Ground states and magnetization process for an triangular lattice array of magnetic dots with perpendicular anisotropy

TL;DR

This paper investigates the ground state and magnetization process of a two-dimensional triangular lattice of magnetic dots with perpendicular anisotropy, revealing unique antiferromagnetic order and defect-driven magnetization behavior.

Contribution

It provides a detailed analysis of the ground state and magnetization process in a triangular lattice of magnetic dots, highlighting the role of topological defects unlike rectangular lattices.

Findings

Specific antiferromagnetic order in small fields due to dipole interactions

Magnetization involves formation of topological defects (dislocations)

Distinct behavior compared to rectangular lattice arrangements

Abstract

We analyzed the ground state of the array of magnetic particles (magnetic dots) which form a two-dimensional triangular lattice, and magnetic moment of which is perpendicular to the plane of the lattice, in the presence of external magnetic field. In the small fields long range dipole-dipole interaction leads to the specific antiferromagnetic order, where two out of six nearest neighbors of the particle have the same direction of magnetization moment and four - the opposite one. It is shown that magnetization process in such array of particles as opposed to the rectangular lattices results from the formation of the magnetized topological defects (dislocations) in the shape of the domain walls.