Theory of electrical spin injection: Tunnel contacts as a solution of the conductivity mismatch problem

被引:1074
作者
Rashba, EI [1 ]
机构
[1] MIT, Dept Phys, Cambridge, MA 02139 USA
关键词
D O I
10.1103/PhysRevB.62.R16267
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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).
引用
收藏
页码:R16267 / R16270
页数:4
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