Asymmetry and separation of spin tunneling time in ZnSe/Zn1-xMnxSe multilayers

We investigate characteristics of spin tunneling time in ZuSe/Ze(1-x)MnSe m ultilayers under the influence of both an electric field and a magnetic fie ld. The results indicate that the tunneling time shows complicated oscillat ions and significant spin separation for electrons with different spin orie ntations traversing semimagnetic semiconductor heterostructures. It is also shown that the tunneling time exhibits obvious asymmetry in opposite tunne ling directions for electrons tunneling through asymmetric heterostructures , which mainly occurs in resonant regions. The degree of the asymmetry of t he tunneling time is not only spin-polarization dependent but also external -field induced.