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Colossal Anisotropy of the Dynamic Magnetic Susceptibility in Low-Dimensional Nanocube Assemblies.
Uppsala University, Sweden.
RISE - Research Institutes of Sweden, ICT, Acreo.
Cornell University, Sweden.
Chalmers industripark, Sweden.
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2018 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086XArticle in journal (Refereed) In press
Abstract [en]

nanocubes display a significant augmentation of the magnetic susceptibility and dissipation as compared to 0D and 2D systems. The performance of the nanocube needles is highlighted by a colossal anisotropy factor defined as the ratio of the parallel to the perpendicular magnetization components. We show that the origin of this effect cannot be ascribed to shape anisotropy in its classical sense; as such, it has no analogy in bulk magnetic materials. The temperature-dependent anisotropy factors of the in- and out-of-phase components of the magnetization have an extremely strong particle size dependence and reach values of 80 and 2500, respectively, for the largest nanocubes in this study. Aided by simulations, we ascribe the anisotropy of the magnetic susceptibility, and its strong particle-size dependence to a synergistic coupling between the dipolar interaction field and a net anisotropy field resulting from a partial texture in the 1D nanocube needles.

Place, publisher, year, edition, pages
2018.
Keyword [en]
ac-susceptibility, anisotropy, arrays, assemblies, magnetic nanoparticles, magnetic properties, supercrystals
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33343DOI: 10.1021/acsnano.7b07745PubMedID: 29328678OAI: oai:DiVA.org:ri-33343DiVA, id: diva2:1186611
Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-03-16Bibliographically approved

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