  Using the Landauer-B\"utikker formalism, we study the graphene
magneto-transport in the presence of Rashba spin-orbit interaction (RSOI). We
show that the angle resolved transmission probability in the proposed
structures can be tuned by the RSOI strength. The transmission spectrum show
Klein tunneling in the parallel (P) magnetization configuration which can be
blocked by the RSOI. This effect is also observable for the anti-parallel (AP)
magnetization configuration in different incident angle. The numerical results
shows that the spin-polarized conductance strongly depends on the strength of
the RSOI and can be generated by tuning the magnetic exchange field and RSOI
strength. This spin-polarized conductance is a sensitive oscillatory function
of the thickness of the RSO region. Because of the spin-flip effect, the
junction shows a spin-valve effect with large and negative magnetoresistance
(MR) and spin-magnetoresistance (SMR) in the presence of RSOI. When the RSOI is
on, the frequency and amplitude of shot-noise and Fano factor's oscillations
are also increased. These results can provide a way to extending the
application of graphene-based junctions in spintronics.
