Correlating material-specific layers and magnetic distributions within onion-like Fe 3 O 4 /MnO/ γ- Mn2 O3 core/shell nanoparticles
Krycka, K. L. (NIST Center for Neutron Research)
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física)
Borchers, J. A. (NIST Center for Neutron Research)
Laver, M. (Paul Scherrer Institut (Suïssa))
Salazar Álvarez, Germán (Stockholms universitet. Department of Materials and Environmental Chemistry)
López-Ortega, Alberto (Institut Català de Nanociència i Nanotecnologia)
Estrader, Marta (Stockholms universitet. Department of Materials and Environmental Chemistry)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)

Date:	2013
Abstract:	The magnetic responses of two nanoparticle systems comprised of Fe3 O 4/γ−Mn2O3 (soft ferrimagnetic, FM/hard FM) and Fe3O4/MnO/γ−Mn2 O3 (soft FM / antiferromagnetic, AFM/hard FM) are compared, where the MnO serves to physically decouple the FM layers. Variation in the temperature and applied field allows for Small Angle Neutron Scattering (SANS) measurements of the magnetic moments both parallel and perpendicular to an applied field. Data for the bilayer particle indicate that the graded ferrimagnetic layers are coupled and respond to the field as a single unit. For the trilayer nanoparticles, magnetometry suggests a Curie temperature (TC)≈ 40 K for the outer γ−Mn2O3 component, yet SANS reveals an increase in the magnetization associated with outer layer that is perpendicular to the applied field above TC during magnetic reversal. This result suggests that the γ−Mn2O3 magnetically reorients relative to the applied field as the temperature is increased above 40 K.
Grants:	Ministerio de Economía y Competitividad MAT2010-20616-C02 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1292
Note:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Materials ; Propietats magnètiques ; Nanopartícules
Published in:	Journal of applied physics, Vol. 113, Núm. 17 (May 2013) , p. B531-B533, ISSN 1089-7550

DOI: 10.1063/1.4801423

3 p, 1.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
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