  A spin model of LiCu2O2 compound with ground state of ellipsoidal helical
structure has been adopted. Taking into account the interchain coupling and
exchange anisotropy, we focus on the magnetoelectric properties in a rotating
magnetic field and perform the Monte Carlo simulation on a two-dimensional
lattice. A prominent anisotropic response is observed in the magnetization and
polarization curves, qualitatively coinciding with the behaviors that detected
in the experiment. In addition, the influences of the magnetic field with
various magnitudes are also explored and analyzed in detail. As the magnetic
field increases, a much smoother polarization of angle dependence is exhibited,
indicating the strong correlation between the magnetic and ferroelectric
orders.
