Heat used to record information

An international team of scientists has demonstrated a new way of magnetic recording which will allow information to be processed hundreds of times faster than by current hard drive technology.

The researchers found they could record information using only heat. They believe this discovery will not only make future magnetic recording devices faster but also more energy efficient.

The research was led by Britain’s University of York’s Department of Physics.

York physicist Thomas Ostler said: “Instead of using a magnetic field to record information on a magnetic medium, we harnessed much stronger internal forces and recorded information using only heat. This allows the recording of terabytes of information per second, hundreds of times faster than present hard drive technology. As there is no need for a magnetic field, there is also less energy consumption.”

The multinational team of scientists included researchers from Spain, Switzerland, the Ukraine, Russia, Japan and the Netherlands. Experimental work was carried out at the Paul Scherrer Institut in Switzerland, the Ioffe Physical Technical Institute of the Russian Academy of Sciences and Radboud University Nijmegen in the Netherlands.

Dr Alexey Kimel, from the Institute of Molecules and Materials, at Radboud University Nijmegen, said:

“For centuries it has been believed that heat can only destroy the magnetic order. Now we have demonstrated that it can, in fact, be a sufficient stimulus for recording information on a magnetic medium.”

Modern magnetic recording employs the principle that the north pole of a magnet is attracted to the south pole of another and two like poles repel. Until now it has been believed that to record one bit of information - by inverting the poles of a magnet - there was a need to apply an external magnetic field. The stronger the applied field, the faster the recording of a magnetic bit of information.

However, the team has demonstrated that the positions of both the north and south poles of a magnet can be inverted by an ultrashort heat pulse, harnessing the power of much stronger internal forces of magnetic media.