119 citations · 1.1k across the 55 of their papers we have counts for
23 papers · 1 filter
On the coexistence of dipolar frustration and criticality in ferromagnets
Sergio A. Cannas, Alessandro Vindigni
In real magnets the tendency towards ferromagnetism, promoted by exchange coupling, is usually frustrated by dipolar interaction. As a result, the uniformly ordered phase is replac…
Modulated phases in external fields: when is reentrant behavior to be expected?
Alejandro Mendoza-Coto, Orlando V. Billoni, Sergio A. Cannas +1
We introduce a new coarse grain model capable of describing the phase behavior of two dimensional ferromagnetic systems with competing exchange and dipolar interactions, as well as…
Critical behavior of self-assembled rigid rods on two-dimensional lattices: Bethe-Peierls approximation and Monte Carlo simulations
L. G. López, D. H. Linares, A. J. Ramirez-Pastor +2
The critical behavior of adsorbed monomers that reversibly polymerize into linear chains with restricted orientations relative to the substrate has been studied. In the model consi…
Finite temperature phase diagram of ultrathin magnetic films without external fields
Santiago A. Pighin, Orlando V. Billoni, Sergio A. Cannas
We analyze the finite temperature phase diagram of ultrathin magnetic films by introducing a mean field theory, valid in the low anisotropy regime, i.e., close to de Spin Reorienta…
Inverse transition in the two dimensional dipolar frustrated ferromagnet
Sergio A. Cannas, Marianella Carubelli, Orlando V. Billoni +1
We show that the mean field phase diagram of the dipolar frustrated ferromagnet in an external field presents an inverse transition in the field-temperature plane. The presence of…
q-State Potts model metastability study using optimized GPU-based Monte Carlo algorithms
Ezequiel E. Ferrero, Juan Pablo De Francesco, Nicolás Wolovick +1
We implemented a GPU based parallel code to perform Monte Carlo simulations of the two dimensional q-state Potts model. The algorithm is based on a checkerboard update scheme and a…
Phase diagram of self-assembled rigid rods on two-dimensional lattices: Theory and Monte Carlo simulations
L. G. López, D. H. Linares, A. J. Ramirez-Pastor +1
Monte Carlo simulations and finite-size scaling analysis have been carried out to study the critical behavior in a two-dimensional system of particles with two bonding sites that,…
Short-time dynamics of finite-size mean-field systems
Celia Anteneodo, Ezequiel E. Ferrero, Sergio A. Cannas
We study the short-time dynamics of a mean-field model with non-conserved order parameter (Curie-Weiss with Glauber dynamics) by solving the associated Fokker-Planck equation. We o…
Non-equilibrium Characterization of Spinodal Points using Short Time Dynamics
Ernesto S. Loscar, Ezequiel E. Ferrero, Tomas S. Grigera +1
Though intuitively appealing, the concept of spinodal is rigourously defined only in systems with infinite range interactions (mean field systems). In short-range systems, a pseudo…
Interplay between coarsening and nucleation in an Ising model with dipolar interactions
S. A. Cannas, M. F. Michelon, D. A. Stariolo +1
We study the dynamical behavior of a square lattice Ising model with exchange and dipolar interactions by means of Monte Carlo simulations. After a sudden quench to low temperature…
Long term ordering kinetics of the two dimensional q-state Potts model
Ezequiel E. Ferrero, Sergio A. Cannas
We studied the non-equilibrium dynamics of the q-state Potts model in the square lattice, after a quench to sub-critical temperatures. By means of a continuous time Monte Carlo alg…
Comment on ``Phase transitions in a square Ising model with exchange and dipole interactions'' by E. Rastelli, S. Regina and A. Tassi
Sergio A. Cannas, Mateus F. Michelon, Francisco A. Tamarit
We discuss numerical results presented in a recent ppublication about the critical properties of a two dimensional Ising model with exchange and dipolar interactions.
Phase diagram of an Ising model for ultrathin magnetic films
S. A. Pighin, S. A. Cannas
We study the critical properties of a two--dimensional Ising model with competing ferromagnetic exchange and dipolar interactions, which models an ultra-thin magnetic film with hig…
Phase separation of the Potts model in que square lattice
Miguel Ibanez de Berganza, Ezequiel E. Ferrero, Sergio A. Cannas +2
When the two dimensional q-color Potts model in the square lattice is quenched at zero temperature with Glauber dynamics, the energy decreases in time following an Allen-Cahn power…
Ising nematic phase in ultra-thin magnetic films: a Monte Carlo study
S. A. Cannas, M. F. Michelon, D. A. Stariolo +1
We study the critical properties of a two--dimensional Ising model with competing ferromagnetic exchange and dipolar interactions, which models an ultra-thin magnetic film with hig…
Two dimensional Ising model with long-range competing interactions
Sergio A. Cannas, Pablo M. Gleiser, Francisco A. Tamarit
The two-dimensional Ising model with competing short range ferromagnetic interactions and long range antiferromagnetic interactions is perhaps the most simple one containing the mi…
Stripe-tetragonal first order phase transition in ultra-thin magnetic films
Sergio A. Cannas, Daniel A. Stariolo, Francisco A. Tamarit
We analyze the nature of the phase transition from a smectic stripe phase to a tetragonal phase predicted in analytic studies by Abanov et al. (Phys. Rev. B 51, 1023 (1995)) and ob…
Testing boundary conditions efficiency in simulations of long-range interacting magnetic models
Sergio A. Cannas, Cintia M. Lapilli, Daniel A. Stariolo
Periodic boundary conditions have not a unique implementation in magnetic systems where all spins interact with each other through a power law decaying interaction of the form $1/r…
Non glassy ground-state in a long-range antiferromagnetic frustrated model in the hypercubic cell
Leonardo Franco, Sergio A. Cannas
We analize the statistical mechanics of a long-range antiferromagnetic model defined on a D-dimensional hypercube, both at zero and finite temperatures. The associated Hamiltonian…
Dynamics of ferromagnetic spherical spin models with power law interactions: exact solution
Sergio A. Cannas, Daniel A. Stariolo, Francisco A. Tamarit
We solve the Langevin dynamics of d-dimensional ferromagnetic spherical models with interactions that decay with distance as r^-(d+sigma). The long time dynamics of correlations an…
Aging in a Two-Dimensional Ising Model with Dipolar Interactions
Julio H. Toloza, Francisco A. Tamarit, Sergio A. Cannas
Aging in a two-dimensional Ising spin model with both ferromagnetic exchange and antiferromagnetic dipolar interactions is established and investigated via Monte Carlo simulations.…
Phase diagram of a stochastic cellular automaton with long-range interactions
Sergio A. Cannas
We introduce a stochastic cellular automaton with power law spatial decaying long-range interactions. In some limit this model reduces to the Domany-Kinzel cellular automaton. Mont…
Sensitivity to Initial Conditions and Nonextensivity in Biological Evolution
Francisco A. Tamarit, Sergio A. Cannas, Constantino Tsallis
We consider biological evolution as described within the Bak and Sneppen 1993 model. We exhibit, at the self-organized critical state, a power-law sensitivity to the initial condit…