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Monte Carlo simulation of magnetic multi-core nanoparticles |
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| Authors: | Vincent Schaller Göran Wahnström Peter Enoksson |
| Institution: | a Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96 Göteborg, Sweden b Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden c Imego Institute, Arvid Hedvalls Backe 4, Box 53071, SE-400 14 Göteborg, Sweden |
| Abstract: | In this paper, a Monte Carlo simulation is carried out to evaluate the equilibrium magnetization of magnetic multi-core nanoparticles in a liquid and subjected to a static magnetic field. The particles contain a magnetic multi-core consisting of a cluster of magnetic single-domains of magnetite. We show that the magnetization of multi-core nanoparticles cannot be fully described by a Langevin model. Inter-domain dipolar interactions and domain magnetic anisotropy contribute to decrease the magnetization of the particles, whereas the single-domain size distribution yields an increase in magnetization. Also, we show that the interactions affect the effective magnetic moment of the multi-core nanoparticles. |
| Keywords: | Magnetic multi-core nanoparticle Monte Carlo simulation Metropolis algorithm Magnetic dipolar interaction Magnetic anisotropy Magnetization |
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