  The experimental realization of a coupled spin pair has been reported by
Heiko Webber et.al and its theoretical description has been previously
discussed including the condition that local magnetization of the junction is
required for the individual moments to affect the electrons in the molecular
ligand through the Kondo interaction. Here in this work, we show that when the
couple spin pair is placed in an interferometry set up of the Aharonov-Bohm
type additional features related to the switching behavior of the coupled spin
pair emerge. This features lead to a phase dependent exchange magnetic field
coming from the ferromagnets in proximity with the molecule, a phase dependent
commutation of the singlet/triplet ground state around zero bias and it leads
to variations in the voltage dependent effective exchange profile between the
spin pair. These predictions contribute to the acceptance of the hypothesis
that spin polarization can be harvested from quantum coherence in molecular
quantum mechanics
