A new kind of computer memory, called “racetrack” memory, looks set to replace the hard disk as the standard method of storing information on home computers. It promises to be 100 times cheaper than flash memory and has no moving parts – instead, it is the information which moves.
Writing in Physical Review Letters, physicists at the University of Leeds and scientists at IBM Research’s Zurich lab explained how, using a kind of physics called spin transfer, electrons are used to switch the magnetism of bits of the racetrack, pushing them to a different location along a nanowire (watch a video that explains the concept).
“The reason why the hard disk on your computer is likely to break is because it has moving parts which eventually wear out, but the racetrack method of storing information is much more reliable as all the parts are static,” says Dr Chris Marrows, reader in condensed matter physics at the University of Leeds.
Compared with flash memory – the kind of solid state memory found in thumb drives – racetrack memory’s huge advantage is on price. It is estimated that a racetrack memory in a computer would be 100 times cheaper per bit than flash. “Magnetic racetrack memory is designed to replace the hard disk, and it’s estimated that it could compete on price since it’s very dense – it can store lots of bits of data on a small area of chip, as the information is stored in vertical towers,” explained Marrows.