Complex impedance of a spin injecting junction

Details Complex impedance of a spin injecting junction Complex impedance of a spin injecting junction

2002-02-14

arxiv.org/abs/cond-mat/0202222v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 2 column REVTeX, to appear in Appl. Phys. Lett

Scientific paper

10.1063/1.1465527

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 non-equilibrium spins results in a frequency dependent complex impedance controlled by the spin relaxation rates and the resistances involved. Explicit expression for the impedance is presented. Experimental investigation of the frequency dependence of the impedance 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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