The inductance of spintronic devices that transport charge neutral spincurrents is discussed. It is known that in a media that contains charge neutralspins, a time-varying electric field induces a spin current. We show that sincethe spin current itself produces an electric field, this implies existence ofinductance and electromotive force when the spin current changes with time. Therelations between the electromotive force and the corresponding flux, which isa vector calculated by the cross product of electric field and the trajectoryof the device, are clarified. The relativistic origin generally renders anextremely small inductance, which indicates the advantage of spin current inbuilding low inductance devices. The same argument also explains the inductancedue to electric dipole current, and applies to physical dipoles consist ofpolarized bound charges.
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