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Interfacial microstructure of Fe∕AlO[sub x]∕Fe magnetic tunnel junctions in high resolution

Schmitt, H. and Ghafari, M. and Kruk, R. and Ellrich, J. and Hütten, A. and Schmitt, L. A. and Hahn, H. (2006):
Interfacial microstructure of Fe∕AlO[sub x]∕Fe magnetic tunnel junctions in high resolution.
In: Applied Physics Letters, 88 (12), American Institute of Physics, pp. 122505-3-122505-3, ISSN 00036951,
[Online-Edition: http://dx.doi.org/10.1063/1.2186991],
[Article]

Abstract

Magnetic tunnel junctions were prepared by deposition of a Ta-buffered Fe-AlOx-Fe trilayer on a thermally oxidized silicon wafer. In order to investigate the influence of different Fe oxides like a spinel-like phase and a spinel (Hycernite) on the tunneling magnetoresistance effect, a 57Fe tracer was deposited at the lower barrier interface. Using conversion electron Mössbauer spectroscopy the evolution of chemical, structural, and magnetic changes in the tracer was monitored starting from the as-prepared state and after several annealing steps. The nuclear probe technique enables to resolve phase formation at the interface with submonolayer resolution.

Item Type: Article
Erschienen: 2006
Creators: Schmitt, H. and Ghafari, M. and Kruk, R. and Ellrich, J. and Hütten, A. and Schmitt, L. A. and Hahn, H.
Title: Interfacial microstructure of Fe∕AlO[sub x]∕Fe magnetic tunnel junctions in high resolution
Language: English
Abstract:

Magnetic tunnel junctions were prepared by deposition of a Ta-buffered Fe-AlOx-Fe trilayer on a thermally oxidized silicon wafer. In order to investigate the influence of different Fe oxides like a spinel-like phase and a spinel (Hycernite) on the tunneling magnetoresistance effect, a 57Fe tracer was deposited at the lower barrier interface. Using conversion electron Mössbauer spectroscopy the evolution of chemical, structural, and magnetic changes in the tracer was monitored starting from the as-prepared state and after several annealing steps. The nuclear probe technique enables to resolve phase formation at the interface with submonolayer resolution.

Journal or Publication Title: Applied Physics Letters
Volume: 88
Number: 12
Publisher: American Institute of Physics
Uncontrolled Keywords: iron, tantalum, aluminium compounds, magnetic multilayers, tunnelling magnetoresistance, Mossbauer spectroscopy, annealing, interface structure, conversion electron spectra
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Feb 2013 09:33
Official URL: http://dx.doi.org/10.1063/1.2186991
Identification Number: doi:10.1063/1.2186991
Funders: This work was funded by the Deutsche Forschungsgemeinschaft (�DFG). �.
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