Band Structure and Density of States Effects in Co-Based Magnetic Tunnel Junctions

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LeClair, P. and Kohlhepp, J.T. and Vin, C.H. van de and Wieldraaijer, H. and Swagten, H.J.M. and Jonge, W.J.M. de and Davis, A.H. and MacLaren, J.M. and Moodera, J.S. and Jansen, R. (2002) Band Structure and Density of States Effects in Co-Based Magnetic Tunnel Junctions. Physical Review Letters, 88 (10). 107201-1-107201-4. ISSN 0031-9007

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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.
Item Type:Article
Copyright:© 2002 The American Physical Society
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Link to this item:http://purl.utwente.nl/publications/44239
Official URL:http://dx.doi.org/10.1103/PhysRevLett.88.107201
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