Electric field driven switching of individual magnetic skyrmions
  Controlling magnetism with electric fields is a key challenge to develop future energy-efficient devices, however, the switching between inversion symmetric states, e.g. magnetization up and down as used in current technology, is not straightforward, since the electric field does not break time-reversal symmetry. Here, we demonstrate that local electric fields can be used to reversibly switch between a magnetic skyrmion and the ferromagnetic state. These two states are topologically inequivalent, and we find that the direction of an electric field directly determines the final state. This observation establishes the possibility to combine energy-efficient electric field writing with the recently envisaged skyrmion racetrack-type memories. 
Pin-Jui Hsu, Andr\'e Kubetzka, Aurore Finco, Niklas Romming, Kirsten   von Bergmann, Roland Wiesendanger
cond-mat.mes-hall