In situ monitoring of electric field effect on domain wall motion in Co ultrathin films in direct contact with an electrolyte

We present experimental data on the electric field effect on the magnetic domain wall dynamics in Co ultrathin films in direct contact with an aqueous electrolyte and in the absence of any oxide layer. We use a three electrode electrochemical setup to apply a large and uniform electric field and to precisely separate chemical effects induced by hydrogen from pure electric field effects. We show that in the case of the pure electric field effect, the domain wall velocity varies exponentially with the electric field and that these variations are larger than those observed previously on similar systems due to a larger magnetoelectric coefficient in our case.