Intrinsic localized modes in a two-dimensional checkerboard ferromagnetic lattice

TL;DR

This paper analytically investigates intrinsic localized modes in a two-dimensional checkerboard ferromagnetic lattice, revealing how interactions influence mode structures using an asymptotic reduction to a nonlinear Schrödinger equation.

Contribution

It introduces a novel analytical approach to identify and analyze localized modes in a 2D ferromagnetic lattice, highlighting the effects of competing interactions.

Findings

Identified two types of localized modes: Brillouin zone center and corner modes.

Derived conditions for the occurrence of these localized modes.

Showed the influence of interaction competition on mode structure.

Abstract

An analytical work on intrinsic localized modes in a two-dimensional Heisenberg ferromagnet on the checkerboard lattice is presented. Taking advantage of an asymptotic method, the governing lattice dynamical equations are reduced to one (2+1) -dimensional nonlinear Schr\"odinger. In our work, we obtain two types of nonlinear localized mode solutions, namely, Brillouin zone center modes and Brillouin zone corner modes. The occurrence conditions for these intrinsic localized modes are given in detail. Especially, we find that the competition between the Dzialozinskii-Moriy interaction and the next-nearest neighbor interaction of the checkerboard ferromagnet has an effect on the local structure of the Brillouin zone corner acoustic mode.