title: Effects of second neighbor interactions on skyrmion lattices in chiral magnets.
abstract: In this paper we investigate the influences of the second neighbor interactions on a skyrmion lattice in two-dimensional chiral magnets. Such a system contains the exchange and the Dzyaloshinskii-Moriya for the spin interactions and therefore, we analyse three situations: firstly, the second neighbor interaction is present only in the exchange coupling; secondly, it is present only in the Dzyaloshinskii-Moriya coupling. Finally, the second neighbor interactions are present in both exchange and Dzyaloshinskii-Moriya couplings. We show that such effects cause important modifications to the helical and skyrmion phases when an external magnetic field is applied.
authors.affiliation: Coordenadoria de Física, Instituto Federal do Espírito Santo, Av. Vitória, 1729- Jucutuquara, Vitória, ES, 29040-780, Brazil.
authors.forename: E A S
authors.initials: EAS
authors.lastname: Oliveira
authors.forename: R L
authors.initials: RL
authors.lastname: Silva
authors.forename: R C
authors.initials: RC
authors.lastname: Silva
authors.forename: A R
authors.initials: AR
authors.lastname: Pereira