Effect: We have demonstrated that the shape of
the Hanle
curve (non-local resistance versus applied magnetic field) can be manipulated
using an ac drive.
Finding: The application of a circularly
polarized ac drive modifies the shape of the Hanle curve by breaking its symmetry.
Surprisingly, we find that a magnetic resonance manifests itself as a feature
in the Hanle
curve.
Significance: Application of an ac drive reveals
delicate features of the spin-transport and allows for in depth tests of the
“drift-diffusion” description of spin-transport.
Schematic
diagram of a spin-transport device under an ac drive.
Evolution of the Hanle
curve with intensity of a circularly polarized ac drive. Inset and derivative (right panel) show the
signature of magnetic resonance.
