Publicações recentes

R.L. Silva, R.C. Silva, A.R. Pereira, and W.A. Moura-Melo, Antiferromagnetic skyrmions overcoming obstacles in a racetrack, Journal of Physics: Condensed Matter 31, 225802 (2019).

L. Resse, L.G.S. Oliveira, C.I.L. de Araujo, A.R. Pereira, and R.L. Silva, Periodic Néel skyrmion transport, Physics Letters A, https://doi.org/10.1016/j.physleta.2019.02.014 (aceito para publicação, 2019).

R.L. Fernandes, R.J.C. Lopes, and A.R. Pereira, Skyrmions and merons in two-dimensional antiferromagnetic systems, Solid State Communications 290, 55-59 (2019). https://doi.org/10.1016/j.ssc.2018.12.017

R. P. Loreto, F.S. Nascimento, R.S. Gonçalves, J. Borme, J.C. Cezar, C. Nisoli, A.R. Pereira, and C.I.L. de Araujo, Experimental and theoretical evidences for the ice regime in planar artificial spin ices, Journal of Physics: Condensed Matter 31, 025301 (2018) https://doi.org/10.1088/1361-648X/aaeeef .

R. Cacilhas, S. Vojkovic, E. B. Carvalho, V.L. Carvalho-Santos, A.R. Pereira, D. Altbir, and A´ S. Núñez, Coupling of skyrmions mediated by RKKY interaction, Applied Physics Letters 113, 212406 (2018).

I.R.B. Ribeiro, F.S. Nascimento, S.O. Ferreira, W.A. Moura-Melo, C.A.R. Costa, J. Borme, P.P. Freitas, G.M. Wysin, C.I.L. Araujo, and A.R. Pereira, Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology, Scientific Reports 7, 13982 (2017). DOI:10.1038/s41598-017-14421-w .

A.R. Moura and A.R. Pereira, A continuous analysis for the antiferromagnetic Heisenberg model on the checkerboard lattice. Journal of Magnetism and Magnetic Materials 441, 62 (2017). https://doi.org/10.1016/j.jmmm.2017.05.036 .

R.P. Loreto, W.A. Moura-Melo, A.R. Pereira, X. Zhang, Y. Zhou, M. Ezawa, and C.I.L. Araujo, Creation, transport and detection of imprinted magnetic solitons stabilized by spin-polarized current. Journal of Magnetism and Magnetic Materials, 455, 25-31 (2018) MAGMA 62678 https://doi.org/10.1016/j.jmmm.2017.04.074 .

E.A.S. Oliveira, R.L. Silva, R.C. Silva, and A.R. Pereira, Effects of second neighbor interactions on skyrmion lattices in chiral magnets. Journal of Physics: Condensed Matter 29, 205801 (2017). https://doi.org/10.1088/1361-648X/aa63dd

W.H. Campos, ; W.A. Moura-Melo, J.M. ; Fonseca, Geometrically induced reversion of Hall current in a topological insulator cavity. Physics Letters. A (Print) v. 381, 417-421, 2017.

I. R. B. Ribeiro, J. F. Felix, L. C. Figueiredo, P. C. Morais, S. O. Ferreira, W. A. Moura-Melo, A. R. Pereira, A. Quindeau, and C. I. L. de Araujo, Investigation of ferromagnetic resonance and magnetoresistance in anti-spin ice structures. Journal of Physics: Condensed Matter 28, 456002 (2016).

J. M. Fonseca, V. L. Carvalho-Santos,, W. A. Moura-Melo, and A. R. Pereira, Berry phases and zero-modes in toroidal topological insulator. European Physical Journal B 80:153 (2016). DOI:10.1140/epjb/e2016-70076-8

T.M. Melo, D.R. Viana, W.A. Moura-Melo, J. M. Fonseca, and A.R. Pereira, Topological Cutoff Frequency in a slab waveguide: Penetration Length in Topological Insulator Walls. Physics Letters A 380, 973-975 (2016).

R. P. Loreto, L. A. Morais, R. C. Silva, C. I. L. de Araujo,. W. A. Moura-Melo, A. R. Pereira, F. S. Nascimento, L.A.S. Mól, Emergence and mobility of monopoles in an unidirectional arrangement of magnetic nanoislands. Nanotechnology 26, 295303 (2015).

P.S.C. Vilas-Boas, R.G. Elias, G. Ricardo, D. Altbir, J.M. Fonseca, V.L. Carvalho-Santos. Topological magnetic solitons on a paraboloidal shell. Physics Letters. A (Print), v. 379, p. 47-53 (2015).

V.L. Carvalho Santos, R.G. Elias, J.M. Fonseca, D. Altbir, . Curvature-induced changes in the magnetic energy of vortices and skyrmions in paraboloidal nanoparticles. Journal of Applied Physics, v. 117, p. 17E518 (2015).

G.M. Wysin, A.R. Pereira, W.A. Moura-Melo, and C.I..L de Araujo, Order and thermalized dynamics in Heisenberg-like square and kagomé spin ices, Journal of Physics:Condensed Matter 27, 076004 (2015).

R.L. Silva, L.D. Secchin, W.A. Moura-Melo, A.R. Pereira, and R.L. Stamps, Emergence of Skyrmion Lattices and bimerons in chiral magnetic thin films with nonmagnetic impurities, Physical Review B 89, 054434 (2014).

C.I.L. de Araújo, R. C. Silva, I. R. B. Ribeiro, F.S. Nascimento, J.F. Felix, S.O. Ferreira, L.A.S. M´ol, W. A. Moura-Melo, and A. R. Pereira, Magnetic Vortex Crystal formation in the antidot complement of square artificial spin ice, Applied Physics Letters 104, 092402 (2014).

A.R. Moura, A.S.T. Pires, and A.R. Pereira, Phase transitions in the two-dimensional Anisotropic Biquadratic Heisenberg Model, Journal of Magnetism and Magnetic Materials 357, 45 (2014).

J.H. Rodrigues, L.A.S. Mól, W.A. Moura-Melo, and A.R. Pereira, Efficient demagnetization protocol for the artificial triangular spin ice, Applied Physics Letters 103, 092403 (2013). See also http://arxiv.org/abs/1306.3947

R.C. Silva, R.J.C. Lopes, L.A.S. Mól, W.A.Moura-Melo, and A.R. Pereira, Nambu monopoles interacting with lattice defects in two-dimensional artificial square spin ices, Physical Review B 87, 014414 (2013). See also arXiv:1208.2854.

G.M. Wysin, W.A. Moura-Melo, L.A.S. Mól, and A.R. Pereira, Dyanamics and hysteresis in square artificial spin ice, New Journal of Physics 15, 045029 (2013). See also arXiv:1208.6557.

A.R. Moura and A.R. Pereira, Study of the bilinear biquadratic Heisenberg model on a honeycomb lattice via Schwinger bosons, Journal of Magnetism and Magnetic Materials 342, 11 (2013), DOI: 10.1016/j.jmmm.2013.04.017 .See also arXiv:1209.5317 .

F.S. Nascimento, L.A.S. Mól, W.A. Moura-Melo, and A.R. Pereira, From confinement to deconfinement of magnetic monopoles in artificial rectangular spin ices, New Journal of Physics 14, 115019 (2012). See also arXiv:1208.5765. You can also see the video abstract of this paper at http://iopscience.iop.org/1367-2630/14/11/115019.

G.M. Wysin, W.A. Moura-Melo, L.A.S. Mól, and A.R. Pereira, Magnetic anisotropy of elongated thin ferromagnetic nano-islands for artificial spin ice arrays, Journal of Physics: Condensed Matter 24, 296001 (2012).

J.M. Fonseca, W.A. Moura-Melo, and A.R. Pereira, Geometrically induced electric polarization in conical topological insulators, Journal of Applied Physics 111, 064913 (2012).

L.A.S. Mól, A.R. Pereira, and W.A. Moura-Melo, Extending spin ice concepts to another geometry: the artificial triangular spin ice, Physical Review B 85,184410 (2012).

R.C. Silva, F.S. Nascimento, L.A.S. Mól, W.A. Moura-Melo, and A.R. Pereira, Thermodynamics of elementary excitations in artificial magnetic square ice, New Journal of Physics 14, 015008 (2012).

L.A.S. Mól, A.R. Pereira, and W.A. Moura-Melo, Comment on Geometry effect on the magnetic ordering of geometrically frustrated retangular and triangular magnets, Physics Letters A 375, 2680 (2011).

A.R. Pereira, L.A.S. Mól, and W.A. Moura-Melo, Magnetic monopoles in a low energy world: emergency and fractionalization in natural and artificial spin ices. In: IV International Conference of Fundamental Interactions. Proceendings of Science (PoS).ICFI-2010. 005-1 (2011).

A. Gomes, J. Fonseca, W.A. Moura-Melo, and A.R. Pereira, Testing electrodynamics with Lorentz and CPT violation in waveguides. In: IV International Conference of Fundamental Interactions. Proceendings of Science (PoS).ICFI-2010. 011-1 (2011).

J.M. Fonseca, W.A. Moura-Melo, and A.R. Pereira, Effects of lattice defects in graphene on the scattering of charge carriers. In: IV International Conference of Fundamental Interactions. Proceendings of Science (PoS).ICFI-2010. 015-1 (2011).

A.H. Gomes, J.M. Fonseca, W.A. Moura-Melo, and A.R. Pereira, Testing CPT and Lorentz odd electrodynamics with waveguides, Journal of High Energy Physics 2010, 104 (2010).

L.A.S. Mól, W.A. Moura-Melo, and A.R. Pereira, Conditions for free magnetic monopoles in nanoscale arrays of dipolar spin ice, Physical Review B 82, 054434 (2010).

J.M. Fonseca, W.A. Moura-Melo, and A.R. Pereira, Scattering off charge carriers in graphene induced by topological defects, Physics Letters A 374, 4359 (2010).

V.L. Carvalho-Santos, W.A. Moura-Melo, and A.R. Pereira, Miniaturization of vortex-comprising system using ferromagnetic nanotori, Journal of Applied Physics 108, 094310 (2010).

L.A. Mól, R.L.Silva, R.C. Silva, A.R. Pereira. W.A. Moura-Melo, and B.V. Costa, Magnetic monopole and string excitations in two-dimensional spin ice, Journal of Applied Physics 106, 063913 (2009).

F.A. Apolonio, W.A. Moura-Melo, F.P. Crisafuli, A.R. Pereira, and R.L. Silva, A model for structural defects in nanomagnets, Journal of Applied Physics 106, 084320 (2009).

R.L. Silva, A.R. Pereira, W.A. Moura-Melo, Magnetization reversals in a disk-shaped small magnet with an interface, Journal of Applied Physics 105, 014314 (2009).

M.A. Amaral, R.L. Silva, A.R. Pereira, W.A. Moura-Melo, Discrete double core skyrmions in magnetic thin films. Journal of Magnetism and Magnetic Materials 321, 3360 (2009).

N.M. Oliveira-Neto, S.G. Alves, R.L. Silva, A. R. Pereira; W.A. Moura-Melo, On topological phase transition in the two-dimensional XY-model on the Voronoi-Delaunay network. Journal of Physics. A, Mathematical and Theoretical 42, 385002 (2009).

A. R. Pereira, E. Ercolessi, and A.S.T. Pires, Nonlinear sigma model of a spin ladder containing a static single hole, Solid State Communications 145, 163 (2008).

A.R. Moura, A.R. Pereira, W. A. Moura-Melo, A.S.T. Pires, Skyrmion dynamics in single-hole Neel ordered doped two-dimensional antiferromagnets with arbitrary spin, Physics Letters A, 372, 4311 (2008).

V.L. Carvalho-Santos, A.R. Moura, W.A. Moura-Melo, and A. R. Pereira, Topological spin excitations on a rigid torus, Physical Review B 77, 134450 (2008).

W. A. Moura-Melo, N.M. Oliveira-Neto, A.R. Pereira, and R.L. Silva, How hole defects modify vortex dynamics in ferromagnetic nanodisks. Journal of Applied Physics 103, 124306 (2008).

R.L. Silva, A.R. Pereira, W.A. Moura-Melo, R.C. Silva, N. M. Oliveira-Neto, S.A. Leonel, and P.Z. Coura, Predicted defect-induced vortex core switching in thin magnetic nanodisks. Physical Review B 78, 054423 (2008).

A.R. Pereira, E. Ercolessi, and A.S.T. Pires, Pseudo-particles picture in single-hole doped two-dimensional Néel ordered antiferromagnet, Journal of Physics: Condensed Matter19, 156203 (2007).

L.R.A. Belo, N.M. Oliveira-Neto, W.A. Moura-Melo, A.R. Pereira, and E. Ercolessi, Heisenberg model on a space with negative curvature: topological spin texture on the pseudosphere, Physics Letters A 365, 463 (2007).

A.R. Pereira, A.R. Moura, W.A. Moura-Melo, D.F. Carneiro, S.A. Leonel, and P.Z. Coura, Analytical and Monte Carlo study of two antidots in magnetic nanodiscs with vortex-like magnetization, Journal of Applied Physics 101, 034310 (2007).

A.R. Moura, A.R. Pereira, and A.S.T. Pires, Casimir-energy-induced confinement and deconfinement of spinons in a two-dimensional anisotropic non-linear sigma model, Physical Review B 75, 014431 (2007).

W.A. Moura-Melo, A.R. Pereira, L.A.S. Mól, and A.S.T. Pires, Geometrical Pinning of magnetic vortices induced by a deficit angle on a surface: anisotropic spins on a conic space background, Physics Latters A 360, 472 (2007).

A.R. Pereira and G.M. Wysin, Hole-vortex-magnon interactions in diluted layered antiferromagnets with planar symmetry, Physical Review B 73, 214402 (2006).

L.A.S. Mól, A.R. Pereira, H. Chamati, and S. Romano, Monte Carlo study of 2D generalized XY-models, European Physical Journal B 50, 541 (2006).

H. Chamati, S. Romano, L.A.S. Mól, and A.R. Pereira, Three dimensional generalized xy models: a Monte Carlo study, Europhysics Letters 72, 62 (2005).

A.R. Pereira, Inhomogeneous states in permalloy nanodisks with point defects, Physical Review B 71, 224404 (2005).

G.M. Wysin, A.R. Pereira, I.A. Marques, S.A. Leonel, and P.Z. Coura, Extinction of BKT transition by nonmagnetic disorder in planar-symmetry spin models, Physical Review B 72, 094418 (2005).

R.L. Silva, P.R.C. Guimarães, and A.R. Pereira, Field-induced nonmagnetic impurities interaction in the quantum Ising chain, Solid State Communications 134, 313 (2005).

F.M. Paula, A.R. Pereira, and G.M. Wysin, Contribution of impurity-pinned vortices to the response function in randomly diluted easy-plane ferromagnet on a square lattice, Physical Review B 72, 094425 (2005).

A.R. Pereira, Hysteresis trace in cylindrical magnetic nanoparticles with individual defects, Journal of Applied Physics 97, 094303 (2005).

W.A. Freitas, W.A. Moura-Melo, A.R. Pereira, Heisenberg spins on a cone: an interplay between geometry and magnetism, Physics Letters A 336, 412 (2005).

A.R. Pereira, S.A. Leonel, P.Z. Coura and B.V. Costa, Vortex motion induced by lattice defects in two-dimensional easy-plane magnets, Physical Review B 71, 014403 (2005).

A.R. Pereira, Heisenberg spins on a circular conical surface, Journal of Magnetism and Magnetic Materials 285, 60 (2005).

F.M. Paula, A.R. Pereira, L.A.S. Mol, Diluted planar ferromagnets: nonlinear excitations on a non-simply connected manifold, Physics Letters A 329, 155 (2004).

A.R. Pereira, Vortex-antivortex pair fluctuations in quenched diluted easy-plane magnets, Journal of Magnetism and Magnetic Materials 279, 346 (2004).

L.A.S. Mól, A.R. Pereira, and W.A. Moura-Melo, On phase transition and vortex stability in the generalized XY models, Physics Letters A 319, 114 (2003).

L.A.S. Mól, A.R. Pereira, and W.A. Moura-Melo, On phase transition and vortex stability in the generalized XY models, Physics Letters A 319, 114 (2003).

M.P.P. Fonseca and A.R. Pereira, Topological excitations near a spinless atom in layered antiferromagnets with an axial magnetic field, Physica Status Solidi B 240, 176 (2003).

A.R. Pereira, L.A.S. Mol, S.A. Leonel, P.Z. Coura, and B.V. Costa, Vortex behavior near a spin vacancy in two-dimensional XY magnets, Physical Review B 68, 132409 (2003).

A.R. Pereira, Solitons in a trapped state inside a well induced by a spinless site in 2D ferromagnets and ferrimagnets, Physics Letters A 314, 102 (2003).

L.A.S. Mól, A.R. Pereira, and W.A. Moura-Melo, Oscillating solitons pinned to a nonmagnetic impurity in layered antiferromagnets, Physical Review B, 132403 (2003).

S.A. Leonel, P.Z. Coura, A.R. Pereira, L.A.S. Mól, and B.V. Costa, Monte Carlo study of the critical temperature for the planar rotator model with nonmagnetic impurities, Physical Review B 67, 104426 (2003).

A.R. Pereira, Small amplitude oscillations of sine-Gordon votes states in planar magnets in three dimensions, Brazilian Journal of Physics 32, 815 (2002).

A.R. Pereira and A.S.T. Pires, Solitons in the presence of a static spin vacancy on a 2D Heisenberg antiferromagnet, Journal of Magnetism and Magnetic Materials 257, 290 (2003).

M.P.P. Fonseca and A.R. Pereira, Scattering of magnons by a vortex pair in a two-dimensional classical XY model with an in-plane magnetic field, Physical Review B 66, 052102 (2002).

L.A.S. Mól, A.R. Pereira , and A.S.T. Pires, Planar vortex in two-dimensional XY ferromagnets with a nonmagnetic impurity potential, Physical Review B 66, 052415 (2002).

G.M. Rocha-Fillho and A.R. Pereira, Dynamical skyrmions in Heisenberg two-dimensional easy-axis ferromagnets, Solid State Communications 122, 83 (2002).

E.A. Silva and A.R. Pereira, Internal oscillations of solitons in ferromagnets on a cylinder in an axial magnetic field, Solid State Communications 113, 699 (2000).

A.R. Pereira and A.S.T. Pires, Vortex-antivortex contribution to EPR linewidth in two-dimensional easy-plane antiferromagnets, Physical Review B 60, 6226 (1999).

E.A. Silva and A.R. Pereira, Quantized topological solitons in antiferromagnets on an infinite cylinder, Physica Status Solidi B 213, 481 (1999).

A.R. Pereira and A.S.T. Pires, Magnon waveforms in the presence of a vortex-pair in easy-plane antiferromagnets, Solid State Communications 111, 73 (1999).

A.R. Pereira and J.E.R. Costa, Vortex-pairs and the central peak in the dynamical structure factor in the 2D XY model below T-KT, Journal of Magnetism and Magnetic Materials 162, 219 (1996).

A.R. Pereira, Vibrational mode of solitons in two-dimensional easy-plane antiferromagnets, Physical Review B 54, 11918 (1996).

A.R. Pereira, F.O. Coelho, and A.S.T. Pires, Normal modes of vortices in easy-plane antiferromagnets: Exact results and Born approximation, Physical Review B 54, 6084 (1996).

A.R. Pereira and A.S.T. Pires, Magnon-vortex interaction in a two-dimensional XY antiferromagnet, Solid State Communications 99, 789 (1996).

B.V. Costa, A.R. Pereira, and A.S.T. Pires, Monte Carlo calculation of the transition temperature of the anisotropic three-dimensional XY model, Physical Review B 54, 3019 (1996).

A.R. Pereira, A.S.T. Pires, and M.E. Gouvêa, Quantum fluctuations of solitons in 2-dimensional ansitropic sigma-models, Physical Review B 51, 15974 (1995).

A.R. Pereira, A.S.T. Pires, and M.E. Gouvêa, Phase-transition in the spatially anisotropic classical XY model, Physical Review B 51, 16413 (1995).

A.R. Pereira and A.S.T. Pires, Dynamics of vortices in a 2-dimensional easy-plane antiferromagnet, Physical Review B 51, 996 (1995).

A.R. Pereira, A.S.T. Pires, and M.E. Gouvêa, Quantum fluctuations of vortex-antivortex in 2-dimesnional ferromagnets, Journal of Magnetism and Magnetic Materials 134, 121 (1994).

A.S.T. Pires, A.R. Pereira, and M.E. Gouvêa, Low-temeprature static and dynamic behavior of the layered classical XY ferromagnet, Physical Review B 49, 9663 (1994).

A.R. Pereira, A.S.T. Pires, and M.E. Gouvêa, Spin-wave scattering by solitons in a 2-dimensional easy-axis ferromagnetic model, Physics Letters A 176, 279 (1993).

A.R. Pereira, A.S.T. Pires, and M.E. Gouvêa, Spin-wave scattering by vórtices in a 2-dimensional easy-plane ferromagnetic model, Solid State Communications 86, 187 (1993).

A.R. Pereira, A.S.T. Pires, M.E. Gouvêa, and B.V. Costa, Dynamic correlation from topological solitons in 2-dimensional anisotropic models, Zeitschrift Fur Physik B 89, 109 (1992).