  The ability to manipulate the relative magnetization alignment between
ferromagnetic source and drain electrodes attached to a molecule or small
quantum dot is a prerequisite for a number of spintronic device applications.
The influence of electrode shape and field orientation on pair-wise
magnetization reversal mechanisms in nanogap and point-contact structures is
investigated here using micromagnetic simulations. A favorable device geometry
and setup are identified for enabling planar, monodomain source and drain
electrodes with a magnetization alignment that may be controllably switched
between a parallel and anti-parallel configuration.
