Monte Carlo Simulation of Magnetotransport Properties in $\hbox{La}_{0.67}\hbox{Ca}_{0.33}\hbox{MnO}_{3}$ (FM) and $\hbox{La}_{0.33}\hbox{Ca}_{0.67}\hbox{MnO}_{3}$ (AF) Thin Films

Manganese perovskites have recently been the focus of renewed interest, due to the "colossal" magnetoresistance (CMR) effect and the coupled metal-insulator and magnetic transitions displayed at the spin-ordering temperature T
_C
by some of these compounds. The essential ingredient of the CMR physics is not only the double-exchange interaction but also other competing interactions, such as ferromagnetic/antiferromagnetic superexchange interactions and charge/orbital ordering instabilities as well as their strong coupling with lattice distortion. In this work, a magnetotransport properties simulation of ferromagnetic (FM) La
_0.67
Ca
_0.33
MnO
₃
and antiferro magnetic (AF) La
_0.33
Ca
_0.67
MnO
₃
as a function of the temperature and the magnetic field is presented and discussed. Our study is addressed by using the Monte Carlo method on the basis of a Heisenberg model. Films thickness and external magnetic field influence on the resistivity and magnetoresistance (MR) was analyzed.