Local injection of pure spin current generates electric current vortices

TL;DR

This paper demonstrates that injecting pure spin currents locally into a ferromagnetic-normal metal device creates circulating electric currents, which can alter voltage profiles and extend spin accumulation effects.

Contribution

It reveals that pure spin current injection induces closed-loop electric currents within the device, a phenomenon not previously characterized.

Findings

Electric currents form closed loops inside the device.

Voltage distribution is significantly affected by spin current injection.

Long-range spin accumulation tails are induced by these currents.

Abstract

We show that local injection of pure spin current into an electrically disconnected ferromagnetic - normal-metal sandwich induces electric currents, that run along closed loops inside the device, and are powered by the source of the spin injection. Such electric currents may significantly modify voltage distribution in spin-injection devices and induce long-range tails of spin accumulation.