In Brief: Nanodots to the rescue

May 11, 2011

By applying the magnetic properties of iron nanodots to complex materials, a research team has overcome an obstacle to getting ultra-thin or highly strained films to perform on par with their bulk counterparts.

If the researchers are indeed successful, this work sets the stage for these exotic materials to be used in a wide range of fascinating and potentially technologically revolutionary applications, said Oak Ridge National Laboratory's Zac Ward, lead author of a paper published in .

The problem lies in the fact that at low dimensions or when the material is under strain it loses the characteristics that make it valuable for use in nano-scale electronics.

"What we discovered is a way to activate these materials using the of iron nanodots to control the electron spin and tune the behavior," Ward said.

Explore further: A nanosized hydrogen generator

More information: Tuning the Metal-Insulator Transition in Manganite Films through Surface Exchange Coupling with Magnetic Nanodots, Phys. Rev. Lett. 106, 157207 (2011) DOI:10.1103/PhysRevLett.106.157207

Abstract
In strongly correlated electronic systems, the global transport behavior depends sensitively on spin ordering. We show that spin ordering in manganites can be controlled by depositing isolated ferromagnetic nanodots at the surface. The exchange field at the interface is tunable with nanodot density and makes it possible to overcome dimensionality and strain effects in frustrated systems to greatly increasing the metal-insulator transition and magnetoresistance. These findings indicate that electronic phase separation can be controlled by the presence of magnetic nanodots.

add to favorites email to friend print save as pdf

Related Stories

Highlight: Exploiting strain fields

Dec 10, 2009

(PhysOrg.com) -- Electronic devices of the future may benefit from a fundamental discovery that allows researchers to customize the electronic properties of complex materials such as single-crystal thin-film structures.

Unexpected magnetism discovered

Oct 18, 2010

Theoretical work done at the Department of Energy's Oak Ridge National Laboratory has provided a key to understanding an unexpected magnetism between two dissimilar materials.

Recommended for you

A nanosized hydrogen generator

12 hours ago

(Phys.org) —Researchers at the US Department of Energy's (DOE) Argonne National Laboratory have created a small scale "hydrogen generator" that uses light and a two-dimensional graphene platform to boost ...

For electronics beyond silicon, a new contender emerges

Sep 16, 2014

Silicon has few serious competitors as the material of choice in the electronics industry. Yet transistors, the switchable valves that control the flow of electrons in a circuit, cannot simply keep shrinking ...

Making quantum dots glow brighter

Sep 16, 2014

Researchers from the University of Alabama in Huntsville and the University of Oklahoma have found a new way to control the properties of quantum dots, those tiny chunks of semiconductor material that glow ...

The future face of molecular electronics

Sep 16, 2014

The emerging field of molecular electronics could take our definition of portable to the next level, enabling the construction of tiny circuits from molecular components. In these highly efficient devices, ...

User comments : 0