The energy dissipated can be as low as 0.4 attojoules, or about a billionth of a billionth of a joule. So this design could create an extremely low-power, yet high-density, non-volatile magnetic logic and memory system. The processors would be well suited for implantable medical devices and could run on energy harvested from the patient's body motion. They also could be incorporated into buoy-mounted computers that would harvest energy from sea waves, among other intriguing possibilities.
http://www.spintronics-info.com/spintronics-and-staintronics-enable-ultra-low-power-ics
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