AC susceptibility as a tool to probe the dipolar interaction in magnetic nanoparticles

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dc.creatorLandi, Gabriel Teixeira
dc.creatorArantes, Fabiana Rodrigues
dc.creatorReinaldo Cornejo, Daniel
dc.creatorBakuzis, Andris Figueiroa
dc.creatorAndreu, Irene
dc.creatorNatividad, Eva
dc.date.accessioned2023-11-21T15:00:49Z
dc.date.available2023-11-21T15:00:49Z
dc.date.issued2017
dc.description.abstractThe dipolar interaction is known to substantially affect the properties of magnetic nanoparticles. This is particularly important when the particles are kept in a fluid suspension or packed within nano-carriers. In addition to its usual long-range nature, in these cases the dipolar interaction may also induce the formation of clusters of particles, thereby strongly modifying their magnetic anisotropies. In this paper we show how AC susceptibility may be used to obtain information regarding the influence of the dipolar interaction in a sample. We develop a model which includes both aspects of the dipolar interaction and may be fitted directly to the susceptibility data. The usual long-range nature of the interaction is implemented using a mean-field approximation, whereas the particle-particle aggregation is modeled using a distribution of anisotropy constants. The model is then applied to two samples studied at different concentrations. One consists of spherical magnetite nanoparticles dispersed in oil and the other of cubic magnetite nanoparticles embedded on polymeric nanospheres. We also introduce a simple technique to address the presence of the dipolar interaction in a given sample, based on the height of the AC susceptibility peaks for different driving frequencies.
dc.identifier.citationLANDI, Gabriel T. et al. AC susceptibility as a tool to probe the dipolar interaction in magnetic nanoparticles. Journal of Magnetism and Magnetic Materials, Amsterdam, v. 421, p. 138-151, 2017. DOI: 10.1016/j.jmmm.2016.08.011. Disponível em: https://www.sciencedirect.com/science/article/pii/S0304885316316559. Acesso em: 12 set. 2023.
dc.identifier.doi10.1016/j.jmmm.2016.08.011
dc.identifier.issn0304-8853
dc.identifier.issne- 1873-4766
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0304885316316559
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectAC susceptibility
dc.subjectMagnetic hyperthermia
dc.subjectMagnetic nanoparticles
dc.titleAC susceptibility as a tool to probe the dipolar interaction in magnetic nanoparticles
dc.typeArtigo

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