Scientists know the correct answer is that interplay between theory and experiments result in new advances. At times, experiment and technological development pave the way for theory. At other times, successful theory can contribute substantially to interpretation and analysis of the experimental data.
But even more important is when theory can predict new effects and lead to new experiments and developments. This is evident in the new work at the University of Nebraska-Lincoln Materials Research Science and Engineering Center published in the scientific journal Nano Letters.
Three years ago, theoretical work of a research group of UNL physics and astronomy professor Evgeny Tsymbal predicted a new effect that could revolutionize the field of microelectronics by allowing faster, smaller and more energy-efficient memory devices. Recently, measurements of the electrical properties of ferroelectric materials performed at the Alexei Gruverman lab led to experimental verification of the predicted behavior. In their paper published online Aug. 21 in Nano Letters, Gruverman, an associate professor of physics and astronomy, and Tsymbal, with co-authors demonstrated a several-orders-of-magnitude change in electrical resistance upon flipping of polarization in ultra-thin ferroelectric films.
Because of their ability to retain permanent electric polarization in the absence of the electric field, for decades ferroelectrics have been the subject of intense development for use in nonvolatile memory, where tiny bits of information are stored as polarization dipoles oriented up and down. The effect discovered at the UNL center could help overcome one of the most serious problems related to miniaturization of charge-based memory technologies ‚Äî reduced charge and increasing leakage current ‚Äî that leads to larger power consumption and progressive loss of stored information. In fact, it can turn this problem into an advantage because it will allow nondestructive read-out of the polarization state of the film simply by measuring its electrical resistance, which can be performed at a significantly lower voltage.
Application of the advanced measurements techniques showed that a single bit of information can be as small as 20 nanometers in diameter (1/1000th diameter of a human hair).
The ferroelectric films for this study were grown by collaborators at the University of Wisconsin, Madison. Funding from the National Science Foundation helps support this research.
Evgeny Tsymbal | Newswise Science News
A paper battery powered by bacteria
21.08.2018 | American Chemical Society
Converting wind power for storage purposes
21.08.2018 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Ecology, The Environment and Conservation
21.08.2018 | Life Sciences
21.08.2018 | Power and Electrical Engineering