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:10/22/2014)... Involution Studios , a healthcare ... new infographic, Understanding Ebola . The goal ... easy to follow informative tool for anyone wanting to ... and prevention. , "As the news has spread in ... outbreak represents not only a healthcare crisis with global ...
(Date:10/22/2014)... 22, 2014 Currently offering a ... & D Weighing, Rice Lake, and Ohaus, Pipette.com ... . The Sartorius CPA Semi-Micro Balance is ideal ... precise, and user-friendly laboratory balance. , Sartorius is ... their laboratory balances are well known for their ...
(Date:10/22/2014)... 22, 2014 Physicians Choice Laboratory ... pharmacogenetics menu, which enables healthcare providers to individualize ... PCLS’s evidence-based results, healthcare providers are better able ... therapy, while minimizing risks for adverse drug reactions ... to the FDA [1] more than 2.2 million ...
(Date:10/22/2014)...   Synthetic Biologics, Inc. (NYSE MKT: SYN), ... infections and diseases, announced today that the U.S. Patent ... for a composition of matter patent application that covers ... SYN-004. This is Synthetic Biologics, first allowed patent application ... to the Company,s extensive C. difficile patent ...
Breaking Biology Technology:Involution Studios' Ebola Infographic Provides Key Disease Information and Statistics at a Glance 2Pipette.com Launches the Addition of Sartorius CPA Semi-Micro Balance to Their Product Portfolio with Special Promotional Pricing 2Pipette.com Launches the Addition of Sartorius CPA Semi-Micro Balance to Their Product Portfolio with Special Promotional Pricing 3PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 2PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 3Synthetic Biologics Announces Allowance of Key U.S. Composition of Matter Patent for C. difficile Program 2Synthetic Biologics Announces Allowance of Key U.S. Composition of Matter Patent for C. difficile Program 3Synthetic Biologics Announces Allowance of Key U.S. Composition of Matter Patent for C. difficile Program 4
... Wis . - Nearly half of the nation's top 25 ... Endpoint Exchange, LLC , a business unit of ... Ilsley Corp. , ,Twelve of the nation's largest banks ... instead of having to physically convey them, a capability that ...
... money from the Minority Business Development Fund , the ... minority-owned technology businesses in Madison. , , Gov. Jim Doyle ... will receive loans to help them expand and create jobs. ... capital to develop and market a private, anonymous software transaction ...
... Wis. - Following a devastating legal rebuke, the ... the company he founded to pursue other business interests. ... the Verona-based provider of uninterruptible power supply services, resigned ... president Charley Eaton was appointed president of JT Packard. ...
Cached Biology Technology:
(Date:10/18/2014)... 2,000 patients referred for evaluation of suspected genetic ... for 25 percent, including detection of a number ... to disease, according to a study appearing in ... to coincide with the American Society of Human ... exons or coding regions of thousands of genes ...
(Date:10/17/2014)... German . Why ... order to reproduce? And why are there two sexes anyway? ... issue of the research journal Molecular Human Reproduction ... from Bielefeld University Bielefeld has compiled this special issue on ... female to copulate with several males in quick succession – ...
(Date:10/16/2014)... constantly wages war on the human body. Battles ... stalemate. In pancreatic cancer, this stalemate—known as tumor ... aggressively malignant, a phenomena that is poorly understood. ... the laboratory of Salvatore Torquato, a Professor of ... conditions surrounding tumor dormancy and the switch to ...
Breaking Biology News(10 mins):Whole-exome sequencing shows potential as diagnostic tool 2Sperm wars 2Modeling tumor dormancy 2
... was launched today by the Chinese National Space Administration ... Centre, Sichuan, atop a Long March 3A rocket. ... to land robotic explorers on the Moon before 2020. ... first is to make three-dimensional images of many lunar ...
... and Ludwigshafen, Germany-October 24, 2007-Harvard University,s Office of ... agreement to jointly establish the BASF Advanced Research ... of Engineering and Applied Sciences (SEAS) the initiative ... and schools throughout the University. Set up ...
... Researchers at the University of Minnesotas Stem Cell Institute ... used to study how human embryonic stem cells differentiate. ... Experimental Biology and Medicine. Researchers know very little ... fully understand these cells self renewal capacity and pluripotency, ...
Cached Biology News:Chang'e-1 -- new mission to Moon lifts off 2BASF and Harvard University announce extensive research collaboration 2