Oxygen-induced symmetrization and structural coherency in Fe/MgO/Fe(001) magnetic tunnel junctions

被引：103

作者：

Tusche, C

Meyerheim, HL

Jedrecy, N

Renaud, G

Ernst, A

Henk, J

Bruno, P

Kirschner, J

机构：

[1] Max Planck Inst Mikrostrukturphys, D-06120 Halle An Der Saale, Germany

[2] Univ Paris 06, Inst NanoSci Paris, F-75252 Paris, France

[3] Univ Paris 07, Inst NanoSci Paris, F-75252 Paris, France

[4] CNRS, UMR 7588, F-75252 Paris, France

[5] CEA Grenoble, F-38054 Grenoble, France

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.95.176101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present x-ray diffraction experiments and multiple-scattering calculations on the structure and transport properties of a Fe/MgO/Fe(001) magnetic tunnel junction (MTJ). Coherent growth of the top Fe electrode on the MgO spacer is observed only for Fe deposition in ambient oxygen atmosphere leading to a coherent and symmetric MTJ structure characterized by FeO layers at both Fe/MgO interfaces. This goes in parallel with calculations indicating large positive tunnel magnetoresistance (TMR) values in such symmetric junctions. The results have important implications for achieving giant TMR values.

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