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Spin-polarized tunneling with Au impurity layers

Gabureac, M.S., Dempsey, K.J., Porter, N.A., Marrows, C.H., Rajauria, S. and Courtois, H. (2008) Spin-polarized tunneling with Au impurity layers. Journal Of Applied Physics, 103 (7). 07A915.

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Abstract

We have inserted nonmagnetic impurity layers of Au into sputtered AlOx-based magnetic tunnel junctions (F/I/F) and Meservey–Tedrow junctions (S/I/F) in order to study their effect on the tunneling magnetoresistance (TMR) and spin polarization (TSP). Both room temperature TMR and the TSP at 250 mK decay exponentially as an interfacial Au layer is introduced between the barrier and one Co electrode, with 1/e decay lengths λTMR=11±3 Å and λTSP=14±2 Å. We also inserted a 1 Å thick Au layer at a variable distance from the barrier/Co interface and find that both the TMR and TSP recover to the undoped value with the shorter exponential length scales of λTMR=7±4 Å and λTSP=6±2 Å.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 American Institute of Physics. This is an author produced version of a paper published in Journal Of Applied Physics. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 16 May 2008 10:30
Last Modified: 14 Jun 2014 18:55
Published Version: http://dx.doi.org/10.1063/1.2839623
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.2839623
URI: http://eprints.whiterose.ac.uk/id/eprint/3794

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