8/12/2019 Manchester Scientists Find Remarkable Magnetic
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6/12/13 Manchester scientists find remarkable magnetic property
of graphene - FT.com
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Graphene: Invented in the UK, largely being developed
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June 12, 2013 1:46 pm
Manchester scientists find remarkable magnetic
property of grapheneBy Clive Cookson, Science Editor
Scientists at Manchester University, who discovered graphene
just nine years ago, have demonstrated another remarkable property
of
what many have hailed as the first wonder material of the 21st
century.
The latest finding, reported in the journal Nature
Communications, is that microscopic patches of graphene can be made
magnetic and
the magnetism turned on and off with an electric switch.
This could open a new route to electronic devices with extremely
low energy consumption, said Andre Geim, who shared a Nobel
Prize
for the original discovery and is a co-author of research.
A vast range of other applications for graphene are already in
development, from foldable computer displays, better batteries and
solarcells, stronger aircraft wings to new drug delivery
systems.
The Manchester graphene team is the first to show in any
material how to switch magnetism on and off rather than changing
its
direction from north to south and vice versa.
Magnetic materials are key to many information storage devices
including computer discs, which store bits of data through north
or
south polarisation. But flipping orientation is a relatively
slow and energy-consuming process, which has not yet been
incorporated in
active devices such as transistors.
This breakthrough allows us to work towards transistor-like
devices in which information is written down by switching
graphene
between its magnetic and non-magnetic states, said Irina
Grigorieva, head of the Manchester team.
Graphene is the thinnest possible two-dimensional material,
consisting of a sheet of carbon atoms linked in a hexagonal
chicken-wire
pattern. When a few of the carbons are removed or other atoms
added then the magnetic properties emerge.
The Manchester researchers showed that miniature clouds of
electrons form around these holes or additions when a voltage is
applied.
This creates a microscopic magnet that disappears instantly when
the v oltage is removed. The effect can be repeated indefinitely
by
switching the electricity on and off.
I wonder how many more surprises graphene keeps in store, said
Prof Geim. This one has come out of the blue. We have to wait
and
see for a few years but the switchable magnetism may lead to an
impact exceeding most optimistic expectations.
Although graphene is the subject of intense work in labs around
the world, Manchester remains at the forefront of discovery. The 61
m
National Graphene Institute is due to open there in 2015.
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