| Collective behaviour in two-dimensional cobalt nanoparticle assemblies observed by magnetic force microscopy. | |
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MedLine Citation:
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PMID: 15048109 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The use of magnetic nanoparticles in the development of ultra-high-density recording media is the subject of intense research. Much of the attention of this research is devoted to the stability of magnetic moments, often neglecting the influence of dipolar interactions. Here, we explore the magnetic microstructure of different assemblies of monodisperse cobalt single-domain nanoparticles by magnetic force microscopy and magnetometric measurements. We observe that when the density of particles per unit area is higher than a determined threshold, the two-dimensional self-assemblies behave as a continuous ferromagnetic thin film. Correlated areas (similar to domains) of parallel magnetization roughly ten particles in diameter appear. As this magnetic percolation is mediated by dipolar interactions, the magnetic microstructure, its distribution and stability, is strongly dependent on the topological distribution of the dipoles. Thus, the magnetic structures of three-dimensional assemblies are magnetically soft, and an evolution of the magnetic microstructure is observed with consecutive scans of the microscope tip. |
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Authors:
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Victor F Puntes; Pau Gorostiza; Deborah M Aruguete; Neus G Bastus; A Paul Alivisatos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. Date: 2004-03-28 |
Journal Detail:
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Title: Nature materials Volume: 3 ISSN: 1476-1122 ISO Abbreviation: Nat Mater Publication Date: 2004 Apr |
Date Detail:
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Created Date: 2004-04-01 Completed Date: 2004-05-25 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 101155473 Medline TA: Nat Mater Country: England |
Other Details:
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Languages: eng Pagination: 263-8 Citation Subset: IM |
Affiliation:
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Physics Department, University of Barcelona, 08028 Barcelona, Spain. vfpuentes@ffn.ub.es |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anisotropy Cobalt / chemistry* Image Processing, Computer-Assisted Magnetics* Microscopy, Atomic Force / instrumentation*, methods* Nanotechnology / methods* Software |
| Grant Support | |
ID/Acronym/Agency:
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1 R01 RR-14891-01/RR/NCRR NIH HHS |
| Chemical | |
Reg. No./Substance:
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7440-48-4/Cobalt |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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