Shell-driven magnetic stability in core-shell nanoparticles
Nogués, Josep (Universitat Autònoma de Barcelona. Departament de Física)
Skumryev, Vassil (Institució Catalana de Recerca i Estudis Avançats)
Sort Viñas, Jordi (Institució Catalana de Recerca i Estudis Avançats)
Stoyanov, S. (University of Delaware. Department of Physics and Astronomy)
Givord, D. (Centre National de la Recherche Scientifique (França))
American Physical Society

Date:	2006
Abstract:	The magnetic properties of ferromagnetic-antiferromagnetic Co-CoO core-shell nanoparticles are investigated as a function of the in-plane coverage density from 3. 5% to 15%. The superparamagnetic blocking temperature, the coercivity, and the bias field radically increase with increasing coverage. This behavior cannot be attributed to the overall interactions between cores. Rather, it can be semiquantitatively understood by assuming that the shells of isolated core-shell nanoparticles have strongly degraded magnetic properties, which are rapidly recovered as nanoparticles come into contact.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; Versió publicada
Published in:	Physical review letters, Vol. 97, Num. 15 (October 2006) , p. 157203, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.97.157203

4 p, 263.2 KB

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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)
Articles > Published articles