DefinePK

Abstract

Standard Metropolis Monte Carlo (S-MMC) simulations allowed us to calculate magnetization as a function of temperature and magnetic field, for theLa0.66Ca0.33Mn(1-x)4+FexMn3+O3(x=0, 5, 10, 20 and 30 %)(LCMFx) compound. The respective critical exponents for M(T), H/M(H) and M(H,T=Tc) close to the critical temperature, were calculated using the Arrott plot (AP). The values of the critical exponents evinced a type of magnetic universality present in this type of material. The results of the simulation leads us to believe that there is a correlation between the displacement of the magnetic transition temperature (ferromagnetic-paramagnetic), which is characterized by the Curie temperature and an increased percentage of iron present in material. On the other hand, the model determines a value of the critical temperature and this is correlated to the number of Monte Carlo Steps (MCS). For a number of MCS of the order of 102, the system tends to relax with the transition temperature which depends on the percentage of iron. By comparing the Tc values determined based on the two methodologies M(T) and AP, we can see that, the greater percentage of iron in the material, the more distance between the two trends. Based on these results, it is possible to infer that the increased percentage of Fe increases the presence of effects in the material that lead to an increased variation of the magnetic anisotropy.