Manipulation of domain wall dynamics in amorphous microwires through domain wall collision

Abstract

Experimental results of the magnetic field driven domain walls dynamics in magnetically bistable Fe-rich microwires are reported. We have observed that under certain conditions a controllable domain wall (DW) collision can be realized in different parts of the wire, and that it is possible to manipulate the DW dynamics in a field-driven regime. The DW collisions obtained in this way can be used to release pinned domain walls. We have also found a correlation between the local nucleation field distribution and field dependence of DW velocity: the magnetic field value corresponding to the minimum nucleation field determines a threshold between single and multiple domain wall propagation regimes.