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Magnetic properties of iron cluster/chromium matrix nanocomposites

Fischer, Arne and Kruk, Robert and Wang, Di and Hahn, Horst (2015):
Magnetic properties of iron cluster/chromium matrix nanocomposites.
6, In: Beilstein Journal of Nanotechnology, Beilstein-Institut, pp. 1158-1163, ISSN 2190-4286, [Online-Edition: http://dx.doi.org/10.3762/bjnano.6.117],
[Article]

Abstract

A custom-designed apparatus was used for the fine-tuned co-deposition of preformed Fe clusters into antiferromagnetic Cr matrices. Three series of samples with precisely defined cluster sizes, with accuracy to a few atoms, and controlled concentrations were fabricated, followed by a complete characterization of structure and magnetic performance. Relevant magnetic characteristics, reflecting the ferromagnetic/antiferromagnetic coupling between Fe clusters and the Cr matrix, i.e., blocking temperature, coercivity field, and exchange bias were measured and their dependence on cluster size and cluster concentration in the matrix was analyzed. It is evident that the blocking temperatures are clearly affected by both the cluster size and their concentration in the Cr matrix. In contrast the coercivity shows hardly any dependence on size or inter-cluster distance. The exchange bias was found to be strongly sensitive to the cluster size but not to the inter-cluster distances. Therefore, it was concluded to be an effect that is purely localized at the interfaces.

Item Type: Article
Erschienen: 2015
Creators: Fischer, Arne and Kruk, Robert and Wang, Di and Hahn, Horst
Title: Magnetic properties of iron cluster/chromium matrix nanocomposites
Language: English
Abstract:

A custom-designed apparatus was used for the fine-tuned co-deposition of preformed Fe clusters into antiferromagnetic Cr matrices. Three series of samples with precisely defined cluster sizes, with accuracy to a few atoms, and controlled concentrations were fabricated, followed by a complete characterization of structure and magnetic performance. Relevant magnetic characteristics, reflecting the ferromagnetic/antiferromagnetic coupling between Fe clusters and the Cr matrix, i.e., blocking temperature, coercivity field, and exchange bias were measured and their dependence on cluster size and cluster concentration in the matrix was analyzed. It is evident that the blocking temperatures are clearly affected by both the cluster size and their concentration in the Cr matrix. In contrast the coercivity shows hardly any dependence on size or inter-cluster distance. The exchange bias was found to be strongly sensitive to the cluster size but not to the inter-cluster distances. Therefore, it was concluded to be an effect that is purely localized at the interfaces.

Journal or Publication Title: Beilstein Journal of Nanotechnology
Volume: 6
Publisher: Beilstein-Institut
Uncontrolled Keywords: cluster, cluster deposition, exchange bias, matrix
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Feb 2016 09:12
Official URL: http://dx.doi.org/10.3762/bjnano.6.117
Identification Number: doi:10.3762/bjnano.6.117
Funders: The authors are grateful for a generous equipment grant for the cluster deposition system from the federal state of Hessen (Germany).
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