Theory of spin-coherent transport through a defect spin state in a metal/ferromagnet tunnel junction during ferromagnetic resonance

摘要

We describe the coherent interaction between a defect spin at the interfaceof a ferromagnet and a non-magnetic material, under bias and when themagnetization of the ferromagnetic contact precesses during ferromagneticresonance. The magnet filters charge carriers by preferentially allowing inparallel spins, which leads to a dynamic spin accumulation on the defect. Localeffective fields acting on the defect spin site modify the defect spin'sprecession, which also modifies the charge current through the defect. This newform of current-detected spin resonance reveals the local environment of thedefect, and thus can yield the defect identity.