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Interaction between local magnetization and conduction electrons isresponsible for a variety of phenomena in magnetic materials. It has beenrecently shown that spin current and associated electric voltage can be inducedby magnetization that depends on both time and space. This effect, calledspinmotive force, provides for a powerful tool for exploring the dynamics andthe nature of magnetic textures, as well as a new source for electromotiveforce. Here we theoretically demonstrate the generation of electric voltages inmagnetic bubble array systems subjected to a magnetic field gradient. It isshown by deriving expressions for the electric voltages that the present systemoffers a direct measure of phenomenological parameter that describesnon-adiabaticity in the current induced magnetization dynamics. This spinmotiveforce opens a door for new types of spintronic devices that exploit thefield-gradient.

Spinmotive force due to motion of magnetic bubble arrays driven by magnetic field gradient