Rashba, Emmanuel2016-03-152000Rashba, E. I. 2000. “Theory of Electrical Spin Injection: Tunnel Contacts as a Solution of the Conductivity Mismatch Problem.” Physical Review B 62 (24) (December 15): R16267–R16270. doi:10.1103/physrevb.62.r16267.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:25872797Theory 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).en-USJournal Article2016-01-29E. I. Rashba2016-03-1510.1103/physrevb.62.r16267