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A single ferromagnetic NOT gate. The domain wall travels from left to right, switching the magnetization state of the bend - and therefore its logical value - as it goes. (Picture credit: Russell Cowburn, University of Durham)

A single ferromagnetic NOT gate. The domain wall travels from left to right, switching the magnetization state of the bend - and therefore its logical value - as it goes. (Picture credit: Russell Cowburn, University of Durham)