"An international team of scientists has demonstrated a revolutionary 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 - a previously unimaginable scenario. They believe this discovery will not only make future magnetic recording devices faster, but more energy-efficient too.
Experimental images showing the repeated deterministic switching of nano islands. Initially the two nano islands have different magnetic orientation (black and white respectively). After the application of a single pulse, the magnetic direction of both islands changes. Further pulses repeat the process, switching the magnetic state back and forth.
Credit: Johan Mentink and Alexey Kimel, Radboud University Nijmegen; Richard Evans, University of York
The results of the research, which was led by the University of York's Department of Physics, are reported in the February edition of Nature Communications.
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 revolutionary method allows the recording of Terabytes (thousands of Gigabytes) 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.'
Visualisation of ultrafast heat-induced magnetic switching. Before the laser pulse, the two components of the ferrimagnetic material Fe (Blue) and Gd (Red) are aligned anti-parallel to each other. The 60 femtosecond duration laser pulse rapidly heats the material and this alone induces a transient ferromagnetic-like state, where the Fe and Gd moments are aligned in parallel. After the laser pulse the moments relax to their usual state completing a single switching event in less than 5 picoseconds.
Credit: Richard Evans, University of York
The multinational team of scientists included researchers from Spain, Switzerland, 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, Netherlands.
Dr Alexey Kimel, from the Institute of Molecules and Materials, Radboud University Nijmegen, said: 'For centuries it has been believed that heat can only destroy the magnetic order. Now we have successfully demonstrated that it can, in fact, be a sufficient stimulus for recording information on a magnetic medium.'
The ultimate magnetic storage medium, consisting of many individual nanometre sized magnetic grains with a density of 10 petabytes/m^2. The data is written to the device using an ultrafast heating process to drive the reversal at a data rate of 200Gb/s. Compared to today's hard drive technology this would allow 10 times the amount of storage capacity and 300 times the performance.
Credit: Richard Evans, University of York
Modern magnetic recording technology employs the principle that the North pole of a magnet is attracted to the South pole of another and two like poles repulse. Until now it has been believed that in order 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 of scientists 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.
Citation: 'Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet' is published in Nature Communications on Tuesday, 7 February.http://dx.doi.org/10.1038/ncomms1666"
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