On-time characterization of the dynamics of a single-domain wall in an amorphous microwire

Abstract In this chapter, we describe how the time-resolved domain wall velocity can be achieved from the simultaneous measurement of the spontaneous Matteucci effect exhibited by Fe-rich microwires and the classical Sixtus-Tonks average velocity. The processes of nucleation, acceleration, and braking of the domain wall have been identified and analyzed in comparison with the theoretical velocity calculated assuming a domain wall that behaves like a punctual mass. This powerful tool together with the application of local magnetic fields has permitted to perform the time-resolved control of the magnetization reversal process. Depending on the sign of the local field with respect to the driving field, it is possible to locally brake and/or trap the domain wall (local field antiparallel to the driving field) as well as to inject domain walls (local field parallel to the driving field) and identify and characterize the processes of nucleation and annihilation.