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Article Dans Une Revue IEEE Magnetics Letters Année : 2020

Evidence of the Superparamagnetic State in the Zero-Field Microwave Susceptibility Spectra of Ferrimagnetic Nanoparticles

Résumé

Static and dynamic magnetic properties of Zn0.4Fe2.6O4 nanoparticles synthesized by thermal decomposition have been investigated. Two ranges of diameter have been used: small particles (diameter about 6.2 nm) and larger ones (diameter about 22.4 nm). The nanoparticle microstructure has been characterized by transmission electron microscopy. The temperature dependence of the zero-field dynamic permeability for both nanoparticle sizes has been studied, revealing a superparamagnetic state for the small ones. Effects of the nanoparticle size on the dynamic permeability have been studied, and linked to the superparamagnetic state. A dynamic susceptibility model has been found to reproduce the experimental behavior as well as its temperature dependence.
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hal-03008885 , version 1 (08-12-2020)

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Marie Darcheville, Anne-Lise Adenot-Engelvin, Christophe Boscher, Nicolas Vukadinovic, Christophe Lefèvre, et al.. Evidence of the Superparamagnetic State in the Zero-Field Microwave Susceptibility Spectra of Ferrimagnetic Nanoparticles. IEEE Magnetics Letters, 2020, 11, pp.1-5. ⟨10.1109/LMAG.2020.3026228⟩. ⟨hal-03008885⟩
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