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Interface characterization in Pd-Fe-Al(oxide)-Fe systems using conversion electron mossbauer spectroscopy

Schmitt, H. and Stahl, B. and Ghafari, M. and Hahn, Horst (2005):
Interface characterization in Pd-Fe-Al(oxide)-Fe systems using conversion electron mossbauer spectroscopy.
In: Journal of Applied Physics, (11), 97. pp. 113902-1, [Article]

Abstract

A Fe–Al(oxide)-bilayer was deposited on a thermally oxidized and Pd-buffered Si substrate. In order to elucidate the structural and magnetic properties of the insulators lower interface by Mössbauer spectroscopy, a thin math tracer was placed at the Al(oxide) interface. Conversion electron Mössbauer spectroscopy at room temperature and 30 K revealed the changes at the interface after Al deposition and its oxidation with molecular oxygen. This nuclear probe technique can resolve the different phases that appear during the different preparation steps. The magnetic hyperfine splitting and the isomer shift give information about the chemical, structural, and magnetic orders. This is important for an understanding of magnetoresistance in likewise composed tunneling magnetoresistance samples. A transmission electron microscopy image of a layered reference system Pd–Fe–Al2O3–Fe confirms the layered structure of the sample and the lower interface between Fe and Al (Al2O3).

Item Type: Article
Erschienen: 2005
Creators: Schmitt, H. and Stahl, B. and Ghafari, M. and Hahn, Horst
Title: Interface characterization in Pd-Fe-Al(oxide)-Fe systems using conversion electron mossbauer spectroscopy
Language: English
Abstract:

A Fe–Al(oxide)-bilayer was deposited on a thermally oxidized and Pd-buffered Si substrate. In order to elucidate the structural and magnetic properties of the insulators lower interface by Mössbauer spectroscopy, a thin math tracer was placed at the Al(oxide) interface. Conversion electron Mössbauer spectroscopy at room temperature and 30 K revealed the changes at the interface after Al deposition and its oxidation with molecular oxygen. This nuclear probe technique can resolve the different phases that appear during the different preparation steps. The magnetic hyperfine splitting and the isomer shift give information about the chemical, structural, and magnetic orders. This is important for an understanding of magnetoresistance in likewise composed tunneling magnetoresistance samples. A transmission electron microscopy image of a layered reference system Pd–Fe–Al2O3–Fe confirms the layered structure of the sample and the lower interface between Fe and Al (Al2O3).

Journal or Publication Title: Journal of Applied Physics
Journal volume: 97
Number: 11
Uncontrolled Keywords: alumina, palladium, iron, magnetic multilayers, Mossbauer effect, oxidation, hyperfine interactions, tunnelling magnetoresistance, transmission electron microscopy, ferromagnetic materials, magnetic thin films
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 20 Nov 2008 08:21
License: [undefiniert]
Funders: This work was funded in part by the Deutsche Forschungsgemeinschaft (DFG).
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