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We show that to correctly describe the ultrafast currents in spintronic THzemitters it is necessary to take charge equilibration into account. The chargecurrent which is locally induced by a fs laser pulse and the inverse spin-Halleffect (ISHE) leads to ultrafast charging phenomena at the edge of theilluminated area. Subsequent discharging leads to a current backflow with adelay and a time constant that mainly depends on the conductivity of theemitter. On the one hand, only this delayed charge equilibration allows thedetection of the primary current pulse via THz emission because aninstantaneous backflow would cancel any far field emission. On the other hand,especially for longer light pulses the backflow can significantly change theemitted spectrum compared to the initial spin-current pulse by suppressing lowfrequency components. For the analysis of spin physics based on the chargecurrent profile it is important to understand that the timing of the spincurrent cannot be inferred from the charge current unless the contribution bythe ISHE and the backflow can be deconvoluted.

Charge dynamics in spintronic THz emitters