Condensed Matter Physics, 2014, vol. 17, No. 3, p. 33701:1-10

Title: Self-organization of topological defects for a triangular-lattice magnetic dots array subject to a perpendicular magnetic field
  R.S. Khymyn ( Oakland University, 48309 Rochester Hills, MI, USA ) ,
  V.E. Kireev ( Institute of Magnetism, 03142 Kiev, Ukraine ) ,
  B.O. Ivanov ( Institute of Magnetism, 03142 Kiev, Ukraine )

The regular array of magnetic particles (magnetic dots) of the form of a two-dimensional triangular lattice in the presence of external magnetic field demonstrates complicated magnetic structures. The magnetic symmetry of the ground state for such a system is lower than that for the underlying lattice. Long range dipole-dipole interaction leads to a specific antiferromagnetic order in small fields, whereas a set of linear topological defects appears with the growth of the magnetic field. Self-organization of such defects determines the magnetization process for a system within a wide range of external magnetic fields.

Key words: magnetic dot, topological defect
PACS: 75.10.Hk, 75.50.Tt, 75.30.Kz

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