Spin blockade in ferromagnetic nanocontacts

Zhuravlev, M. Ye; Tsymbal, E.Y.; Jaswal, S.S.; Vedyayev, A.V.; Dieny, B.
October 2003
Applied Physics Letters;10/27/2003, Vol. 83 Issue 17, p3534
Academic Journal
Using a free-electron model and a linear response theory we investigate spin-dependent electronic transport in magnetic nanocontacts in the ballistic regime of conduction. We emphasize the fact that in atomic-size ferromagnetic contacts it is possible to achieve the conductance value of e[sup 2]/h, which implies a fully spin-polarized electric current. We explore some consequences of this phenomenon. In particular, we show that the presence of a nonmagnetic region in the nanocontact separating two ferromagnetic electrodes can lead to a spin blockade resulting in very large values of magnetoresistance. © 2003 American Institute of Physics.


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