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| Titel |
Including Magnetostriction in Micromagnetic Models |
| VerfasserIn |
Pádraig Ó Conbhuí, Wyn Williams, Karl Fabian, Lesleis Nagy |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127834
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| Publikation (Nr.) |
 EGU/EGU2016-7754.pdf |
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| Zusammenfassung |
| The magnetic anomalies that identify crustal spreading are predominantly recorded by
basalts formed at the mid-ocean ridges, whose magnetic signals are dominated by
iron–titanium-oxides (Fe3−xTixO4), so called “titanomagnetites”, of which the
Fe2.4Ti0.6O4 (TM60) phase is the most common. With sufficient quantities of titanium
present, these minerals exhibit strong magnetostriction. To date, models of these grains in the
pseudo-single domain (PSD) range have failed to accurately account for this effect. In
particular, a popular analytic treatment provided by Kittel (1949) for describing the
magnetostrictive energy as an effective increase of the anisotropy constant can
produce unphysical strains for non-uniform magnetizations. I will present a rigorous
approach based on work by Brown (1966) and by Kroner (1958) for including
magnetostriction in micromagnetic codes which is suitable for modelling hysteresis loops
and finding remanent states in the PSD regime. Preliminary results suggest the
more rigorously defined micromagnetic models exhibit higher coercivities and
extended single domain ranges when compared to more simplistic approaches. |
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