Magnetoelastic Effects and Distribution of Defects in Micrometric Amorphous Wires

The influence of defects and the magnetoelastic anisotropy term on the domain wall dynamics of glass-coated amorphous microwires is investigated. Using modified Sixtus-Tonks set-up, we have determined the position of the domain nucleation and measured the magnetic field dependence of the domain wall velocity. We found that both internal and applied stresses significantly affect the domain wall dynamics especially for wires with reduced magnetostriction. Particularly, we conclude that the non-linear relationship between the do- main wall velocity and magnetic field is correlated with the existence of defects which act as nucleation centers of additional domains.