A spin cell for spin current

We propose and investigate a spin-cell device which provides the necessary spin-motive force to drive a spin current for future spintronic circuits. Our spin cell has four basic characteristics: (1) it has two poles with a spin current flowing in from one pole and out from the other, so that a complete spin circuit can be established; (2) it has a source of energy to drive the spin current; (3) it maintains spin coherence so that a sizable spin current can be delivered; (4) it drives a spin current without a net charge current. This cell should be realizable using technologies presently available.