  A new way of getting controlled spin dependent transport through a
two-terminal bridge setup is explored. The system comprises a magnetic quantum
ring which is directly coupled to a magnetic quantum wire and subjected to an
in-plane electric field perpendicular to the wire. Without directly changing
system parameters, one can regulate spin currents simply by tuning the external
electric field under a finite bias drop across the wire. For some particular
field strengths a high degree of spin polarization can be achieved and thus the
system can essentially be utilized as an externally controlled spin polarized
device. A detailed comparison of spin current magnitudes obtained from other
bridge setups is also examined to make the present investigation a self
contained study.
