### Abstract

We have investigated, by the Monte Carlo simulation, spin systems which represent moments of arrayed magnetic nanoparticles interacting with each other only by the dipole-dipole interaction. In the present paper we aim the understanding of finite size effects on the magnetic nanoparticles arrayed in hexagonal columns cut out from the close-packing structures or from those with uniaxial compression. In columns with the genuine close-packing structures, we observe a single vortex state which is also observed previously in finite two-dimensional systems. On the other hand in the system with the inter-layer distance set 1 / sqrt(2) times of the close-packing one, we found ground states which depend on the number of layers. The dependence is induced by a finite size effect and is related to a orientation transition in the corresponding bulk system.

Original language | English |
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Pages (from-to) | 1416-1418 |

Number of pages | 3 |

Journal | Journal of Magnetism and Magnetic Materials |

Volume | 310 |

Issue number | 2 SUPPL. PART 2 |

DOIs | |

Publication status | Published - 2007 Mar 1 |

### Keywords

- Dipole-dipole interaction
- Finite size effect
- Magnetic nanoparticles
- Monte Carlo simulation

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

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## Cite this

*Journal of Magnetism and Magnetic Materials*,

*310*(2 SUPPL. PART 2), 1416-1418. https://doi.org/10.1016/j.jmmm.2006.10.426