Effective magnetic moment of magnetic multicore nanoparticles
Artikel i vetenskaplig tidskrift, 2009

We carry out Monte Carlo simulations to study the effective magnetic moment mu(eff) in the low-field region of magnetic multicore nanoparticles. Transmission electron microscopy and scanning electron microscopy images show that these particles contain a number of magnetic nanocrystals (MNCs) randomly packed in a single cluster of total volume V(tot). We illustrate how the initial magnetic susceptibility chi(0) of magnetic multicore nanoparticles can be straightforward derived from mu(eff) computed at zero magnetic field. We observe that dipolar interactions between MNCs and polydispersity of the MNCs contribute to increase and to decrease mu(eff)/V(tot), respectively, while magnetic anisotropy of the MNCs does not show any effect. In all three cases, mu(eff)/V(tot) can be described by a linear relation to (mu B/k(B)T)(2) that we analytically derived for low applied fields.

magnetic anisotropy

exchange interactions (electron)

Monte Carlo methods


transmission electron microscopy

magnetic moments

magnetic susceptibility

scanning electron microscopy


Vincent Schaller

Chalmers, Teknisk fysik, Elektronikmaterial

Göran Wahnström

Chalmers, Teknisk fysik, Material- och ytteori

Anke Sanz-Velasco

Chalmers, Teknisk fysik, Elektronikmaterial

Stefan Gustafsson

SuMo Biomaterials

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Eva Olsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Peter Enoksson

Chalmers, Teknisk fysik, Elektronikmaterial

Christer Johansson

Physical Review B - Condensed Matter and Materials Physics

24699950 (ISSN) 24699969 (eISSN)

Vol. 80 9 092406-


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