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

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

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.

Item Type: Article
Erschienen: 2004
Creators: Öksüzoglu, Ramis M. and Elmali, Ayhan and Henn, R. and Fuess, Hartmut and Hahn, Horst
Title: Structural and magnetic properties of Al doped Co-Ag granular films : temperature dependence of magnetoresistance
Language: English
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.

Journal or Publication Title: Journal of magnetism and magnetic materials
Journal volume: 279
Number: 2-3
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Magnetoresistance, Magnetic properties of heterostructures, Structural properties, Sputtering
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
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Date Deposited: 20 Nov 2008 08:19
License: [undefiniert]
Funders: Financial support from the Fonds Deutschen Chemischen Industrie is gratefully acknowledged.
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