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Quantum rings connected to ballistic circuits couple strongly to externalmagnetic fields if the connection is not symmetric. By analytical theory andcomputer simulation I show that properly connected rings can be used to pumpcurrents in the wires giving raise to a number of interesting new phenomena.One can pump spin polarized currents into the wires by using rotating magneticfields or letting the ring rotate around the wire. This method works withoutany need for the spin-orbit interaction, and without stringent requirementsabout the conduction band filling. On the other hand, another method works athalf filling using a time-dependent magnetic field in the plane of the (fixed)ring. This can be used to pump a pure spin current, excited by the thespin-orbit interaction in the ring. One can use magnetizable bodies as storageunits to concentrate and save the magnetization in much the same way ascapacitors store electric charge. The polarization obtained in this way canthen be used on command to produce spin currents in a wire. These currents showinteresting oscillations while the storage units exchange their polarizationsand the intensity and amplitude of the oscillations can controlled by tuningthe conductance of the wire used to connect the units.

Production, storage and release of spin currents in quantum circuits