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Solid state reaction at the interface between Heusler alloys and Al cap accelerated by elevated temperature and rough surface

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11 Author(s)
Kallmayer, M. ; Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany ; Hild, K. ; Eichhorn, T. ; Schneider, H.
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We have investigated the solid state reaction at the interface of Co2Cr0.6Fe0.4Al, Co2FeSi, and Ni2MnGa Heusler alloy films and Al cap layers using x-ray absorption spectroscopy in transmission and total electron yield mode. At elevated temperatures and at rough surfaces the deposited Al severely reacts with the surface of a Heusler alloy indicated by changes of the absorption spectra. Microspectroscopy using photoemission electron microscopy reveals that the reaction proceeds inhomogeneously with reaction nuclei separated on a micron length scale.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 19 )

Date of Publication:

Nov 2007

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