IBM racetrack memory

Racetrack memory is a type of non-volatile, solid state nanotech memory being developed by IBM.

Racetrack memory works by storing oppositely oriented magnetic regions in nanowires called racetracks. Electric pulses, which are generated by a transistor, are applied to the nanowires, creating domain walls with regions between them. When regions pass over a quantum mechanical magnetic read/write head, they are oriented in opposite directions. Oriented one way, a bit represents a "1". Oriented the other way, it represents a "0".

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Racetrack memory, along with phase change memory, is being looked by IBM as a way to develop solid-state devices capable of holding up to 100 times more data than is possible today.