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Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness

Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness

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ATXITIA MACIZO, Unai, Denise HINZKE, Oksana CHUBYKALO-FESENKO, Ulrich NOWAK, Hamid KACHKACHI, Oleg N. MRYASOV, Richard Francis L. EVANS, Roy W. CHANTRELL, 2010. Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness. In: Physical Review B. 82(13), 134440. ISSN 1098-0121. eISSN 1550-235X

@article{Atxitia Macizo2010Multi-943, title={Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness}, year={2010}, doi={10.1103/PhysRevB.82.134440}, number={13}, volume={82}, issn={1098-0121}, journal={Physical Review B}, author={Atxitia Macizo, Unai and Hinzke, Denise and Chubykalo-Fesenko, Oksana and Nowak, Ulrich and Kachkachi, Hamid and Mryasov, Oleg N. and Evans, Richard Francis L. and Chantrell, Roy W.}, note={Article Number: 134440} }

<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/123456789/943"> <dc:contributor>Hinzke, Denise</dc:contributor> <dc:language>eng</dc:language> <dc:contributor>Atxitia Macizo, Unai</dc:contributor> <dc:contributor>Mryasov, Oleg N.</dc:contributor> <dc:creator>Hinzke, Denise</dc:creator> <dc:contributor>Chubykalo-Fesenko, Oksana</dc:contributor> <dc:contributor>Chantrell, Roy W.</dc:contributor> <dc:creator>Nowak, Ulrich</dc:creator> <dcterms:title>Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness</dcterms:title> <dcterms:abstract xml:lang="eng">For finite-temperature micromagnetic simulations the knowledge of the temperature dependence of the exchange stiffness plays a central role. We use two approaches for the calculation of the thermodynamic exchange parameter from spin models: (i) based on the domain-wall energy and (ii) based on the spin-wave dispersion. The corresponding analytical and numerical approaches are introduced and compared. A general theory for the temperature dependence and scaling of the exchange stiffness is developed using the classical spectral density method. The low-temperature exchange stiffness A is found to scale with magnetization as m1.66 for systems on a simple cubic lattice and as m1.76 for an FePt Hamiltonian parametrized through ab initio calculations. The additional reduction in the scaling exponent, as compared to the mean-field theory (A~ m2), comes from the nonlinear spin-wave effects.</dcterms:abstract> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/943"/> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103416863-3868037-7"/> <dc:creator>Chubykalo-Fesenko, Oksana</dc:creator> <dc:creator>Atxitia Macizo, Unai</dc:creator> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-22T17:52:23Z</dcterms:available> <dc:contributor>Evans, Richard Francis L.</dc:contributor> <dc:contributor>Kachkachi, Hamid</dc:contributor> <dcterms:bibliographicCitation>Publ. in: Physical Review B 82 (2010), 13, 134440</dcterms:bibliographicCitation> <dc:creator>Evans, Richard Francis L.</dc:creator> <dc:creator>Chantrell, Roy W.</dc:creator> <dcterms:issued>2010</dcterms:issued> <dc:creator>Kachkachi, Hamid</dc:creator> <dc:rights>deposit-license</dc:rights> <dc:creator>Mryasov, Oleg N.</dc:creator> <dc:contributor>Nowak, Ulrich</dc:contributor> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-22T17:52:23Z</dc:date> </rdf:Description> </rdf:RDF>

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