  Spin pumping is becoming an established method to generate voltages from
magnetic dynamics. The standard detection method of spin pumping is based on
open circuit voltage measurement across ferromagnetic (FM) and non-magnetic
(NM) bi-layers, where the inverse spin-Hall effect (ISHE) can convert spin
currents into electrical charge accumulation. In this paper, we present that it
is also possible to measure the associated electric charge current generated in
FM/NM bi-layers, by using a macroscopic closed circuitry detection method.
Using variable load resistors connected in series to the sample, we quantified
charge currents and associated electric power dissipation as a function of the
load resistance. By using basic circuit analysis, we are able to describe spin
pumping cells as a non-ideal voltage source or equivalent current source with
an internal resistor.
