New York June 8 (IANS) In a first scientists have discovered that magnetic properties can exist even in the two dimensional (2-D) realm of mono-layers or materials that are formed by a single atomic layer.
The study proved that material chromium tri-chloride has magnetic properties in the mono-layer form which may open up a world of potential applications possibly in the information technology industry.
What we have discovered here is an isolated 2-D material with intrinsic magnetism and the magnetism in the system is highly robust said Xiaodong Xu Professor at the University of Washington.
We envision that new information technologies may emerge based on these new 2-D magnets Xu added in the paper published in the journal Nature.
Atoms within mono-layer materials are considered functionally two-dimensional because the electrons can only travel within the atomic sheet like pieces on a chessboard.
To discover the properties of the material in its 2-D form the team used Scotch tape to shave a mono-layer off the larger three dimensional (3-D) crystal form.
Surprisingly in chromium tri-chloride flakes that are two layers thick an optical signature demonstrating the magnetic nature disappeared. This signature returns in a three layered structure.
The scientists will need to conduct further studies to understand why the material displayed these remarkable layer-dependent magnetic phases. But to Xu these are just some of the truly unique properties revealed by combining mono-layers.
2-D mono-layers alone offer exciting opportunities to study the drastic and precise electrical control of magnetic properties which has been a challenge to realise using their 3-D bulk crystals Xu mentioned.
But an even greater opportunity can arise when you stack mono-layers with different physical properties together. There you can get even more exotic phenomena not seen in the mono-layer alone or in the 3-D bulk crystal he said.
--IANS
tony/rt/ruwa/bg
Scientists discover two-dimensional magnet
