112 citations · 743 across the 33 of their papers we have counts for
6 papers · 1 filter
Vortex core dynamics induced by hole defects in antiferromagnetic nanodisks
R. L. Silva, R. D. Pereira, A. R. Pereira +3
Direct observation of vortex states in an antiferromagnetic layer have been recently reported [Wu, et al, Nature Phys. 7, 303 (2011)]. In contrast to their analogues in ferromagnet…
Conditions for free magnetic monopoles in nanoscale square arrays of dipolar spin ice
L. A. S. Mól, W. A. Moura-Melo, A. R. Pereira
We study a modified frustrated dipolar array recently proposed by Möller and Moessner [Phys. Rev. Lett. \textbf{96}, 237202 (2006)], which is based on an array manufactured lithogr…
Magnetic monopole and string excitations in a two-dimensional spin ice
L. A. S. Mol, R. L. Silva, R. C. Silva +3
We study the magnetic excitations of a square lattice spin-ice recently produced in an artificial form, as an array of nanoscale magnets. Our analysis, based upon the dipolar inter…
Analytical and Monte Carlo study of two antidots in magnetic nanodisks with vortex-like magnetization
A. R. Pereira, A. R. Moura, W. A. Moura-Melo +3
How stable vortex-like magnetization in magnetic nanodisks with small aspect ratio () is affected by two antidots is investigated analytically and by Monte Carlo simulation…
Geometrical pinning of magnetic vortices induced by a deficit angle on a surface: anisotropic spins on a conic space background
W. A. Moura-Melo, A. R. Pereira, L. A. S. Mol +1
We study magnetic vortex-like excitations lying on a conic space background. Two types of them are obtained. Their energies appear to be linearly dependent on the conical aperture…
Extinction of BKT transition by nonmagnetic disorder in planar-symmetry spin models
G. M. Wysin, A. R. Pereira, I. A. Marques +2
The Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional planar rotator and XY models on a square lattice, diluted by randomly placed vacancies, is studied here usin…