Rafaja, David ; Ebert, Jörg ; Miehe, Gerhard ; Martz, Nathalie ; Knapp, Michael ; Stahl, Branko ; Ghafari, Mohammad ; Hahn, Horst ; Fuess, Hartmut ; Schmollngruber, Peter ; Farber, Paul ; Siegle, Henrik (2004)
Changes in the real structure and magnetoresistance of Co90Fe10/Cu and Co90Fe10/Cu85Ag10Au5 multilayers after annealing.
In: Thin Solid Films, 460 (1-2)
doi: 10.1016/j.tsf.2004.01.099
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Annealing of the (1.1 nm Co90Fe10/2.2 nm Cu)×20 and (1.1 nm Co90Fe10/2.2 nm Cu85Ag10Au5)×20 multilayers at 235 °C improved their magnetoresistance as compared to the virgin samples. Annealing at higher temperatures resulted in degradation of the magnetoresistance effect. This observation raised the motivation of a detailed structural study using small-angle X-ray scattering, wide-angle X-ray diffraction, electron diffraction and transmission electron microscopy with the aim to link the structural changes in the system to the changes in the magnetoresistance. The structure studies have shown that the maximum of the magnetoresistance observed after annealing at 235 °C is related to the separation of Co90Fe10 and Cu, which are partly intermixed at interfaces after the deposition process. The decay of the GMR effect at higher annealing temperatures is caused by an increase of the interface roughness, which led in the Co90Fe10/Cu multilayers to occurrence of non-continuous interfaces and to short-circuiting of magnetic layers. In the Cu85Ag10Au5 multilayers, the combination of small-angle X-ray scattering and wide-angle X-ray diffraction has shown that Cu85Ag10Au5 did not form an alloy with the nominal composition: Only a part of Au and Ag was dissolved in the copper structure; the remainder of Ag and Au formed precipitates.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2004 |
| Autor(en): | Rafaja, David ; Ebert, Jörg ; Miehe, Gerhard ; Martz, Nathalie ; Knapp, Michael ; Stahl, Branko ; Ghafari, Mohammad ; Hahn, Horst ; Fuess, Hartmut ; Schmollngruber, Peter ; Farber, Paul ; Siegle, Henrik |
| Art des Eintrags: | Bibliographie |
| Titel: | Changes in the real structure and magnetoresistance of Co90Fe10/Cu and Co90Fe10/Cu85Ag10Au5 multilayers after annealing |
| Sprache: | Englisch |
| Publikationsjahr: | 22 Juli 2004 |
| Verlag: | Elsevier Science Publishing Company |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Thin Solid Films |
| Jahrgang/Volume einer Zeitschrift: | 460 |
| (Heft-)Nummer: | 1-2 |
| DOI: | 10.1016/j.tsf.2004.01.099 |
| Kurzbeschreibung (Abstract): | Annealing of the (1.1 nm Co90Fe10/2.2 nm Cu)×20 and (1.1 nm Co90Fe10/2.2 nm Cu85Ag10Au5)×20 multilayers at 235 °C improved their magnetoresistance as compared to the virgin samples. Annealing at higher temperatures resulted in degradation of the magnetoresistance effect. This observation raised the motivation of a detailed structural study using small-angle X-ray scattering, wide-angle X-ray diffraction, electron diffraction and transmission electron microscopy with the aim to link the structural changes in the system to the changes in the magnetoresistance. The structure studies have shown that the maximum of the magnetoresistance observed after annealing at 235 °C is related to the separation of Co90Fe10 and Cu, which are partly intermixed at interfaces after the deposition process. The decay of the GMR effect at higher annealing temperatures is caused by an increase of the interface roughness, which led in the Co90Fe10/Cu multilayers to occurrence of non-continuous interfaces and to short-circuiting of magnetic layers. In the Cu85Ag10Au5 multilayers, the combination of small-angle X-ray scattering and wide-angle X-ray diffraction has shown that Cu85Ag10Au5 did not form an alloy with the nominal composition: Only a part of Au and Ag was dissolved in the copper structure; the remainder of Ag and Au formed precipitates. |
| Freie Schlagworte: | Co/Cu-multilayers, Real structure, Small-angle X-ray scattering, X-Ray diffraction, Transmission electron microscopy |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 08 Feb 2013 08:34 |
| Letzte Änderung: | 05 Mär 2013 10:05 |
| PPN: | |
| Sponsoren: | D.R. appreciates the support of his work through the Alexander von Humboldt Foundation., J.E. acknowledges the support via the German BMBF as a part of the Robert Bosch GmbH research project on magnetoelectronics., SAXS measurements done at HASYLAB/DESY (Hamburg) were supported from the BMBF project # 05 KS1RDA/9. |
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