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$\require{mediawiki-texvc}$ A theoretical study is presented on the in-planeconductance of graphene that is partially sandwiched by Ni(111) slabs with afinite size and atom-scale width of $\approx12.08 \AA$. In the sandwiched part,the gapped Dirac cone of graphene can be controlled via pseudospin by changingthe magnetic alignment of the Ni(111) slabs. When the magnetic moments of theupper and lower Ni(111) slabs have antiparallel and parallel configurations,the bandgap at the Dirac cone is open and closed, respectively. Thetransmission probability calculation for the in-plane conductance of the systemindicated that the antiparallel configuration would result in nearly zeroconductance of $E-E_F=0.2$ eV. In the parallel configuration, the transmissionprobability calculation indicated that the system would have a profile similarto that of pristine graphene. A comparison of the transmission probabilities ofthe antiparallel and parallel configurations indicated that a highmagnetoresistance of $1450\%$ could be achieved. An ultimate magnetoresistancecan be expected if the Ni(111) slab widths are increased to the nanometerscale.

Ultimate In-plane Magnetoresistance Ratio of Graphene by Controlling the Gapped Dirac Cone through Pseudospin