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Structural and magnetic properties of Al doped Co-Ag granular films : temperature dependence of magnetoresistance

Öksüzoglu, Ramis M. ; Elmali, Ayhan ; Henn, R. ; Fuess, Hartmut ; Hahn, Horst :
Structural and magnetic properties of Al doped Co-Ag granular films : temperature dependence of magnetoresistance.
In: Journal of magnetism and magnetic materials, 279 (2-3) pp. 202-209. ISSN 0304-8853
[Artikel], (2004)

Kurzbeschreibung (Abstract)

The correlation between the structure, the magnetic and magnetotransport properties of sputter-deposited (Co90Al10)xAg100−x granular films (19⩽x⩽45) are investigated. For an (Co90Al10) content of about 28% the magnetoresistance (MR) ratio of the films reach its highest value of 6%. Al doping reduces the MR ratio in CoAg films, however, leads to a almost constant MR ratio against post annealing up to 773 K in (Co90Al10)28Ag72 granular films, although the film structure is affected by annealing, respectively. According to magnetization measurements, superparamagnetic cobalt grains in the as-deposited (Co90Al10)28Ag72 sample show after annealing up to 773 K both superparamagnetic and ferromagnetic behaviour. Annealing at 823 K causes a domain formation of large ferromagnetic grains with strong correlation.

Typ des Eintrags: Artikel
Erschienen: 2004
Autor(en): Öksüzoglu, Ramis M. ; Elmali, Ayhan ; Henn, R. ; Fuess, Hartmut ; Hahn, Horst
Titel: Structural and magnetic properties of Al doped Co-Ag granular films : temperature dependence of magnetoresistance
Sprache: Englisch
Kurzbeschreibung (Abstract):

The correlation between the structure, the magnetic and magnetotransport properties of sputter-deposited (Co90Al10)xAg100−x granular films (19⩽x⩽45) are investigated. For an (Co90Al10) content of about 28% the magnetoresistance (MR) ratio of the films reach its highest value of 6%. Al doping reduces the MR ratio in CoAg films, however, leads to a almost constant MR ratio against post annealing up to 773 K in (Co90Al10)28Ag72 granular films, although the film structure is affected by annealing, respectively. According to magnetization measurements, superparamagnetic cobalt grains in the as-deposited (Co90Al10)28Ag72 sample show after annealing up to 773 K both superparamagnetic and ferromagnetic behaviour. Annealing at 823 K causes a domain formation of large ferromagnetic grains with strong correlation.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of magnetism and magnetic materials
Band: 279
(Heft-)Nummer: 2-3
Verlag: Elsevier Science Publishing Company
Freie Schlagworte: Magnetoresistance, Magnetic properties of heterostructures, Structural properties, Sputtering
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Gemeinschaftslabor Nanomaterialien
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Strukturforschung
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 20 Nov 2008 08:19
Sponsoren: Financial support from the Fonds Deutschen Chemischen Industrie is gratefully acknowledged.
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