Domain wall dynamics of magnetically bistable microwires

¹ Dpto. Fisica de Materiales, Fac. Quimicas, UPV/EHU, 20009 San Sebastian, Spain
² Dpto. de Física Aplicada, EUPDS, UPV/EHU, 200018, San Sebastian, Spain
³ IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain

^a e-mail: arkadi.joukov@ehu.es

Abstract

We studied domain wall propagation of magnetically-bistable Fe- Co-rich microwires paying attention on effect of applied and internal stresses. We measured hysteresis loops and domain wall propagation in various magnetic Fe- Co-rich amorphous microwires with metallic nucleus diameters (from 12 □m till 22 □m) using Sixtus Tonks-like experiments. Application of tensile stresses results in decreasing of domain wall velocity. We discussed magnetoelastic contribution in dynamics of domain wall propagation. We observed, that microwires with different geometries exhibit v(H) dependences with different slopes. Application of stresses resulted in decrease of DW velocity, v, and DW mobility S. Quite fast DW propagation (v till 2500 m/s at H about 30 A/m) has been observed in low magnetostrictive magnetically bistable Co₅₆Fe₈Ni₁₀Si₁₁₀B₁₆ microwires. Consequently, we can assume that generally magnetoelastic energy affects DW dynamics: decreasing magnetoelastic energy, K_me, DW velocity increases.