  The thermal entanglement of two spin-1 atoms with nonlinear couplings in
optical lattices is investigated in this paper. It is found that the nonlinear
couplings favor the thermal entanglement creating. The dependence of the
thermal entanglement in this system on the linear coupling, the nonlinear
coupling, the magnetic field and temperature is also presented. The results
show that the nonlinear couplings really change the feature of the thermal
entanglement in the system, increasing the nonlinear coupling constant
increases the critical magnetic field and the threshold temperature.
