Microcharacterization of the surface oxidation of Py/Cu multilayers by scanning X-ray absorption spectromicroscopy |
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| Authors: | U Kleineberg G Haindl A Hütten G Reiss EM Gullikson MS Jones S Mrowka SB Rekawa JH Underwood |
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| Institution: | (1) University of Bielefeld, Faculty of Physics, Universitaetsstr. 25, 33615 Bielefeld, Germany, DE;(2) Lawrence Berkeley National Laboratory, Center for X-Ray Optics, 1 Cyclotron Road, Berkeley, CA 94720, USA, US |
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| Abstract: | The local surface oxidation of the permalloy surface layer in Py/Cu GMR multilayers on a micron lateral scale has been analyzed
by means of a microspot-X-ray absorption spectromicroscope utilizing synchrotron radiation from the Advanced Light Source
bending magnet beamline 6.3.2. Additionally, the GMR multilayer samples prepared by dc magnetron sputtering have been analyzed
by cross-sectional transmission electron microscopy, hard X-ray reflection and magnetoresistance measurements. The formation
of a passivating iron-oxide layer on the sample surface was identified by X-ray absorption near edge structure spectroscopy
(XANES) near the Fe-2p edge while no indication for nickel-oxide formation could be found. Small micron-size pits of reduced
iron-oxide concentration could be identified by XANES microscopy while the corresponding nickel distribution appeared to be
homogeneous. The results are explained in terms of a local breakdown of the passivating oxide layer.
Received:16 October 2000 / Accepted: 4 December 2000 / Published online: 21 March 2001 |
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| Keywords: | PACS: 07 85 Qe 61 10 Ht 75 70 Pa |
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