Interaction of a magnetic domain wall with an electric current

Abstract

The electromagnetic interaction between a wall separating two magnetic domains and an impressed electric current is studied in quasistatic approximation. In this case, unlike the related eddy‐current loss problem, the wall velocity calculation requires explicit consideration of magnetic losses which limit the wall velocity, otherwise the wall velocity v would reach the carrier drift velocity v_D. For a magnetic bubble in a material having wall mobility μ_ω and coercive force H_c, we calculate ${\text{ν=[1−(4/π)(H}}_c{\mathrm{/H}}_d^0{\mathrm{)]\nu }}_D{\nu }_m{\mathrm{/(\nu }}_D{\mathrm{+\nu }}_m)$ , where $H_d^0$ is a calculated drive field and ${\nu }_m{\mathrm{=\mu }}_{\omega }{H}_d^0$ .