Theory of electrical spin injection from a ferromagnetic (FM) metal into a normal (N) conductor is presented. We show that tunnel contacts (T) can dramatically increase spin injection and solve the problem of the mismatch in the conductivities of a FM metal and a semiconductor microstructure. We also present explicit expressions for the spin-valve resistance of FM-T-N- and FM-T-N-T-FM-junctions with tunnel contacts at the interfaces and show that the resistance includes both positive and negative contributions (Kapitza resistance and injection conductivity, respectively).
CITATION STYLE
Rashba, E. I. (2000). Theory of electrical spin injection: Tunnel contacts as a solution of the conductivity mismatch problem. Physical Review B - Condensed Matter and Materials Physics, 62(24). https://doi.org/10.1103/PhysRevB.62.R16267
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