Enhancing the velocity of the single domain wall by current annealing in nanocrystalline FeCoMoB microwires

The effect of current annealing on the velocity of the single domain wall, sDW, and its dynamic stability is investigated in the 80-400K temperature range for FeCoMoB nanocrystalline microwires. In addition to the heating effect of thermal treatments in a conventional field-free furnace, current annealing induces circumferential magnetic anisotropy, which significantly modifies the sDW dynamics characteristics. Such an anisotropy leads to an increased high domain wall velocity with a maximum measured value of about 8 km s(-1). An unexpected increase in the domain wall velocity and mobility at 175K is ascribed to the compensation of the anisotropy distribution. Finally, the domain wall dynamics exhibit very stable behaviour in a wide range of temperatures (200-400 K).