### 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 |
---|---|

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 |

Externally published | Yes |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Condensed Matter Physics

### 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

**Finite dipolar hexagonal columns on piled layers of triangular lattice.** / Matsushita, Katsuyoshi; Sugano, Ryoko; Kuroda, Akiyoshi; Tomita, Yusuke; Takayama, Hajime.

Research output: Contribution to journal › Article

*Journal of Magnetism and Magnetic Materials*, vol. 310, no. 2 SUPPL. PART 2, pp. 1416-1418. https://doi.org/10.1016/j.jmmm.2006.10.426

}

TY - JOUR

T1 - Finite dipolar hexagonal columns on piled layers of triangular lattice

AU - Matsushita, Katsuyoshi

AU - Sugano, Ryoko

AU - Kuroda, Akiyoshi

AU - Tomita, Yusuke

AU - Takayama, Hajime

PY - 2007/3

Y1 - 2007/3

N2 - 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.

AB - 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.

KW - Dipole-dipole interaction

KW - Finite size effect

KW - Magnetic nanoparticles

KW - Monte Carlo simulation

UR - http://www.scopus.com/inward/record.url?scp=33847267332&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847267332&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2006.10.426

DO - 10.1016/j.jmmm.2006.10.426

M3 - Article

VL - 310

SP - 1416

EP - 1418

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 2 SUPPL. PART 2

ER -