Disturbance of tunneling coherence by oxygen vacancy in epitaxial Fe/MgO/Fe magnetic tunnel junctions.

Miao, G X; Park, Y J; Moodera, J S; Seibt, M; Eilers, G; Münzenberg, M

Miao, G X; Park, Y J; Moodera, J S; Seibt, M; Eilers, G; Münzenberg, M.

Afiliación

Miao GX; Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. gxmiao@mit.edu

Phys Rev Lett ; 100(24): 246803, 2008 Jun 20.

Article en En | MEDLINE | ID: mdl-18643609

RESUMEN

Oxygen vacancies in the MgO barriers of epitaxial Fe/MgO/Fe magnetic tunnel junctions are observed to introduce symmetry-breaking scatterings and hence open up channels for noncoherent tunneling processes that follow the normal WKB approximation. The evanescent waves inside the MgO barrier thus experience two-step tunneling, the coherent followed by the noncoherent process, and lead to lower tunnel magnetoresistance, higher junction resistance, as well as increased bias and temperature dependence. The characteristic length of the symmetry scattering process is determined to be about 1.6 nm.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2008 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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