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Determination of the thickness of Al2O3 barriers in magnetic tunnel junctions.

Buchanan, J. D. R. and Hase, T. P. A. and Tanner, B. K. and Hughes, N. D. and Hicken, R. J. (2002) 'Determination of the thickness of Al2O3 barriers in magnetic tunnel junctions.', Applied physics letters., 81 (4). pp. 751-753.

Abstract

The barrier thickness in magnetic spin-dependent tunnel junctions with Al2O3 barriers has been measured using grazing incidence x-ray reflectivity and by fitting the tunneling current to the Simmons model. We have studied the effect of glow discharge oxidation time on the barrier structure, revealing a substantial increase in Al2O3 thickness with oxidation. The greater thickness of barrier measured using grazing incidence x-ray reflectivity compared with that obtained by fitting current density-voltage to the Simmons electron tunneling model suggests that electron tunneling is localized to specific regions across the barrier, where the thickness is reduced by fluctuations due to nonconformal roughness.

Item Type:Article
Keywords:Aluminum oxides, Cobalt, Electron spin, Electron tunneling, Ferromagnetic materials, Grazing incidence, Insulation, Insulators, Magnetic materials, Magnetic properties, Magnetoresistivity, MIM (semiconductors), Permalloys (trademark), Polarization.
Full text:PDF - Published Version (50Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.1496131
Publisher statement:Copyright (2002) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. Buchanan, J. D. R. and Hase, T. P. A. and Tanner, B. K. and Hughes, N. D. and Hicken, R. J. (2002) 'Determination of the thickness of Al2O3 barriers in magnetic tunnel junctions.', Applied physics letters., 81 (4). pp. 751-753. and may be found at http://link.aip.org/link/?apl/81/751
Record Created:09 Jan 2009
Last Modified:21 Apr 2011 13:09

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