Complex impedance of a spin injecting junction

Rashba, Emmanuel I.
April 2002
Applied Physics Letters;4/1/2002, Vol. 80 Issue 13, p2329
Academic Journal
Theory of the ac spin injection from a ferromagnetic electrode into a normal conductor through a tunnel or Schottky contact is developed. Diffusion and relaxation of nonequilibrium spins results in a frequency-dependent complex impedance Z(ω) controlled by the spin relaxation rates and the resistances involved. Explicit expression for Z(ω) is presented. Experimental investigation of the frequency dependence of Z should allow measuring spin relaxation times in both conductors, their effective resistances, and also the parameters of the contact controlling the spin injection.


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