Bulk and interfacial effects in Co-Cr 2O 3 nanocomposites

M. Farooq Nasir; Huey Hoon Hng; K. O'Grady; Sadia Manzoor

doi:10.1166/jnn.2011.2732

Bulk and interfacial effects in Co-Cr ₂O ₃ nanocomposites

M. Farooq Nasir^*, Huey Hoon Hng, K. O'Grady, Sadia Manzoor

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

The exchange bias field has been measured in a set of Co-Cr ₂O ₃ nanocomposites in order to distinguish between the bulk and interfacial contributions to H _ex. The studies were carried out on a set of samples prepared by the sol gel technique in which the Co concentration was varied between 30 and 80 wt%. The particle sizes in all samples were carefully controlled so as to enable a compari-son of their magnetic properties. Using thermal activation measurements we are able to distinguish between contributions to H _ex arising from the thermal stability of the antiferromagnetic particles (bulk behaviour) and that due to changing interface density with increasing Co concentration. We have interpreted our results in terms of the independent particle volume model.

Original language	English
Pages (from-to)	2700-2703
Number of pages	4
Journal	Journal of Nanoscience and Nanotechnology
Volume	11
Issue number	3
DOIs	https://doi.org/10.1166/jnn.2011.2732
Publication status	Published - Mar 2011
Externally published	Yes

ASJC Scopus Subject Areas

Bioengineering
General Chemistry
Biomedical Engineering
General Materials Science
Condensed Matter Physics

Keywords

Exchange bias
Magnetic nanocomposites

Access to Document

10.1166/jnn.2011.2732

Cite this

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abstract = "The exchange bias field has been measured in a set of Co-Cr 2O 3 nanocomposites in order to distinguish between the bulk and interfacial contributions to H ex. The studies were carried out on a set of samples prepared by the sol gel technique in which the Co concentration was varied between 30 and 80 wt%. The particle sizes in all samples were carefully controlled so as to enable a compari-son of their magnetic properties. Using thermal activation measurements we are able to distinguish between contributions to H ex arising from the thermal stability of the antiferromagnetic particles (bulk behaviour) and that due to changing interface density with increasing Co concentration. We have interpreted our results in terms of the independent particle volume model.",

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AB - The exchange bias field has been measured in a set of Co-Cr 2O 3 nanocomposites in order to distinguish between the bulk and interfacial contributions to H ex. The studies were carried out on a set of samples prepared by the sol gel technique in which the Co concentration was varied between 30 and 80 wt%. The particle sizes in all samples were carefully controlled so as to enable a compari-son of their magnetic properties. Using thermal activation measurements we are able to distinguish between contributions to H ex arising from the thermal stability of the antiferromagnetic particles (bulk behaviour) and that due to changing interface density with increasing Co concentration. We have interpreted our results in terms of the independent particle volume model.

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