Effective magnetic moment of magnetic multicore nanoparticles
Journal article, 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

nanoparticles

transmission electron microscopy

magnetic moments

magnetic susceptibility

scanning electron microscopy

Author

Vincent Schaller

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Göran Wahnström

Chalmers, Applied Physics, Materials and Surface Theory

Anke Sanz-Velasco

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Stefan Gustafsson

SuMo Biomaterials

Chalmers, Applied Physics, Microscopy and Microanalysis

Eva Olsson

Chalmers, Applied Physics, Microscopy and Microanalysis

Peter Enoksson

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Christer Johansson

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 80 9 092406-

Subject Categories

Other Physics Topics

Condensed Matter Physics

Areas of Advance

Materials Science

DOI

10.1103/PhysRevB.80.092406

More information

Latest update

8/18/2020