Time-resolved velocity of a domain wall in a magnetic microwire

The dynamic process of nucleation, propagation, and braking of a single domain wall (DW) has been systematically determined in a Fe-based magnetostrictive microwire under an applied axial magnetic field. While in previous reports the Sixtus-Tonks experiments have provided partial information on the process (i.e., the average velocity), in the present study we report on the instantaneous processes involved in the propagation of the DW, as well as the transient process during the DW depinning. The experimental measurements were carried out using the spontaneous Matteucci effect induced during DW propagation due to the small helical magnetization component created during the fabrication process.