34 citations · 158 across the 21 of their papers we have counts for
22 papers
Soliton motion induced along ferromagnetic skyrmion chains in chiral thin nanotracks
J. C. Bellizotti Souza, N. P. Vizarim, C. J. O. Reichhardt +2
Using atomistic magnetic simulations we investigate the soliton motion along a pinned skyrmion chain containing an interstitial skyrmion. We find that the soliton can exhibit stabl…
Magnetic interactions of 4 electrons in the topological insulator chalcogenide BiSe
J. C. Souza, M. Carlone, G. G. Lesseux +5
The gap opening mechanism of a topological insulator, the quantum anomalous Hall effect and the axion physics are still pressing open questions and a microscopic viewpoint to furth…
Magnus Induced Diode Effect for Skyrmions in Channels with Periodic Potentials
J. C. Bellizotti Souza, N. P. Vizarim, C. J. O. Reichhardt +2
Using a particle based model, we investigate the skyrmion dynamical behavior in a channel where the upper wall contains divots of one depth and the lower wall contains divots of a…
Clogging, Diode and Collective Effects of Skyrmions in Funnel Geometries
J. C. Bellizotti Souza, N. P. Vizarim, C. J. O. Reichhardt +2
Using a particle-based model, we examine the collective dynamics of skyrmions interacting with a funnel potential under dc driving as the skyrmion density and relative strength of…
Soliton Motion in Skyrmion Chains
N. P. Vizarim, J. C. Bellizotti Souza, C. J. O. Reichhardt +3
Using a particle-based model we examine the depinning motion of solitons in skyrmion chains in quasi-one dimensional (1D) and two-dimensional (2D) systems containing embedded 1D in…
Slow crystalline electric field fluctuations in the Kondo lattice SmB
M. Carlone, J. C. Souza, J. Sichelschmidt +7
This work reports on the temperature dependence of the electron spin resonance (ESR) of Gd-doped SmB single crystals at X- and Q-band microwave frequencies in differen…
Skyrmion Ratchet in Funnel Geometries
J. C. Bellizotti Souza, N. P. Vizarim, C. J. O. Reichhardt +2
Using a particle-based model, we simulate the behavior of a skyrmion under the influence of asymmetric funnel geometries and ac driving at zero temperature. We specifically investi…
Metallic islands in the Kondo insulator SmB
J. C. Souza, P. F. S. Rosa, J. Sichelschmidt +7
The predicted interplay between Kondo physics and non-trivial topology in SmB has stimulated many experimental reports, some of which are in apparent contradiction. The origi…
Guided Skyrmion Motion Along Pinning Array Interfaces
N. P. Vizarim, C. Reichhardt, P. A. Venegas +1
We examine ac driven skyrmions interacting with the interface between two different obstacle array structures. We consider drive amplitudes at which skyrmions in a bulk obstacle la…
Skyrmion Pinball and Directed Motion on Obstacle Arrays
N. P. Vizarim, C. J. O. Reichhardt, P. A. Venegas +1
We examine skyrmions interacting with a square array of obstacles under ac drives applied in one or two directions. For a single direction of ac driving, we find that the Magnus fo…
Skyrmion Dynamics and Transverse Mobility: Skyrmion Hall Angle Reversal on 2D Periodic Substrates with dc and Biharmonic ac Drives
N. P. Vizarim, C. J. O. Reichhardt, P. A. Venegas +1
We numerically examine the dynamics of a skyrmion interacting with a two-dimensional periodic substrate under dc and biharmonic ac drives. We show that the Magnus force of the skyr…
Shapiro Steps and Nonlinear Skyrmion Hall Angles For dc and ac Driven Skyrmions on a Two Dimensional Periodic Substrate
N. P. Vizarim, C. Reichhardt, P. A. Venegas +1
For an overdamped particle moving over a two-dimensional periodic substrate under combined dc and ac drives, a series of steps can appear in the velocity force curves that are know…
Mathematical analysis and numerical solution of models with dynamic Preisach hysteresis
A. Bermúdez, D. Gómez, P. Venegas
Hysteresis is a phenomenon that is observed in a great variety of physical systems, which leads to a nonlinear and multivalued behavior, making their modeling and control difficult…
Controlling the Kelvin Force: Basic Strategies and Applications to Magnetic Drug Targeting
Harbir Antil, Ricardo H. Nochetto, Pablo Venegas
Motivated by problems arising in magnetic drug targeting, we propose to generate an almost constant Kelvin (magnetic) force in a target subdomain, moving along a prescribed traject…
Optimizing the Kelvin force in a moving target subdomain
Harbir Antil, Ricardo H. Nochetto, Pablo Venegas
In order to generate a desired Kelvin (magnetic) force in a target subdomain moving along a prescribed trajectory, we propose a minimization problem with a tracking type cost funct…
Collapse of the ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor
P. A. Venegas, F. A. Garcia, D. J. Garcia +3
Experiments on the Electron Spin Resonance (ESR) in the filled skutterudite (), at temperatures where the host resistivity m…
Critical Currents and Melting Temperature of a Two-dimensional Vortex Lattice with Periodic Pinning
L. G. Verga, M. M. Bonilha, M. Carlone +1
The critical current and melting temperature of a vortex system are analyzed. Calculations are made for a two dimensional film at finite temperature with two kinds of periodic pinn…
Role of Interstitial Pinning in the Dynamical Phases of Vortices in Superconducting Films
R. P. Simões, P. A. Venegas, D. F. Mello
We analyze the vortex dynamics in superconducting thin films with a periodic array of pinning centers. In particular, we study the effect of anisotropy for a Kagomé pinning network…
The Effects of Pinning on Critical Currents of Superconducting Films
R. P. Simões, P. A. Venegas, D. F. Mello
Using molecular dynamics simulations, we analyze the effects of artificial periodic arrays of pinning sites on the critical current of superconducting thin films as a function of v…
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe4P12 (x = 0.001) skutterudite
F. A. Garcia, P. A. Venegas, P. G. Pagliuso +4
We report electron spin resonance (ESR) measurements in the Gd3+ doped semiconducting filled skutterudite compound Ce1-xGdxFe4P12 (x = 0.001). As the temperature T varies from T =…
Vortex Lattice and Matching Fields for a Long Superconducting Wire
Pablo A. Venegas, Edson Sardella
We investigate the flux penetration patterns and matching fields of a long cylindrical wire of circular cross section in the presence of an external magnetic field. For this study…
Exchange Narrowing Effects in the EPR Linewidth of Gd Diluted in Ce Compounds
Pablo A. Venegas, Paulo R. S. Netto
Anomalous thermal behavior on the EPR linewidths of Gd impurities diluted in Ce compounds has been observed. In metals, the local magnetic moment EPR linewidth, ΔH, is expected to…