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Exchange bias effects in Fe nanoparticles embedded in an antiferromagnetic Cr2O3 matrix

Sort, Jordi and Langlais, Véronique and Doppiu, Stefania and Dieny, Bernard and Suriñach, Santiago and Muñoz, Juan Santiago and Baró, Maria Dolors and Laurent, Christophe and Nogués, Josep Exchange bias effects in Fe nanoparticles embedded in an antiferromagnetic Cr2O3 matrix. (2004) Nanotechnology, 15 (4). S211-S214. ISSN 0957-4484

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Official URL: http://dx.doi.org/10.1088/0957-4484/15/4/017

Abstract

Powders consisting of ferromagnetic (FM) Fe nanoparticles, of about 7 nm in size, embedded in an antiferromagnetic (AFM) Cr2O3 matrix have been obtained by high-temperature reduction under a hydrogen atmosphere of a mixed Cr–Fe oxide. This FM–AFM system exhibits exchange bias effects, i.e. a loop shift (HE) and coercivity enhancement (ΔHC), when field-cooled through the N´eel temperature, TN, of Cr2O3. The exchange bias properties were measured as a function of temperature. HE and ΔHC are found to vanish at about TN(Cr2O3), indicating a good quality AFM matrix. Hence, high-temperature reduction of mixed oxides is demonstrated to be a suitable technique to develop new types of FM–AFM exchange-biased nanoparticles, from which novel applications of this phenomenon may be developed.

Item Type:Article
Additional Information:Thanks to IOP Publishing. The definitive version is available at http://iopscience.iop.org/0957-4484/15/4/017/
HAL Id:hal-00915670
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Institució Catalana de Recerca i Estudis Avançats - ICREA (SPAIN)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universitat Autònoma de Barcelona - UAB (SPAIN)
Other partners > Université Joseph Fourier Grenoble 1 - UJF (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:09 Dec 2013 10:14

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