube Promotion Now Available at Major Pipette Distributor Pipette.com 2Eppendorf Safe Lock Centrifuge Tube Promotion Now Available at Major Pipette Distributor Pipette.com 3Rhythm Files Registration Statement for Proposed Initial Public Offering 2DTU researchers film protein quake for the first time 2
... Inc. (Nasdaq:,CEPH) announced today that the presentation slides that ... Conference are now available on the,"Investor Information" section of ... 8, 2008, Frank Baldino, Jr.,Ph.D., Chairman and CEO, will ... 2:00 p.m. Pacific Time (5 p.m. Eastern Time)., ...
... Record of Investment Success -, GAITHERSBURG, Md., ... unit of AstraZeneca plc (LSE: AZN.L, NYSE:,AZN), today ... Ventures, will broaden its focus to include areas ... therapeutic areas of,cardiovascular and metabolic disease, pain and ...
... SEC Shares Expected to be Approved ... Germany and OXFORD, England, January 7 /PRNewswire-FirstCall/,--, - ... Consolidated Financial Statements With a Positive Net Effect on,the ... 2007, Evotec AG (Frankfurt Stock Exchange: EVT) today ...
Cached Biology Technology:Cephalon Presentation Slides for the 26th Annual JPMorgan Healthcare Conference Now Available 2MedImmune Broadens Focus of Venture Capital Fund to Include New Therapeutic Areas 2MedImmune Broadens Focus of Venture Capital Fund to Include New Therapeutic Areas 3Evotec Provides Update on Planned NASDAQ Listing in the Context of its Announced Acquisition of Renovis 2Evotec Provides Update on Planned NASDAQ Listing in the Context of its Announced Acquisition of Renovis 3Evotec Provides Update on Planned NASDAQ Listing in the Context of its Announced Acquisition of Renovis 4Evotec Provides Update on Planned NASDAQ Listing in the Context of its Announced Acquisition of Renovis 5
(Date:8/28/2014)... roads will be built worldwide by 2050. Many of ... they bring an influx of destructive loggers, hunters and ... created a ,global roadmap, for prioritising road building across ... of development and environmental protection. , The map has ... importance of ecosystems and a ,road-benefits, layer that estimates ...
(Date:8/28/2014)... homes could pose a significant health risk to people with ... Journal of Allergy and Clinical Immunology . , By critically ... the research has found that the presence of several types ... as well as increasing the likelihood of developing the condition. ... the University of Exeter Medical School and is the first ...
(Date:8/28/2014)... exports from Washington, Oregon, northern California, and Alaska totaled ... quarter of 2014, an increase of more than 10 ... U.S. Forest Service,s Pacific Northwest Research Station reported today. ... by 4 percent to 247 million board feet. , ... more than 5 percent to $390 million in the ...
Breaking Biology News(10 mins):Study shows where on the planet new roads should and should not go 2Study shows where on the planet new roads should and should not go 3Indoor mold poses health risk to asthma sufferers 2West coast log exports up, lumber exports down in second quarter of 2014 2
... the Science of Food and Agriculture shows that konjac ... strains of E. coli and Salmonella bacteria. The study ... Research Centre, the Netherlands, shows that these foodstuffs act as ... themselves to the fibrous foods instead of the gut cells ...
... an ice-free region of Antarctica have discovered the last ... insects--on the interior of the southernmost continent before temperatures ... An abrupt and dramatic climate cooling of 8 degrees ... roughly 14 million years ago, forced the extinction of ...
... (August 5, 2008) A study published online today in ... two eggs for breakfast, as part of a reduced-calorie diet, ... than those who eat a bagel breakfast of equal calories. ... Journal of the American College of Nutrition , which ...
Cached Biology News:Antarctic fossils paint a picture of a much warmer continent 2Antarctic fossils paint a picture of a much warmer continent 3Antarctic fossils paint a picture of a much warmer continent 4Antarctic fossils paint a picture of a much warmer continent 5Adults who eat eggs for breakfast lose 65 percent more weight 2Adults who eat eggs for breakfast lose 65 percent more weight 3
A431 cells Source: Cell Lysate Form: Ready to Use Application: Western Blotting Control...
Madin-Darby bovine kidney (MDBK) cells Source: Cell Lysate Form: Ready to Use Application: Western Blotting Control...
... 48 lanes, 24 bi-directional, of patient DNA ... either slab gel or capillary sequencers, using ... parameters in Explorer have been sealed to ... have built Explorer for ease of use, ...
Molecular Biological Resources offers bulk quantities of existing protein products. Please see the Chimerx divisions website for existing products and contact lloconne@molbiores.com for pricing....
Biology Products: