Initially two grains have different magnetic orientation (black and white respectively), but 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
A recent study has shown that heat can be used to magnetically store data on tiny magnetic grains
For the past several decades, it has been assumed that in order to store data on a magnetic medium, a magnetic field must be applied. Recently, however, an international team of scientists discovered that heat can be used instead of a magnetic field. Not only is this method reportedly more energy efficient, but it also theoretically allows for ten times the storage capacity and 300 times the performance of current hard drive technology.
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