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The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles

The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles

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EVANS, Richard, Ulrich NOWAK, Florian DORFBAUER, Thomas SCHREFL, Oleg MRYASOV, Roy W. CHANTRELL, Gregory GROCHOLA, 2006. The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles. In: Journal of Applied Physics. 99, 08G703

@article{Evans2006influ-9212, title={The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles}, year={2006}, doi={10.1063/1.2167636}, volume={99}, journal={Journal of Applied Physics}, author={Evans, Richard and Nowak, Ulrich and Dorfbauer, Florian and Schrefl, Thomas and Mryasov, Oleg and Chantrell, Roy W. and Grochola, Gregory}, note={Article Number: 08G703} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/9212"> <dc:creator>Evans, Richard</dc:creator> <dc:language>eng</dc:language> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:54:36Z</dc:date> <dc:creator>Mryasov, Oleg</dc:creator> <dc:contributor>Nowak, Ulrich</dc:contributor> <dc:creator>Grochola, Gregory</dc:creator> <dc:contributor>Mryasov, Oleg</dc:contributor> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/9212"/> <dcterms:issued>2006</dcterms:issued> <dc:creator>Chantrell, Roy W.</dc:creator> <dcterms:title>The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles</dcterms:title> <dc:creator>Dorfbauer, Florian</dc:creator> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103416863-3868037-7"/> <dc:contributor>Grochola, Gregory</dc:contributor> <dc:rights>deposit-license</dc:rights> <dc:contributor>Chantrell, Roy W.</dc:contributor> <dc:creator>Nowak, Ulrich</dc:creator> <dcterms:abstract xml:lang="eng">We have investigated the effect of lattice fluctuations on the magnetic properties of nanoparticles of Fe and Co. Atomic structures were simulated using a molecular-dynamic approach, with the system slowly cooled into the ordered phase. The magnetic properties were then simulated using an atomistic approach using a classical spin Hamiltonian taking into account the long-range nature and atomic separation dependence of the exchange. The magnetic properties are found to be affected by both the particle shape and the lattice fluctuations. For a perfectly ordered lattice we find that a spherical particle has a larger magnetization for a given temperature than a cube containing the same number of atoms. We have also studied the effect of lattice fluctuations. This involves a comparison of M(T)or two cases, firstly, a nanoparticle with a fixed lattice corresponding to the low-temperature annealed state (T=20 K), and secondly a nanoparticle with a lattice structure equilibrated at the temperature T, the latter case being subject to fluctuations in the lattice spacing, and the nanoparticle shape. The dynamic structure gives rise to a reduction in the magnetization and Tc, which is a finite size effect to be considered beyond others such as the reduction in coordination at the nanoparticle surface.</dcterms:abstract> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:54:36Z</dcterms:available> <dc:format>application/pdf</dc:format> <dc:contributor>Evans, Richard</dc:contributor> <dc:creator>Schrefl, Thomas</dc:creator> <dc:contributor>Dorfbauer, Florian</dc:contributor> <dcterms:bibliographicCitation>First publ. in: Journal of Applied Physics 99 (2006), 08G703</dcterms:bibliographicCitation> <dc:contributor>Schrefl, Thomas</dc:contributor> </rdf:Description> </rdf:RDF>

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