The finite-frequency transport properties of a large-spin molecule attached
to ferromagnetic contacts are studied theoretically in the Kondo regime. The
focus is on the behavior of the dynamical conductance in the linear response
regime, which is determined by using the numerical renormalization group
method. It is shown that the dynamical conductance depends greatly on the
magnetic configuration of the device and intrinsic parameters of the molecule.
In particular, conductance exhibits characteristic features for frequencies
corresponding to the dipolar and quadrupolar exchange fields resulting from the
presence of spin-dependent tunneling. Moreover, a dynamical spin accumulation
in the molecule, associated with the off-diagonal-in-spin component of the
conductance, is predicted. This spin accumulation becomes enhanced with
increasing the spin polarization of the leads, and it results in a nonmonotonic
dependence of the conductance on frequency, with local maxima occurring for
characteristic energy scales
