  We describe the coherent interaction between a defect spin at the interface
of a ferromagnet and a non-magnetic material, under bias and when the
magnetization of the ferromagnetic contact precesses during ferromagnetic
resonance. The magnet filters charge carriers by preferentially allowing in
parallel spins, which leads to a dynamic spin accumulation on the defect. Local
effective fields acting on the defect spin site modify the defect spin's
precession, which also modifies the charge current through the defect. This new
form of current-detected spin resonance reveals the local environment of the
defect, and thus can yield the defect identity.
