  Efficient control of magnetism with electric means is a central issue of
current spintronics research, which opens an opportunity to design integrated
spintronic devices. However, recent well-studied methods are mostly based on
electric-current injection, and they are inevitably accompanied by considerable
energy losses through Joule heating. Here we theoretically propose a way to
exert spin torques into magnetic bilayer systems by application of electric
voltages through taking advantage of the Rashba spin-orbit interaction. The
torques resemble the well-known electric-current-induced torques, providing
similar controllability of magnetism but without Joule-heating energy losses.
The torques also turn out to work as an interfacial Dzyaloshinskii-Moriya
interaction which enables us to activate and create noncollinear magnetism like
skyrmions by electric-voltage application. Our proposal offers an efficient
technique to manipulate magnetizations in spintronics devices without
Joule-heating energy losses.
