This year's Nobel Prize in Physics has been awarded to Albert Fert and Peter Grünberg for their discovery of Giant Magnetoresistance in the retrieval of data from hard disks.
Fert is from the Unité Mixte de Physique CNRS/THALES at the Université Paris-Sud, Orsay, and Grünberg is based at the Institut für Festkörperforschung, Forschungszentrum Jülich, Germany.
This year's physics prize has been awarded for the technology that is used to read data on hard disks. It is thanks to this technology that it has been possible to radically miniaturise hard disks in recent years.
Sensitive read-out heads are needed to be able to read data from the compact hard disks used in laptops and some music players, for instance.
In 1988, Fert and Grünberg each independently discovered a totally new physical effect - Giant Magnetoresistance or GMR.
Very weak magnetic changes give rise to major differences in electrical resistance in a GMR system. A system of this kind is the perfect tool for reading data from hard disks when information registered magnetically has to be converted to electric current.
Soon researchers and engineers began work to enable the use of the effect in read-out heads. In 1997 the first read-out head based on the GMR effect was launched and this soon became the standard technology.
Even the most recent read-out techniques of today are further developments of GMR.
A hard disk stores information, such as music, in the form of microscopically small areas magnetised in different directions.
The information is retrieved by a read-out head that scans the disk and registers the magnetic changes. The smaller and more compact the hard disk, the smaller and weaker the individual magnetic areas.
More sensitive read-out heads are therefore required if information has to be packed more densely on a hard disk. A read-out head based on the GMR effect can convert very small magnetic changes into differences in electrical resistance and therefore into changes in the current emitted by the read-out head.
The current is the signal from the read-out head and its different strengths represent ones and zeros.
The GMR effect was discovered thanks to techniques developed during the 1970s to produce very thin layers of different materials.
If GMR is to work, structures consisting of layers that are only a few atoms thick have to be produced. For this reason GMR can also be considered one of the first real applications of the promising field of nanotechnology, said the Royal Swedish Academy of Sciences, which gives out the Nobel awards.