Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
Varón Izquierdo, Miriam (Institut Català de Nanociència i Nanotecnologia)
Beleggia, Marco (Danmarks tekniske universitet. Center for Elektronnanoskopi)
Jordanovic, Jelena (Technical University of Denmark, Institut fur Fysik)
Schiøtz, Jakob (Technical University of Denmark, Institut fur Fysik)
Kasama, Takeshi (Danmarks tekniske universitet. Center for Elektronnanoskopi)
Puntes, Víctor (Institut Català de Nanociència i Nanotecnologia)
Frandsen, Cathrine (Technical University of Denmark, Institut fur Fysik)

Date:	2015
Abstract:	Through evaporation of dense colloids of ferromagnetic ∼13nm Ɛ-Co particles onto carbon substrates, anisotropic magnetic dipolar interactions can support formation of elongated particle structures with aggregate thicknesses of 100-400â €‰nm and lengths of up to some hundred microns. Lorenz microscopy and electron holography reveal collective magnetic ordering in these structures. However, in contrast to continuous ferromagnetic thin films of comparable dimensions, domain walls appear preferentially as longitudinal, i. e. , oriented parallel to the long axis of the nanoparticle assemblies. We explain this unusual domain structure as the result of dipolar interactions and shape anisotropy, in the absence of inter-particle exchange coupling.
Grants:	Ministerio de Ciencia e Innovación BES-2007-17164
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Magnetic devices ; Magnetic properties and materials
Published in:	Scientific reports, Vol. 5 (2015) , art. 14536, ISSN 2045-2322

DOI: 10.1038/srep14536
PMID: 26416297

7 p, 1.8 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles