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Applied Physics Letters / Volume 96 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 092501 (2010); http://dx.doi.org/10.1063/1.3332576 (3 pages)

Fe diffusion, oxidation, and reduction at the CoFeB/MgO interface studied by soft x-ray absorption spectroscopy and magnetic circular dichroism

A. T. Hindmarch1, K. J. Dempsey1, D. Ciudad1, E. Negusse2, D. A. Arena3, and C. H. Marrows1

1School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
2Department of Physics, Montana State University, Bozeman, Montana 59717, USA
3National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA

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(Received 8 December 2009; accepted 3 February 2010; published online 1 March 2010)

We have studied the effect of annealing on the interface magnetization in a CoFeB/MgO structure which models the lower electrode in a magnetic tunnel junction device. We find that MgO deposition causes Fe to diffuse toward the CoFeB/MgO interface, where it preferentially bonds with oxygen to form a Fe-O-rich interfacial region with reduced magnetization. After annealing at 375 °C the compositional inhomogeneity remains; Fe is reduced back to a ferromagnetic metallic state and the full interfacial magnetization is regained.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt compounds, diffusion, ferromagnetic materials, interface magnetism, iron compounds, magnesium compounds, magnetic annealing, magnetic circular dichroism, magnetic tunnelling, magnetisation, oxidation, reduction (chemical), X-ray absorption spectra

PACS

  • 75.60.Nt

    Magnetic annealing and temperature-hysteresis effects

  • 82.30.-b

    Specific chemical reactions; reaction mechanisms

  • 78.20.Ls

    Magneto-optical effects

  • 78.70.Dm

    X-ray absorption spectra

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3332576

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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