Abstract

Based on Ising model, the effects of nearest and next-nearest neighbor interactions on the magnetic properties of films with BCC structure have been studied by an improved 4×4 transfer matrix method. The dependence of the phase transition temperature <i>T<sub>C</sub></i>on both the ratio of surface coupling to bulk one <i>J<sub>s</sub>/J<sub>B</sub></i>and the next-nearest coupling to nearest one b and the size of the system are studied. It is found that there exists a multicritical value <i>J<sub>s</sub>/J<sub>B</sub> (J<sub>C</sub>)</i> at which the phase transition temperature <i>T<sub>C</sub></i>at the surface is the same as that in the body. The dependence of <i>J<sub>C</sub></i>on the value of <i>b</i>for different number of surface layers is also studied. The calculated results are well consistent with the experimental facts.

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