31 citations · 115 across the 8 of their papers we have counts for
8 papers
On geometry-dependent vortex stability and topological spin excitations on curved surfaces with cylindrical symmetry
Vagson L. Carvalho-Santos, Felipe A. Apolonio, Nemésio M. Oliveira-Neto
We study the Heisenberg Model on cylindrically symmetric curved surfaces. Two kinds of excitations are considered. The first is given by the isotropic regime, yielding the sine-Gor…
Predicted defect induced vortex core switching in thin magnetic nanodisks
R. L. Silva, A. R. Pereira, W. A. Moura-Melo +4
We investigate the influence of artificial defects (small holes) inserted into magnetic nanodisks on the vortex core dynamics. One and two holes (antidots) are considered. In gener…
How hole defects modify vortex dynamics in ferromagnetic nanodisks
W. A. Moura-Melo, A. R. Pereira, R. L. Silva +1
Defects introduced in ferromagnetic nanodisks may deeply affect the structure and dynamics of stable vortex-like magnetization. Here, analytical techniques are used for studying, a…
A class of generalised Jordan-Schwinger maps
N M Oliveira-Neto, E M F Curado, M A Rego-Monteiro
In this article we introduce a class of generalisations of the Jordan-Schwinger (JS) map which realises the recent proposed generalised sl(2) (G-sl(2)) algebra via two independent…
Heisenberg model on a space with negative curvature: topological spin textures on the pseudosphere
L. R. A. Belo, N. M. Oliveira-Neto, W. A. Moura-Melo +2
Heisenberg-like spins lying on the pseudosphere (a 2-dimensional infinite space with constant negative curvature) cannot give rise to stable soliton solutions. Only fractional solu…
Low-Temperature Quasi-Equilibrium States in the Hydrogen Atom
N. M. Oliveira-Neto, E. M. F. Curado, F. D. Nobre +1
The dynamics of the approach to equilibrium of the hydrogen atom is investigated numerically through a Monte Carlo procedure. We show that, before approaching ionization, the hydro…