Magnetic susceptibility for the t- J model

We present results for the dynamical magnetic susceptibility of the t- J model, calculated with the dynamical mean field theory. For J = 0 we find enhanced ferromagnetic correlations but an otherwise relatively q-independent dynamical magnetic susceptibility. For J > 0 the explicit antiferromagnetic exchange leads to a dynamic spin structure factor with the expected peak at the antiferromagnetic Bragg point.