  Magnetic properties of Hubbard model have been studied extensively. A
theoretical description of these states, however, is not straight forward
within conventional mean-field approach due to the electron correlation
effects. Here we provide a slave spin theory of the magnetic states in the
single band Hubbard model. By introducing an additional decomposition of the
on-site Coulomb interaction in the magnetic channel in both the slave spin and
the fermionic spinon sectors, we show a magnetic solution with renormalized
quasiparticle spectral weight can be stabilized at both half-filling and finite
doping. By comparing the energies of antiferromagnetic and ferromagnetic
states, we provide a ground-state phase diagram for generic electron filling.
We further discuss possible generalization of the slave-spin method.
