Nav: Home

How spin dances with dipole

March 21, 2019

Both electric dipoles and spin moments can be ordered in solids, leading to ferro-type phases, e.g. ferromagnetism or ferroelectricity. Generally these two degrees of freedom are not simultaneously active in solids. Multiferroics, are those materials with orders of both spin moments and electric dipoles, which provide an ideal platform for these two vectors to twist together.

Even though, the coupling between magnetism and ferroelectricity is nontrivial since they obey different physical rules. From the symmetric aspect, an electric dipole breaks the spatial inversion symmetry while a spin moment breaks the time reversal symmetry. Microscopically, the existing of net magnetization requires unpaired spin, while the formation of dipole usually needs empty orbitals. Then how can they dance together?

Thanks to the extensive studies in the past decades, now scientists know how to active both degrees of freedom in solids and link them together. In a recent Topical Review by Dong, Xiang, and Dagotto, published in Natl. Sci. Rev., the authors summarize various mechanisms to coupling magnetism and ferroelectricity, which can be categorized to three paths: spin-orbit coupling, spin-lattice coupling, spin-charge coupling. These physical mechanisms have been explained with examples of typical materials.
-end-
This research received funding from the National Natural Science Foundation of China, Special Funds for Major State Basic Research, the Qing Nian Ba Jian Program, the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division.

See the article:
Shuai Dong, Hongjun Xiang and Elbio Dagotto.
Magnetoelectricity in multiferroics: a theoretical perspective
Natl Sci Rev 2018; doi: 10.1093/nsr/nwz023
https://doi.org/10.1093/nsr/nwz023

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 Magnetism Articles:

Stanford physicists discover new quantum trick for graphene: Magnetism
Physicists were stunned when two twisted sheets of graphene showed signs of superconductivity.
Utrafast magnetism: Electron-phonon interactions examined at BESSY II
How fast can a magnet switch its orientation and what are the microscopic mechanisms at play ?
Experimental physicists redefine ultrafast, coherent magnetism
For the first time ever, experimental physicists have been able to influence the magnetic moment of materials in sync with their electronic properties.
A new 2D magnet draws future devices closer
EPFL scientists have discovered a new type of 2D magnetic material that can be integrated into spintronic devices.
Magnetism discovered in the Earth's mantle
The well-known sources of the magnetic field that surrounds the Earth are the deep inside core and the Earth's crust.
More Magnetism News and Magnetism Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Erasing The Stigma
Many of us either cope with mental illness or know someone who does. But we still have a hard time talking about it. This hour, TED speakers explore ways to push past — and even erase — the stigma. Guests include musician and comedian Jordan Raskopoulos, neuroscientist and psychiatrist Thomas Insel, psychiatrist Dixon Chibanda, anxiety and depression researcher Olivia Remes, and entrepreneur Sangu Delle.
Now Playing: Science for the People

#537 Science Journalism, Hold the Hype
Everyone's seen a piece of science getting over-exaggerated in the media. Most people would be quick to blame journalists and big media for getting in wrong. In many cases, you'd be right. But there's other sources of hype in science journalism. and one of them can be found in the humble, and little-known press release. We're talking with Chris Chambers about doing science about science journalism, and where the hype creeps in. Related links: The association between exaggeration in health related science news and academic press releases: retrospective observational study Claims of causality in health news: a randomised trial This...