arXiv subjects

Maria A. Medvedeva

Publications and source records attributed to Maria A. Medvedeva.

2 recordsLinked to original sources

arXiv2015

Dimensional effects in ultrathin magnetic films

Dimensional effects in the critical properties of multilayer Heisenberg films have been numerically studied by Monte Carlo methods. The effect of anisotropy created by the crystal field of a substrate has been taken into account for films with various thicknesses. The calculated critical exponents demonstrate a dimensional transition from two-dimensional to three-dimensional properties of the films with an increase in the number of layers. A spin-orientation transition to a planar phase has been revealed in films with thicknesses corresponding to the crossover region.

cond-mat.stat-mech↗

arXiv2012

Non-equilibrium critical relaxation of the 3D Heisenberg magnets with long-range correlated disorder

Monte Carlo simulations of the short-time dynamic behavior are reported for three-dimensional Heisenberg model with long-range correlated disorder at criticality, in the case corresponding to linear defects. The static and dynamic critical exponents are determined for systems starting from an ordered initial state. The obtained values of the exponents are in a good agreement with results of the field-theoretic description of the critical behavior of this model in the two-loop approximation.

cond-mat.dis-nn↗