Figure 1

Figure 1: (a) Regimes of behavior of a 360 DW in the presence of a current and an applied field. In the “spontaneous annihilation” regime, the wall is destroyed by the current. An applied field increases or decreases the annihilation current and thus the maximum velocity of the wall. (b) Resonant behavior of a 360° DW pumped by high-frequency current. Modest applied fields from -20 to 50 Oe shift the resonant frequency from 0.8 to 1.7 GHz.

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