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

P. LeClair, J. T. Kohlhepp, C. H. van de Vin, H. Wieldraaijer, H. J.M. Swagten, W. J.M. de Jonge, A. H. Davis, J. M. MacLaren, J. S. Moodera, R. Jansen

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Abstract

Utilizing Co/Al2O3/Co magnetic tunnel junctions with Co electrodes of different crystalline phases, a clear relationship between electrode crystal structure and junction transport properties is presented. For junctions with one fcc(111) textured and one polycrystalline (polyphase and polydirectional) 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 (density of states) of fcc-Co and hcp-Co.
Original languageEnglish
Article number107201
Number of pages4
JournalPhysical Review Letters
Volume88
Issue number10
DOIs
Publication statusPublished - 1 Jan 2002

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