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Optimized thickness of superconducting aluminum electrodes for measurement of spin polarization with MgO tunnel barriers

Appl. Phys. Lett. 90, 202502 (2007); doi:10.1063/1.2739333

Published 15 May 2007

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Hyunsoo Yang, See-Hun Yang, and Stuart S. P. Parkin
IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120

Titus Leo and David J. Smith
School of Materials, Arizona State University, Tempe, Arizona 85287 and Department of Physics, Arizona State University, Tempe, Arizona 85287
Superconducting tunneling spectroscopy (STS) is one of the most useful techniques for measuring the tunneling spin polarization of magnetic materials, typically carried out using aluminum electrodes. Recent studies using MgO barriers have shown the extreme sensitivity of the spin polarization to annealing at temperatures up to ~400  °C. Here the authors show that by optimizing the thickness of aluminum superconducting electrodes, STS measurements can be carried out even for such high annealing temperatures. ©2007 American Institute of Physics
History: Received 9 November 2006; accepted 23 April 2007; published 15 May 2007
Permalink: http://link.aip.org/link/?APPLAB/90/202502/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.50.+r
    Tunneling phenomena; point contacts, weak links, Josephson effects in superconductors
  • 74.70.Ad
    Superconducting metals; alloys and binary compounds (including A15, MgB2, etc.)
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (15)
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