Monte Carlo simulation of magnetic multi-core nanoparticles
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- 作者：Vincent Schaller ; Gö ; ran Wahnströ ; m ; Anke Sanz-Velasco ; Peter Enoksson ; Christer Johansson
- 关键词：Magnetic multi-core nanoparticle ; Monte Carlo simulation ; Metropolis algorithm ; Magnetic dipolar interaction ; Magnetic anisotropy ; Magnetization
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2009
- 出版时间：May 2009
- 年：2009
- 卷：321
- 期：10
- 页码：1400-1403
- 全文大小：314 K
文摘
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.