Observation of band structure and density of states effects in Co-based magnetic tunnel junctions

Details Observation of band structure and density of states effects in Co-based magnetic tunnel junctions Observation of band structure and density of states effects in Co-based magnetic tunnel junctions

2001-07-27

arxiv.org/abs/cond-mat/0107569v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.107201

Utilizing Co/Al$_2$O$_3$/Co magnetic tunnel junctions (MTJs) with Co electrodes of different crystalline phases, a clear relationship between electrode structure and junction transport properties is presented. For junctions with one fcc(111) textured and one polycrystalline (poly-phase and poly-directional) Co electrode, a strong asymmetry is observed in the magnetotransport properties, while when both electrodes are polycrystalline the magnetotransport is essentially symmetric. These observations are successfully explained within a model based on ballistic tunneling between the calculated band structures (DOS) of fcc-Co and hcp-Co.

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