Nav: Home

Controllable functional ferroelectric domain walls under piezoresponse microscope

February 06, 2020

Ferroelectric materials possessing high photoelectric, piezoelectric and dielectric response are widely applied in industrial products, such as transducers, capacitors and memory devices. However, as the development of technology, miniaturization, integration and flexibility are of great importance, which could hardly be fulfilled by traditional bulk ferroelectric materials. Hence, nanoscale ferroelectric domain walls (DWs), with recently found dramatic mechanical, electrical, optical and magnetic properties aside from ferroelectric domains, have become a hotspot.

Despite intriguing properties ferroelectric domain walls have, to put them into use, understanding DW dynamics and developing DW manipulation approaches are urgently needed. It is known that external stimuli, such as electric field, mechanical strain and temperatures, could manipulate DW morphology and stability. Besides, the DW movement could also be affected by inertial properties of the sample as well as intrinsic characteristics of DWs. However, the impact of bound charges, which is one of the foremost characteristics of DWs, is mostly studied theoretically.

In a new research article published in the Beijing-based National Science Review, scientists at the Nanjing University in Nanjing, China, Rutgers University in New Jersy, USA and at Chinese Academy of Sciences in Shenzhen, China provide direct experimental insight into DW dynamics of differently charged DWs under electric field. It is found via atomic force microscopy that the mobility of differently charged DWs in bismuth ferrite films varies with the electric field.

Under lower voltages, head-to-tail DWs are more mobile than other DWs, while under higher voltages, tail-to-tail DWs become rather active and possess relatively long average length. This is attributed to the high nucleation energy and relative low growth energy for charged DWs. Based on these results, researchers designed a two-step poling approach. They polarize ferroelectric thin films with lower and higher electric field by scanning the surface of the sample with the atomic force microscopy tip. Arrays of well-aligned stripe tail-to-tail DWs are successfully produced as conductive paths, while the orientation of DWs could be changed by varying the scanning direction of the tip. In this way, they achieved the oriented growth and configuration control of ferroelectric DWs.

"Our work unveils the remarkable impact of charge accumulation around DWs on DW mobility, providing a generalizable approach for DW dynamic studies in ferroic materials. The methodology proposed here for the advanced tunability of conductive DWs makes significant progress towards their applications in functional nano-devices", they claim.
-end-
This research received funding from the National Key Research Program of China, the State Key Program for Basic Research of China, the National Natural Science Foundation of China, and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

See the article:

Shuyu Xiao, Yaming Jin, Xiaomei Lu, S W Cheong, Jiangyu Li, Yang Li, Fengzhen Huang, and Jinsong Zhu
Dynamics and manipulation of ferroelectric domain walls in bismuth ferrite thin films
Natl Sci Rev; doi: 10.1093/nsr/nwz176
https://doi.org/10.1093/nsr/nwz176

The National Science Review is the first comprehensive scholarly journal released in English in China that is aimed at linking the country's rapidly advancing community of scientists with the global frontiers of science and technology. The journal also aims to shine a worldwide spotlight on scientific research advances across China.

Science China Press

Related Electric Field Articles:

How dangerous are burning electric cars?
What happens if an electric car burns in a road tunnel or an underground car park?
One more hit from rare Earth: Efficient coherent spin manipulation by the electric field
Researchers used rare earth ions to efficiently couple the electric and magnetic behaviors of material.
Battery breakthrough gives boost to electric flight and long-range electric cars
Researchers at the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab), in collaboration with Carnegie Mellon University, have developed a new battery material that could enable long-range electric vehicles that can drive for hundreds of miles on a single charge, and electric planes called eVTOLs for fast, environmentally friendly commutes.
Deterministic reversal of single magnetic vortex circulation by an electric field
Chinese researchers discover a deterministic reversal of magnetic vortex circulation in a Ni79Fe21 (NiFe) island on top of a layered-perovskite Bi2WO6 (BWO) thin film using an electric field.
4D electric circuit network with topology
Researchers from China and Germany have proposed a design scheme to implement a four-dimensional topological insulating state in circuit network, which provides a convenient physical platform for studying high-dimensional states.
How we might recharge an electric car as it drives
Stanford engineers demonstrate a technology that could one day be scaled up to power a car moving down the road.
Electric cars better for climate in 95% of the world
Fears that electric cars could actually increase carbon emissions are unfounded in almost all parts of the world, news research shows.
O-FIB: Far-field-induced near-field breakdown for direct nanowriting in an atmospheric environment
Nanoscale texturing, drilling, cutting and spatial sculpturing require not only high accuracy, but also the capability of manufacturing in the atmospheric environment.
What to expect when you're expecting electric transportation
While electric vehicles alone may not reduce carbon emissions, a new study reveals that when electric vehicles are powered with renewable energy and coupled with carbon policy strategies, they can help combat climate change without sacrificing economic growth.
Electric solid propellant -- can it take the heat?
Electric solid propellants are being explored as a safer option for pyrotechnics, mining, and in-space propulsion because they only ignite with an electric current.
More Electric Field News and Electric Field Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Debbie Millman: Designing Our Lives
From prehistoric cave art to today's social media feeds, to design is to be human. This hour, designer Debbie Millman guides us through a world made and remade–and helps us design our own paths.
Now Playing: Science for the People

#574 State of the Heart
This week we focus on heart disease, heart failure, what blood pressure is and why it's bad when it's high. Host Rachelle Saunders talks with physician, clinical researcher, and writer Haider Warraich about his book "State of the Heart: Exploring the History, Science, and Future of Cardiac Disease" and the ails of our hearts.
Now Playing: Radiolab

Insomnia Line
Coronasomnia is a not-so-surprising side-effect of the global pandemic. More and more of us are having trouble falling asleep. We wanted to find a way to get inside that nighttime world, to see why people are awake and what they are thinking about. So what'd Radiolab decide to do?  Open up the phone lines and talk to you. We created an insomnia hotline and on this week's experimental episode, we stayed up all night, taking hundreds of calls, spilling secrets, and at long last, watching the sunrise peek through.   This episode was produced by Lulu Miller with Rachael Cusick, Tracie Hunte, Tobin Low, Sarah Qari, Molly Webster, Pat Walters, Shima Oliaee, and Jonny Moens. Want more Radiolab in your life? Sign up for our newsletter! We share our latest favorites: articles, tv shows, funny Youtube videos, chocolate chip cookie recipes, and more. Support Radiolab by becoming a member today at Radiolab.org/donate.