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Spin transport characteristics of graphene has been extensively studied sofar. The spin transport along c-axis is however reported by rather limitednumber of papers. We have studied spin transport characteristics throughgraphene along c-axis with permalloy(Py)/graphene(Gr)/Pt by gigahertz (GHz) andterahertz (THz) magnetization dynamics driven by femtosecond laser pulses. Therelatively simple sample structure does not require electrodes on the sample.The graphene layer was prepared by chemical vapor deposition and transferred onPt film. The quality of graphene layer was characterized by Raman microscopy.Time resolved magneto-optical Kerr effect is used to characterize gigahertzmagnetization dynamics. Magnetization precession is clearly observed both forPt/Py and Pt/Gr/Py. The Gilbert damping constant of Pt/Py was 0.015, indicatesspin pumping effect from Py to Pt. The Gilbert damping constant of Pt/Gr/Py isfound to be 0.011, indicates spin injection is blocked by graphene layer. Wehave also performed the measurement of THz emission for Pt/Py and Pt/Gr/Py.While the THz emission is clearly observed for Pt/Py, a strong reduction of THzemission is observed for Pt/Gr/Py. With these two different experiments, andhighly anisotropic resistivity of graphite, we conclude that the vertical spintransport is strongly suppressed by the graphene layer.

Spin injection characteristics of Py/graphene/Pt by gigahertz and terahertz magnetization dynamics driven by femtosecond laser pulse