Pretty cool- I never really understood the difference between SSDs and magnetic hard disks, but I think this article puts it nicely- while hard disks are slower due to the mechanical limitations of the spinning drive, SSDs sometimes aren’t preferred due to higher unreliability. This group at Sheffield found that by using rapidly fluctuating voltage fields, surface acoustic waves can be generated to drive the flow of magnetic data. This is more efficient than using a magnetic field to guide data movement because of 1) the prevention of heat loss that would otherwise arise from magnetic fields or electrical currents and 2) the high speed (100 mph) that data can be transferred. And by tuning the pitch of the waves, directionality can be enforced on the encoded data. Still in the developmental phase, but hopefully we see more on this in the future!